ONE genuine NIB Marconi DA30 triode tube U.K. made scarce power tube. NOS-testing tube, no gas, shorts, no rattles, firm sockets. Double-cup getters, getter flash excellent. On a friends Amplitrex AT1000 tested: At 500v anode, -150v bias: Gm- 3190 µmohs, Ip= 59.0 mA (Marconis spec: - 30 mA). You only buy what you see in pics. Please note that other tube testers might give different test results. I dont guarantee at all that this tube will test at SAME value as on my friends Amplitex AT1000 tester. Dont bid if you disagree with my statement!

Marconi DA30 / PX25 Triode Valve Amplifier Vintage Woden As found , untested but looks to be in good condition . All valves untested. I will package very well as always.Please see photos for detail Please ask any questions Before buying Postage within UK Via DPD or Parcel force 48 and overseas by GSP Ebay Global shipping program.

This auction is for a rare balloon audio tube type DA30 (same shape of PX25) made by the MO-V Marconi. Military version, good looking tube.This DA30 is in working order and has two filaments glowing out of four, please check pictures.However it has been tested at 60mA with mA/V of 3 grid -65, still a good tube. Immediate payment required for this item! This is due to time-wasters who refuse to pay. If payment is not received within 24 hours I will sell it to second highest bidder without any further warning! Thanks Happy biddingI ship worldwide.UK GBP 8; Europe GBP 16; Asia: Hong Kong Taiwan China South Korea Japan GBP 20 USA GBP 20

1 Marconi DA30 triode tube Made in the U.K. and of vintage production. Excellent, NOS-testing tube. Strong Gm and Ip; meets new-spec. Free from gas or shorts. Listened in circuit- quiet with no noise or microphonics. Clean glass & pins. Hanging filaments. Bottom, cup-getters. Tight base w/ no cracks. Excellent gettering. No large chunks inside. Tested at real operating voltages on an Amplitrex AT1000 at two operating points. Tube operated 10 min ea. before tests to ensure stability. AT1000 test results: At 300v anode, -75v bias- Gm- 4250 µmohs, Ip= 81.6 mA. Spec from Marconi- 45 mA. At 500v anode, -150v bias- Gm- 3190 µmohs, Ip= 59.0 mA. Spec from Marconi- 30 mA. In conclusion- This tests as an excellent, NOS tube. An excellent addition to anyones collection. Money back guarantee you will not be disappointed. All items are 100% guaranteed to arrive as represented for 30 days upon arrival. We offer a full refund if you are not satisfied. Weve been selling vintage electronics since 1999 with perfect ebay feedback and many happy, satisfied customers. All items professionally packed to arrive safely with no extra handling costs. Our mission is to offer quality-tested tubes to make you happy with your purchase. Terms & Conditions: Payment must be received within 3 days of sale date. Items described to the best of my ability. Shipped by U.S. Priority Mail. If you have questions, please contact me BEFORE purchasing. Thank you!

This auction is for a rare balloon audio tube type DA30 (same shape of PX25) made by the MO-V Marconi. Military version, good looking tube.This DA30 is in working order and has two filaments glowing out of four, please check pictures.However it has been tested at 60mA with mA/V of 3 grid -65, still a good tube Happy biddingI ship worldwide.UK GBP 8; Europe GBP 16; Asia: Hong Kong Taiwan China South Korea Japan GBP 20 USA GBP 20