Vintage Matshushita 12BH7A Tube Tested on a Hickok 6000A: Micromhos ; Nominal Nos = 2380/2380 Minimum = 1430/1430 Results =3210/3050 USA Shipping $6 I have many other types of tubes ~ No Additional Shipping Charges All tubes are Guaranteed 156~~~~ Please click on the link below to view more items in my store. ~~~~~~~~ GreenGirls Guaranteed VintageTubes

20pcs 6N5P (6AU7 12AU7 12BH7) SOVIET DOUBLE TRIODE TUBES / BLACK BOX ANODE / - Extra RARE - / /// BIG LOGO /// / NOS - TESTED* INTERNATIONAL SHIPPING FOR MINIMAL COST OUR GOAL IS TO BE BEST IN THIS BUSINESS FOR TUBES BEST PRICES !!!

2pcs 6N5P (6?5? 6AU7 12AU7 12BH7) SOVIET DOUBLE TRIODE TUBES / BLACK BOX ANODE / - RARE - / SAME DATE 64s / M.PAIR / NOS TESTED* INTERNATIONAL SHIPPING FOR MINIMAL COST OUR GOAL IS TO BE BEST IN THIS BUSINESS FOR TUBES BEST PRICES !!!

  TUBE HUNTER VACUUM TUBE GEMS THESE ARE THE SPECIFICS OF THE TUBE/TUBES FOR SALE THESE ARE THE TUBE/TUBES FOR SALE:    MANUFACTURER:                              GE PRODUCTION CITY:                                    NEW JERSEY TUBE TYPE:   12BH7 A DESIGNATION:                                             MIL SPEC YEAR:   1954 MONTH or WEEK     48 DATE CODE MATCH?    SINGLE SILK SCREEN CONDITION %:                    100% MICA:   2 PLATES:     GREY CURVE TRACER ma:                    11.5ma AND 12.5ma AT 250PV AND -10G TRANSCONDUCTANCE: NORMAL= 2200   3100µmhos AND 3150µmhos PERCENTAGE OF BOGEY:              100% AND 101% SINGLE/PAIR/QUAD/MULTI:   SINGLE GETTER:                                                          FAT D GETTER DATE CODE                                                    4 48 This is a  GE 12BH7 . This type of tube is consistently rated by audiophile at the top of the heap. They are definitely very sweet sounding. Most surveys put them in the top three of ALL TUBES! Very strong and well balanced and well matched!   Most audiophiles say these d getter long black plates are the pinnacle of listening pleasure. I LOVE THEM. They deliver the bass like no other, and the mids are supremely hollow and detailed. Highs are akin to a good Telefunken. I really recommend these tubes. Normal 0 false false false EN-US X-NONE X-NONE On my tester a B&K 747 tester:    Below 55 = BAD      55-66 = ?     65 -100 = Good     100-120+ = NOS          I want to see you happy with your purchase. I will never sell a tube that is below standard…… I have sold many tubes here on Ebay, and all my customers have been completely satisfied. I will work with you in good faith if there are any problems, or if you are unsatisfied in any way. I want your business now and in the future, so I assume you are the boss, and I am the employee. All tubes are tested for shorts, continuity, and emissions. I prefer PayPal. ALL CUSTOMERS PLEASE READ ALL NOTES BEFORE BUYING FROM ME !! 1.  RETURNS: It is my highest desire that you are completely satisfied with your purchase from me. I will bend over backwards to make sure that you are a happy customer. If anything you buy from me is less than satisfactory, message me BEFORE you either open a case or hit the “item not as described” button. Sound quality is tremendously SUBJECTIVE. For tubes returned for noise or sound quality of any kind you pay for the shipping we refund the purchase. We refund the price of the item NOT THE SHIPPING COST. If we sent the wrong tube we will of course pay for return shipping. For any tubes that are DOA we require that you send a us a picture of the shipping box to show us the damage. We test EVERY tube sent out and none should be DOA unless broken in shipping. 2.    PLEASE NOTE:  Tube silkscreen (lettering on the tubes) is VERY fragile. It can be wiped off and destroyed VERY easily. If you wipe off the silkscreen while handling the tube you diminish their value by up to 70%. DO NOT handle the tubes or hold them from the cylinder. ALWAYS hold them from the ENDS. If you are returning tubes and they are not in the same condition cosmetically I cannot give you a full refund. THIS IS VERY IMPORTANT. 