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Amperex CV492

159.13.220.238

Hi Folks. My first post. I am a guitarist who has also been a professional radio technician. I have used valve amps and preamps for the last 40 years and don't intend changing that at all !!!
I am underway with some valve amp projects, so hoping to learn and share with this forum.

I have some Amperex CV492, 12ax7. These are NOS ( W German) and I'm pretty certain they are ex spares from Broadcasting equipment.
Amperex 12ax7 appear to be well regarded but I really can't find much information on CV492 (variant ?). My research indicates CV is a Military term for "Civilian use"

I'm interested in people's knowledge of this valve.

regards Bob

Follow Ups:

RE: Amperex CV492 - Palustris 08:57:07 06/21/17 (2)
According to Fathauer's book, 'Electron Tube Locator' CV is short for common valve.
- RE: Amperex CV492, I read that as well... - Mechans 14:11:16 06/26/17 (1)
  It is ironic that the "common valve" nomenclature is not used commonly. If it was we wouldn't have to question what a CV 492 is in the first place.
  - RE: Amperex CV492, I read that as well... - Palustris 15:00:54 06/26/17 (0)
    In the USA, the govt. nomenclature for common tube types was VT (vacuum tube) as in VT100 which is the 807. I still can't help thinking about the VT100 DEC terminal, though, every time I see VT100.
RE: Amperex CV492 - FenderLover 06:44:59 06/21/17 (0)
I've used Mullard and Brimar made CV492 tubes. These are good tubes. Mil or industrial spec, I believe.

Long plate... check for microphony. If noise free and tests high --- you have good tubes. Keep them and use them.

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