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Tubes Asylum Questions about tubes and gear that glows. FAQ |
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Tubes Asylum Questions about tubes and gear that glows. FAQ |
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In Reply to: 6ac7,ef91 and VT-91 good for Audio? posted by lthium2 on February 19, 2001 at 10:00:29:
... if you do not have a negative preconception about pentodes.6AC7 is a medium high gm 'low noise' wideband amp pentode - can be used as pentode driver or small signal gain stage - allowing to drive 2A3 or 300B in a similar way than with a C3m - though it will sound different. Single stage RIAA amps are feasible as well.
As for the VT91/6J7, it is a grid cap pentode of high Ri and low gm - not great as driver, but maybe interesting as a 'low noise' phono stage - steel bulb and grid cap will allow for an interesting amp design. With an Ra of 1 MOhms it allows for a single stage gain of 1000 - so it looks as if it was interesting to play with as well in a simple Audion circuit AM receiver...
The EF91 is a small, unexciting RF pentode - try pentode or triode small signal gain stages...
Regards,
---mb---
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- 6AC7 and 6J7/VT91 are interesting... - mb-de 03:28:56 02/20/01 (0)
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