3.  UNLESS YOU MAKE ARRANGEMENTS WITH US BEFORE YOU PURCHASE, YOU MUST PAY FOR ITEMS PURCHASED WITHIN 2 DAYS OR A CASE WILL BE OPENED FOR AN UNPAID ITEM!!! 4. TESTING: I test all tubes that I sell in one way or another, or I will state untested. I have a B&K 747 tube tester. This is a mutual conductance tester. It give a percentage value of gm for the tube under test and checks for shorts and grid emissions. I also use a Tektronix curve tracer for testing triodes. I give a number of evaluations for tubes. One evaluation is a screen shot of the tube with a high voltage applied to the plate. This helps the buyer see the linearity of the tube in question at the highest voltage the tube will see in a real circuit. The Curve tracer steps the triode through 10 gate/grid voltages starting with -10 volts and going to 0 volts. The lines show how the tube conducts throughout that range. At 0 volt the tube is at max conduction and is the top line on the display. It is easy at that point to take where that top line intersects the plate voltage, find the milliamp level and compare it to the datasheet. I give those numbers for you in the Item condition box. To further help the buyer I also include the Design values, for gm and ma readings in the table. This can then be compared to other tube sellers using inferior test methods such as Hickok,  Amplitrex, and other testers. The Tektronix curve tracer gives values within 3% of the actual value. The very best portable testers only can approach 10% accuracy.5.    Please note: The numbers given for gm are what I see on my tester. I DO NOT guarantee that you will see those numbers on your tester. I only guarantee that these tubes will test good, with no shorts, or gas, on a decent calibrated tester. I dont guarantee or imply anything else. 6. VERY IMPORTANT!!! Vintage tube testers almost always, due to age, have VERY LOW HEATER VOLTAGES!!!  Every tester I have ever bought is below 6 volts when selecting 6.3 volts. They average 5.8 volts. The voltage NEEDS to be 6.3 and 12.6. You can calibrate a vintage tube tester all you want. If the heater voltage is not right, you will NEVER get the right gm value. I have customers complain that their tubes are not the same as what I see on my tester. They say they have a calibrated tube tester. I have 40 tube testers. On all of them I have an outside regulated DC power supply that feeds the tube tester the correct heater voltage. 7. I dont check each and every tube for noise or tone. This is SUBJECTIVE and it is too time consuming. If you dont like the noise level or the tone we offer a hassle free refund policy.  International customers note: 1. Please wait for us to invoice you for the correct amount. If you have purchased more than one item, we must calculate how much the shipping will be. Shipping will be HIGHER due to insurance and shipping methods needed for expensive item totals. If you are buying only one item this will not be an issue. 2. Under no circumstances will we state on a US customs a declared value of less than the sale price. This is an honesty issue. We are honest with everyone to the best of our ability to do so. We want you to trust that what we say is true. There cannot be that trust, if we make false statements knowingly to anyone. If your country has tariffs/taxes so high that they cause large numbers of normally honest folks to make false statements, we urge you to work for change of those laws. 3 International buyers if you bought more than one item and want combined shipping it will ship in 2 days. 4. And all the Angels sang because the heavenly music was playing and it was turned all the way up.   Listing and template services provided by inkFrog

