RE: 5751 always safe instead of 12AX7?

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Questions about tubes and gear that glows. FAQ

Posted by Palustris (A) on May 21, 2016 at 11:18:21

In Reply to: RE: 5751 always safe instead of 12AX7? posted by MP53 on May 21, 2016 at 10:29:48:

Exactly: you can't replace a 12AX7 in any phono stage with a 5751 because the plate resistance, transconductance and mu are all different between the two tubes. The plate resistance of the tube in a phono stage is part of the computation to define the equalization curves. If you change the plate resistance, you change the slope of the equalization curve. It might not be enough of a change to affect your listening experience, but when you have the phonostage engineers guaranteeing an RIAA accuracy to .5dB, it seems fatuous to destroy that accuracy by using the wrong tube.

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Follow Ups Full Thread

Topic - 5751 always safe instead of 12AX7? - ggking7 16:58:19 04/13/16 (12)

RE: 5751 always safe instead of 12AX7? - MP53 10:29:48 05/21/16 (1)

RE: 5751 always safe instead of 12AX7? - Palustris 11:18:21 05/21/16 (0)

RE: 5751 always safe instead of 12AX7? - tvr2500m 10:23:36 04/14/16 (0)

RE: 5751 always safe instead of 12AX7? - Blackdog 17:05:10 04/13/16 (8)

RE: 5751 always safe instead of 12AX7? - hsuha 00:30:46 04/22/16 (0)

RE: 5751 always safe instead of 12AX7? - Mechans 17:27:27 04/13/16 (6)

RE: "it may ruin your sound"... - Ivan303 09:27:33 04/14/16 (5)

RE: "it may ruin your sound"... - Palustris 11:25:55 05/21/16 (0)

RE: "it may ruin your sound".. Yes Ruin is a bit much.. - Mechans 15:11:41 04/14/16 (3)

RE: "it may ruin your sound".. Yes Ruin is a bit much.. - gfxmla@gmail.com 20:52:30 05/18/16 (0)

I'm not much of a fan of crappy little 9 pin tubes... - Ivan303 19:51:59 04/14/16 (1)

RE: I'm not much of a fan of crappy little 9 pin tubes... - ivan_terrible 02:00:08 04/16/16 (0)

Follow Ups

RE: 5751 always safe instead of 12AX7? - Palustris 11:18:21 05/21/16 (0)

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