The twin triode sections are closely matched for both emission and transconductance, test results below. Mutual Conductance test on TV-7A/U of 81 & 76 (30 minimum). Mutual Conductance test on B&K 747 of 92 & 93 (65 minimum).
Item Tag: 12BH7A
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NIB BRIMAR /Sylvania 12BH7A Short Black Plate Halo Get Tube 12BH7 Great Britain
12BH7A Short Black Plate, Halo Getter Tube. NIB BRIMAR for Sylvania. made in Great Britain.
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Matched Quad Amperex 12BH7A Audio Tubes TV-7 Tested @ NOS
Nice Quad Matched Set Amperex 12BH7A Audio Tubes. Tubes read @ NOS++, see labels on photos.
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1PC NEW Audio Valve Vacuum Slovakia JJ 12BH7A Gold plated pin
1PC NEW Audio Valve Vacuum Slovakia JJ 12BH7A Gold plated pin Price is for one PC, buy 2pcs, we will send matched pair Thank you!.
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5 Unknown Brand 12BH7A Tubes TV7 Tested Strong See Photos For Details
These tubes have been tested on a TV7 tube tester with all shorts tested. Tested values Minimum value reading for GOOD value on tester Part Number: type 12BH7. For sale is Qty: 5.
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2 x 12BH7A Tubes unknown Brand 1= Made in JAPAN Tested Good Grey Plates O-Getter
Tested Good Grey Plates O-Getter Tested Good See Pictures NOS ?.
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GE NOS 12BH7 12BH7A Ampltrex AT-1000 Matched Pair for McIntosh MC30 MC240 MC275
LIMITED STOCK. ACT QUICKLY. THESE WILL SELL FAST. GE NOS USA 12BH7A MATCHED PAIR CLASSIC USED BY MCINTOSH AND OTHERS IN THE GOLDEN DAYS OF AUDIO This listing is for (2) brand new, old stock factory fresh GE 12BH7A as a matched pair. Tubes are matched for gm on a Amplitrex AT-1000 tester. We tried these in an MC-225 and a pair of MC-30s, and the amplifiers measured better and sounded better. NO SNAKE OIL TREATMENTS HERE. STAY AWAY FROM THAT STUFF UNLESS YOU WANT YOUT TUBE GEAR TO SOUND LIKE 1970s TRANSISTOR GEAR! This is a well constructed 12BH7A, that tests and sounds excellent. They test consistently with very high gm readings. A perfect differential driver tube. This is a requirement for the driver differential amplifier in the McIntosh and other amplifiers. Purchasing a tube without matched sections in these amplifiers is a waste of money and will cause increased distortion. CTech Electronics stands behind all of its products and services. Check our feedback and bid with confidence. We are a full service company offering parts, tubes, equipment and repair/restoration services. We are not just tube resellers like the majority of our competitors. We are fully qualified to service the equipment they are used in and give tecnical help when needed. Please visit our Ebay Store. On Dec-08-09 at 17:08:47 PST, seller added the following information: Note: International Buyers are responsible for all import duties and taxes for the country this item is shipped to. Please consult your customs dept.officials to determine what you will need to pay. CTech Electronics assumes no responsibility for any of these fees. If you cannot pay the fees do not purchase this product as your item will remain in customs and you will not be able to get it out without personally paying the fees.