GE 12BH7 Black Plate Vacuum Tube ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ Tested on an enhanced Triplet E3444 Laboratory Tester prepared by Paul Hart of Roswell, GA Industry Bogey transconductance =3100|3100µmhos Industry Bogey plate current =11.5|11.5mA Results =2200|2450µmhos ~ 8.8|8.2mA The measurements in this listing were taken on a Triplett 3444 modified to test the tube as an amplifier in accordance with RMA/EIA specifications, utilized by all US and most foreign tube manufacturers. This tester applies test conditions for this tube (including the precise filament voltage) and then measures transconductance (gm) in accordance with the engineering definition of gm. Tubes may also be operated under the test conditions for extended periods to be sure that it is stable. A tube must be tested in this manner to compare its test results with the manufacturer’s original intent or with other tubes of the same type. Most tube testers do not apply the test conditions required or conduct a valid gm test. For more details on the test and our test equipment, please contact us. ????????????????????????????????USA Shipping $6 ~ Higher OverseasI have many other types of tubes ~ Just Search MY store No Additional Shipping Charges ***All tubes Guaranteed ?????? Thank You! ?????? ~~~~ Please click on the link below to view more items in my store. ~~~~~~~~ GreenGirls Guaranteed VintageTubes32B

12BH7 Black Plate Vacuum Tube ????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????

I have 1 Excellent strong Tungsol black plate 12bh7a tube with the O getter.

I have 1 Excellent Rare strong rca black plate 12bh7a tube with the highly sought after small dimple D getter.

I have 1 Excellent very strong Rca black plate 12bh7a tube with the highly sought after awesome sounding small dimple D getter

I have 1 Excellent new in the box Sylvania 12bh7a tube.

5 VALVOLE 12BH7 MADE BY FIVRE. O GETTER. Testedon AVO CT160. Test Condition: Vf = 6,3V Va = 250V Vg1 = - 10,5V - Tube1: EMISSIONE: 10,5mA (new:11,5) Transcoduttanza: 2,8 mA/V (new:3,1) EMISSIONE: 10,5 mA (new:11,5) Transcoduttanza: 2,8 mA/V (new:3,1) Tube2: EMISSIONE: 11,5mA (new:11,5) Transcoduttanza: 3,1 mA/V (new:3,1) EMISSIONE: 11,5 mA (new:11,5) Transcoduttanza: 3,1 mA/V (new:3,1) Tube3: EMISSIONE: 6 mA (new:11,5) Transcoduttanza: 1,2 mA/V (new:3,1) EMISSIONE: 7 mA (new:11,5) Transcoduttanza: 1,5 mA/V (new:3,1) Tube4: EMISSIONE: 11mA (new:11,5) Transcoduttanza: 3 mA/V (new:3,1) EMISSIONE: 10,5 mA (new:11,5) Transcoduttanza: 3 mA/V (new:3,1) Tube5: EMISSIONE: 12mA (new:11,5) Transcoduttanza: 3,1 mA/V (new:3,1) EMISSIONE: 13 mA (new:11,5) Transcoduttanza: 3,1 mA/V (new:3,1)

Vintage Sylvania 12BH7 BP Stereo Tube~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~***** Tested on our proprietary tester , the E3444 Triplett/Westmore 501 : Its a Triplett 3444 / Westmore 501 that has been enhanced. This tester uses regulated power sources for the bias, plate, & screen voltages, as well as modified operating & testing procedures. Filament voltage is also controlled. Tubes are tested in accordance with the manufacturers specifications; measurements closely align with a laboratory tester built to rigorously measure vacuum tube characteristics. Tubes can be accurately matched for gm & plate current at the manufacturers specified test points or at other specified test points. ***** This tester was prepared by Mr. Paul Hart of Falls Church , Virginia. ***** ********************************************************************* Industry Bogey transconductance = 3100/3100 µmhos & Industry Bogey plate current = 11.5/11.5 mA Results = 2500/2850 µmhos ~ 7.5/9.2 mA Usa Shipping $6 I have many other types of tubes ~ No Additional Shipping Charges All tubes Guaranteed Big Ben ~~~~ Please click on the link below to view more items in my store. ~~~~~~~~ GreenGirls Guaranteed VintageTubes

