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RE: Solid state 12ax7

Posted by TubeAcolyte (D) on February 18, 2014 at 11:49:20

In Reply to: RE: Solid state 12ax7 posted by SETdude on February 18, 2014 at 08:13:22:

There's someone who built a radio with Fetrons (linked below). From what I can see in the manual provided in the ebay ad and by other reports, they're not exactly drop in compatible spec-wise. Their amplification factors for AX7, AT7, BH7 and AU7 type subs are way off (150, 1500, 21000 are numbers I find lol), and depending on the circuit/application they may be entirely incompatible (regardless of how they're advertised). Fetrons were, AFAICT, a huge flop.

http://www.ko4bb.com/Manuals/09%29_Misc_Test_Equipment/FETRON_Solid_State_Vacuum_Tube_Replacement.pdf

But, thinking on it, the AMT products may be different. Fetrons drew no heater current whatsoever (not connected). The AMT ss-tube does (same 15ma as a regular 12AX7), and at least the characteristics are advertised to be the same. So, what's the deal behind these, I don't know...

Someone buy one and break it!
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May your tubes be lively, warm, and long-lasting. Holy be thy heater.

• http://www.philipstorr.id.au/radio/eleven/fetron.htm   (Open in New Window)

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