Two RCA 6211 vacuum tubes.Tubes are different in construction Tested with a calibrated TV-7D/U tube tester. Calibration by Daniel Nelson. Code: N/A NOS/Used: usedConstruction: black plate three mica gray plate round getterGlass: clear no burn marks Base: N/ATested at: 23/25 25/24 GMMinimum: 18/18 GMThe minimum is equal to 65% of the life of the tube. Tested for shorts and gas. 30-day free return. Your items will be packed very well and shipped promptly.We combine shipping on tubes.Always glad to answer any questions.Thanks for looking!

IBM RCA 6211 TUBES SQUARE GETTER 50S GM- TESTED

IBM RCA 6211 TUBES SQUARE GETTER 50S GM- TESTED

IBM RCA 6211 TUBES SQUARE GETTER 50S GM- TESTED

IBM RCA 6211 TUBES SQUARE GETTER 50S GM- TESTED

IBM RCA 6211 TUBES SQUARE GETTER 50S GM- TESTED

Four RCA Red Label 6211 Tubes. All four have a gain over 16 times and plate current is very close on all four indicated by the grid bias across the 5 k cathode resistor. Data was collected using the circuit shown.

RCA 6211 (12AT7) Tubes (Pair) - TESTS NOSBlack Box Plates - Triple MicaLow Noise Audiophile TubesTriple Platinum Matched on AT1000 These 6211 tubes are known for their low noise. Completely compatible with any unit using a 12AT7. Try these and you will immediately notice a smoothness to the sound with less of an edge. Amplitrex AT1000 Test Results (GM) Mutual Conductance 3600 = Spec (EM) Emission 2.1 gV = Spec Noise Test (Mu) Gain TUBE #1 3600/3600 (100.0/100.0%) 2.2/2.2 (104.8/104.8%) 5/5 27.0 27.3 TUBE #2 3630/3600 (100.8/100.0%) 2.2/2.1 (104.8/100.0%) 5/5 27.0 27.8 TUBE #3 N/A N/A N/A TUBE #4 N/A N/A N/A PERFECT = 0.0% (GM 5% or Less = Outstanding)Balance (Balance Goal = Mhos < 5% / Gv < 10%)Tube 1: A to B = Mhos - 0.0% Gv - 0.0%Tube 2: A to B = Mhos - 0.0% Gv - 4.8%Match (Tube 1 to Tube 2) (Match Goal = Mhos < 5% / Gv < 10%)Tube 1A to 2A = Mhos - 0.8% Gv - 0.0%Tube 1B to 2B = Mhos - 0.0% Gv - 4.8%Microphonics Test Scale: 5 = Ultra Low; 4 = Very Very Low; 3 Very LowBULLz TUBEz About BULLzTUBEz:Ive been an Audiophile for over 50 years, 2 time National Champion in Car Audio and owned a chain of Car Stereo Stores... I have a massive collection of vacuum tubes specializing in mostly esoteric tubes but we have just about any tube you need. Just check the store for the listed inventory. If you have a request just send a message to NOVA.76 through the eBay messaging system... I stand behind everything I sell... My goal is to Create a Positive Experience for my customers...About My TUBEz:All tubes are tested with the Audiophile in mind for SHORTS, GAS, MUTUAL CONDUCTANCE, EMISSION and NOISE (large tube lots are not tested for noise). All my tubes are tested thoroughly on an Amplitrex AT1000... My backup tube testers are an AVO MKIV and another Amplitrex AT1000... I WILL NOT GUARANTEE THAT MY READINGS WILL MATCH YOUR READINGS... Variations in Line Voltage and Test Equipment excludes any claims regarding matching test results on any equipment other than mine...Warranties:Used or vintage items are sold as is with no warranty beyond the description and photographs provided on the listing. Returns will NOT be accepted for reasons such as: dont like the sound, ordered the wrong item, changed mind, not what I thought it was, wrong color ordered, wrong item ordered or tube readings dont match my tester. Any exceptions are on a case by case basis and subject to a 15% restocking fee... Shipping:Domestic Shipping to the continental United States will be by the US Postal Service (USPS) including free tracking. Some items listed will ship free and will be clearly listed as free Shipping. Items not listed as free shipping will be for the cost of packaging plus shipping only, no extra charge will be added to the USPS fee. INTERNATIONAL BUYERS PLEASE CHECK THE SHIPPING CHARGES PRIOR TO BIDDINGInternational Shipping will be offered for select items and will be clearly identified in the listings Shipping & Payment tab. Shipping will be by the eBay International Standard Shipping and be made available as a shipping option at check-out. Shipping costs to international locations will be paid by the buyer. The shipping and handling cost will be clearly identified at check-out. THERE ARE NO RETURNS ON INTERNATIONAL SHIPPING, apart from the exceptions as dictated by eBay... Please note the following:Import duties, taxes and charges are not included in the item price or shipping charges. These charges are solely the buyer?s responsibility.Please check with your country?s customs office to determine what these additional costs will be prior to bidding/buying.These charges are normally collected by the delivering freight (shipping) company or when you pick the item up ? do not confuse them for additional shipping charges.We do not mark merchandise values below value or mark items as ?gifts? - US and International government regulations prohibit such behavior.

Rare RCA 4C21, exactly the same as 211. Tested on Amplitrex AT1000. Test: 127mA New value is 100mA See our other auctions for many more tube lots.

For sale is this lot of 8 type 6211 vacuum tubes, test close and in the NOS new range on our calibrated Jackson 648A tester.its possible they might have light shop use.6211 has same pinout and heater voltage and current as 12AU7(gain 20), 12AY7(gain 40), but has gain 27. they all have the same plate structure shape, look like 5687 plates, but these are 6211s, some rebranded (not all marked RCA),but the shape of the plate on all looks the same, and all test close and balanced in the new range.