Westinghouse 12BH7 Black Plates Vacuum Tube <><><><><><><><><><><><><><><><><><><><><><><><><><><><><><><><><><><><><><><> Tested on an enhanced Triplet E3444 Laboratory Tester prepared by Paul Hart of Roswell, GA Industry Bogey transconductance =3100|3100µmhos Industry Bogey plate current = 11.5|11.5mA Results =1700|1900µmhos ~5.9|6.1mA The measurements in this listing were taken on a Triplett 3444 modified to test the tube as an amplifier in accordance with RMA/EIA specifications, utilized by all US and most foreign tube manufacturers. This tester applies test conditions for this tube (including the precise filament voltage) and then measures transconductance (gm) in accordance with the engineering definition of gm. Tubes may also be operated under the test conditions for extended periods to be sure that it is stable. A tube must be tested in this manner to compare its test results with the manufacturer’s original intent or with other tubes of the same type. Most tube testers do not apply the test conditions required or conduct a valid gm test. For more details on the test and our test equipment, please contact us~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ USA Shipping $6 ~ Higher Overseas I have many other types of tubes ~ Just Search MY store No Additional Shipping Charges *** All tubes Guaranteed ?????? Thank You! ?????? ~~~~ Please click on the link below to view more items in my store. ~~~~~~~~ GreenGirls Guaranteed VintageTubes 121

RARE Sylvania Smoked 12BH7 Vacuum Tube 1952 Strong Balanced ????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????Tested on an enhanced Triplet E3444 Laboratory Tester prepared by Paul Hart of Roswell, GA Industry Bogey transconductance =3100|3100µmhos Industry Bogey plate current =11.5|11.5mA Results =2550|2650µmhos ~8.8|9.1mA The measurements in this listing were taken on a Triplett 3444 modified to test the tube as an amplifier in accordance with RMA/EIA specifications, utilized by all US and most foreign tube manufacturers. This tester applies test conditions for this tube (including the precise filament voltage) and then measures transconductance (gm) in accordance with the engineering definition of gm. Tubes may also be operated under the test conditions for extended periods to be sure that it is stable. A tube must be tested in this manner to compare its test results with the manufacturer’s original intent or with other tubes of the same type. Most tube testers do not apply the test conditions required or conduct a valid gm test. For more details on the test and our test equipment, please contact us. USA Shipping $6I have many other types of tubes ~ No Additional Shipping ChargesAll tubes Guaranteed ?????? Thank You! ?????? ~~~~ Please click on the link below to view more items in my store. ~~~~~~~~ GreenGirls Guaranteed VintageTubesAB

I have 1 Excellent very strong new in the box Tungsol black plate 12bh7a tube with the O getter.

GE 12BH7 A Vacuum Tube Strong & Balanced ???????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????? **** Tested on our proprietary tester , the E3444. Its a Triplett 3444 that has been enhanced. This tester uses regulated power sources for the bias, plate, & screen voltages, as well as modified operating & testing procedures. Filament voltage is also controlled. Tubes are tested in accordance with the manufacturers specifications; measurements closely align with a laboratory tester built to rigorously measure vacuum tube characteristics. Tubes can be accurately matched for gm & plate current at the manufacturers specified test points or at other specified test points. ***** This tester was prepared by Mr. Paul Hart of Roswell, GA ********************************************************************* Industry Bogey transconductance =3100|3100 µmhos Industry Bogey plate current =11.5|11.5mA Results = 2810|2750µmhos ~10.6|9.3mA ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ USA Shipping $6I have many other types of tubes No Additional Shipping Charges ~~ I will combine all Auctions purchased All tubes Guaranteed ?????? Thank You! ?????? ~~~~ Please click on the link below to view more items in my store. ~~~~~~~~ GreenGirls Guaranteed VintageTubes803

GE 12BH7 A Vacuum Tube Strong & Balanced ???????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????? **** Tested on our proprietary tester , the E3444. Its a Triplett 3444 that has been enhanced. This tester uses regulated power sources for the bias, plate, & screen voltages, as well as modified operating & testing procedures. Filament voltage is also controlled. Tubes are tested in accordance with the manufacturers specifications; measurements closely align with a laboratory tester built to rigorously measure vacuum tube characteristics. Tubes can be accurately matched for gm & plate current at the manufacturers specified test points or at other specified test points. ***** This tester was prepared by Mr. Paul Hart of Roswell, GA ********************************************************************* Industry Bogey transconductance =3100|3100 µmhos Industry Bogey plate current =11.5|11.5mA Results = 2810|2750µmhos ~10.6|9.3mA ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ USA Shipping $6I have many other types of tubes No Additional Shipping Charges ~~ I will combine all Auctions purchased All tubes Guaranteed ?????? Thank You! ?????? ~~~~ Please click on the link below to view more items in my store. ~~~~~~~~ GreenGirls Guaranteed VintageTubes803

  TUBE HUNTER VACUUM TUBE GEMS THESE ARE THE SPECIFICS OF THE TUBE/TUBES/PARTS FOR SALE THESE ARE THE TUBE/TUBES/PARTS FOR SALE:  MANUFACTURER:                             RCA PRODUCTION CITY:                                   HARRISON TUBE TYPE:  12BH7 DESIGNATION:                                              HIGH FIDELITY YEAR:  1970s MONTH OR WEEK DATE CODE MATCH (YES, NO OR SEP):   SINGLE PAINT CONDITION % (SUBJECTIVE):    100% PERCENTAGE OF BOGEY:   104% and 114% PLATES:   LONG GREY SINGLE/PAIR/QUAD/MULTI:   SINGLE GETTER:                                                         O DATE CODE                                                   CX A LITTLE BIT OF HEAVEN! This is an  RCA 12BH7 A . This type of tube is consistently rated by audiophile at the top of the heap. They are definitely very sweet sounding. Most surveys put them in the top three of ALL TUBES! Very strong and well balanced and well matched!   Most audiophiles say these d getter long black plates are the pinnacle of listening pleasure. I LOVE THEM. They deliver the bass like no other, and the mids are supremely hollow and detailed. Highs are akin to a good Telefunken. I really recommend these tubes. Normal 0 false false false EN-US X-NONE X-NONE On my tester a B&K 747 tester:    Below 55 = BAD      55-66 = ?     65 -100 = Good     100-120+ = NOS          I want to see you happy with your purchase. I will never sell a tube that is below standard…… I have sold many tubes here on Ebay, and all my customers have been completely satisfied. I will work with you in good faith if there are any problems, or if you are unsatisfied in any way. I want your business now and in the future, so I assume you are the boss, and I am the employee. All tubes are tested for shorts, continuity, and emissions. I prefer PayPal. ALL CUSTOMERS PLEASE READ ALL NOTES BEFORE BUYING FROM ME !! 1.  RETURNS: It is my highest desire that you are completely satisfied with your purchase from me. I will bend over backwards to make sure that you are a happy customer. If anything you buy from me is less than satisfactory, message me BEFORE you either open a case or hit the “item not as described” button. Sound quality is tremendously SUBJECTIVE. For tubes returned for noise or sound quality of any kind you pay for the shipping we refund the purchase. We refund the price of the item NOT THE SHIPPING COST. If we sent the wrong tube we will of course pay for return shipping. For any tubes that are DOA we require that you send a us a picture of the shipping box to show us the damage. We test EVERY tube sent out and none should be DOA unless broken in shipping. 2.    PLEASE NOTE:  Tube silkscreen (lettering on the tubes) is VERY fragile. It can be wiped off and destroyed VERY easily. If you wipe off the silkscreen while handling the tube you diminish their value by up to 70%. DO NOT handle the tubes or hold them from the cylinder. ALWAYS hold them from the ENDS. If you are returning tubes and they are not in the same condition cosmetically I cannot give you a full refund. THIS IS VERY IMPORTANT. 3.  UNLESS YOU MAKE ARRANGEMENTS WITH US BEFORE YOU PURCHASE, YOU MUST PAY FOR ITEMS PURCHASED WITHIN 2 DAYS OR A CASE WILL BE OPENED FOR AN UNPAID ITEM!!! 4. TESTING: I test all tubes that I sell in one way or another, or I will state untested. I have a B&K 747 tube tester. This is a mutual conductance tester. It give a percentage value of gm for the tube under test and checks for shorts and grid emissions. I also use a Tektronix curve tracer for testing triodes. I give a number of evaluations for tubes. One evaluation is a screen shot of the tube with a high voltage applied to the plate. This helps the buyer see the linearity of the tube in question at the highest voltage the tube will see in a real circuit. The Curve tracer steps the triode through 10 gate/grid voltages starting with -10 volts and going to 0 volts. The lines show how the tube conducts throughout that range. At 0 volt the tube is at max conduction and is the top line on the display. It is easy at that point to take where that top line intersects the plate voltage, find the milliamp level and compare it to the datasheet. I give those numbers for you in the Item condition box. To further help the buyer I also include the Design values, for gm and ma readings in the table. This can then be compared to other tube sellers using inferior test methods such as Hickok,  Amplitrex, and other testers. The Tektronix curve tracer gives values within 3% of the actual value. The very best portable testers only can approach 10% accuracy.5.    Please note: The numbers given for gm are what I see on my tester. I DO NOT guarantee that you will see those numbers on your tester. I only guarantee that these tubes will test good, with no shorts, or gas, on a decent calibrated tester. I dont guarantee or imply anything else. 6. VERY IMPORTANT!!! Vintage tube testers almost always, due to age, have VERY LOW HEATER VOLTAGES!!!  Every tester I have ever bought is below 6 volts when selecting 6.3 volts. They average 5.8 volts. The voltage NEEDS to be 6.3 and 12.6. You can calibrate a vintage tube tester all you want. If the heater voltage is not right, you will NEVER get the right gm value. I have customers complain that their tubes are not the same as what I see on my tester. They say they have a calibrated tube tester. I have 40 tube testers. On all of them I have an outside regulated DC power supply that feeds the tube tester the correct heater voltage. 7. I dont check each and every tube for noise or tone. This is SUBJECTIVE and it is too time consuming. If you dont like the noise level or the tone we offer a hassle free refund policy.  International customers note: 1. Please wait for us to invoice you for the correct amount. If you have purchased more than one item, we must calculate how much the shipping will be. Shipping will be HIGHER due to insurance and shipping methods needed for expensive item totals. If you are buying only one item this will not be an issue. 2. Under no circumstances will we state on a US customs a declared value of less than the sale price. This is an honesty issue. We are honest with everyone to the best of our ability to do so. We want you to trust that what we say is true. There cannot be that trust, if we make false statements knowingly to anyone. If your country has tariffs/taxes so high that they cause large numbers of normally honest folks to make false statements, we urge you to work for change of those laws. 3 International buyers if you bought more than one item and want combined shipping it will ship in 2 days. 4. And all the Angels sang because the heavenly music was playing and it was turned all the way up.   Listing and template services provided by inkFrog

Rad Tel 12BH7 D-Getter Vacuum Tube Matched 1963^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^

Sylvania 12BH7 Black Points Vacuum Tube ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ ***** Tested on our proprietary tester , the E3444 Triplett/Westmore 501 : Its a Triplett 3444 / Westmore 501 that has been enhanced. This tester uses regulated power sources for the bias, plate, & screen voltages, as well as modified operating & testing procedures. Filament voltage is also controlled. Tubes are tested in accordance with the manufacturers specifications; measurements closely align with a laboratory tester built to rigorously measure vacuum tube characteristics. Tubes can be accurately matched for gm & plate current at the manufacturers specified test points or at other specified test points. ***** This tester was prepared by Mr. Paul Hart of Roswell, GA ***** ********************************************************************* Industry Bogey transconductance = 3100/3100 µmhos & Industry Bogey plate current = 11.5/11.5mA Results = 2650/2300 µmhos ~ 8.2/8.4mA ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ USA Shipping $6I have many other types of tubes No Additional Shipping Charges ~~ I will combine all Auctions purchased All tubes Guaranteed Thank you 9J216 ~~~~ Please click on the link below to view more items in my store. ~~~~~~~~ GreenGirls Guaranteed VintageTubes

Vintage 12BH7 USA Blackplates Tube Tested on a Hickok 6000A: Nominal Nos = 2380/2380 Minimum= 1430/1430 Results = 2420/2180 Unlimited combined Shipping USA $6 All tubes are Guaranteed #71 ~~~~ Please click on the link below to view more items in my store. ~~~~~~~~ GreenGirls Guaranteed VintageTubes

Raytheon 12BH7 Black Plate Vacuum Tube ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^Tested on an enhanced Triplet E3444 Laboratory Tester prepared by Paul Hart of Roswell, GA Industry Bogey transconductance =3100|3100µmhos Industry Bogey plate current = 11.5|11.5mA Results =2430|2390µmhos ~7.2|7.1mA The measurements in this listing were taken on a Triplett 3444 modified to test the tube as an amplifier in accordance with RMA/EIA specifications, utilized by all US and most foreign tube manufacturers. This tester applies test conditions for this tube (including the precise filament voltage) and then measures transconductance (gm) in accordance with the engineering definition of gm. Tubes may also be operated under the test conditions for extended periods to be sure that it is stable. A tube must be tested in this manner to compare its test results with the manufacturer’s original intent or with other tubes of the same type. Most tube testers do not apply the test conditions required or conduct a valid gm test. For more details on the test and our test equipment, please contact us. ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ USA Shipping $6I have many other types of tubes ~ No Additional Shipping ChargesAll tubes GuaranteedThank you ~~~~ Please click on the link below to view more items in my store. ~~~~~~~~ GreenGirls Guaranteed VintageTubes 7

Sylvania 12BH7 Black Plates Vacuum Tube ********************************************************************* ***** Tested on our proprietary tester , the E3444 Triplett/Westmore 501 : Its a Triplett 3444 / Westmore 501 that has been enhanced. This tester uses regulated power sources for the bias, plate, & screen voltages, as well as modified operating & testing procedures. Filament voltage is also controlled. Tubes are tested in accordance with the manufacturers specifications; measurements closely align with a laboratory tester built to rigorously measure vacuum tube characteristics. Tubes can be accurately matched for gm & plate current at the manufacturers specified test points or at other specified test points. ***** This tester was prepared by Mr. Paul Hart of Falls Church , Virginia. ***** ********************************************************************* Industry Bogey transconductance = 3100/3100 µmhos Industry Bogey plate current = 11.5/11.5mA Results = Pictured Shipping $6 USA I have many other types of tubes No Additional Shipping Charges All tubes r Guaranteed ov2 ~~~~ Please click on the link below to view more items in my store. ~~~~~~~~ GreenGirls Guaranteed VintageTubes

2 x 12BH7 Sylvania Tubes Made in USA Black Plates 1953 codes The lettering is smudged/worn Tested on Enhanced Triplett E3444 Laboratory tester prepared by Paul Hart of Roswell Ga. Results = 3100/2700 micromhos @ 14.3 / 8.1 mA 2950/3150 micromhos @ 9.8 / 11.2 mA Bogey(100% or New) = 3100/3100 micromhos @ 11.5/11.5 mA +/- 10% The measurements in this listing were taken on a Triplett 3444 modified to test the tube as an amplifier in accordance with RMA/EIA specifications, utilized by all US and most foreign tube manufacturers. This tester applies test conditions for this tube as shown below (including the precise filament voltage) and then measures transconductance (gm) in accordance with the engineering definition of gm. Tubes may also be operated under the test conditions for extended periods to be sure that it is stable. A tube must be tested in this manner to compare its test results with the manufacturer’s original intent or with other tubes of the same type. Most tube testers do not apply the test conditions required or conduct a valid gm test. For more details on the test and our test equipment, please contact us.The test conditions for this listing are__250_Volts plate, __250_Volts screen, ___-10.5___Volts bias or Cathode resistance*What were your tubes tested at? I do combine shipping