Re: Another tube question

[The Bernadettes <mdestefano@xxxxxxxx>]

John,
    As far as I know the 12DW7 is the only disimilar dual triode that can be
subbed in a 12AX7 and they all have the same pinout.  Before you go re-wire the
amp, double check a schematic of your amp, frequently there is no difference
between mic and instrument channels on some amps.  They're just labeled that way
for marketing purposes.  Fender frequently did this on their tweed amps.

Don D.
http://www.thebernadettes.com

"adams, john" wrote:

> I just received today a 12dw7 tube.  This tube has two dissimilar triodes in
> it.  One has a gain of 100 (same as 12ax7) and the other has a gain of 20
> (same as 12au7).  My amp ( a Silvertone 1472 ) has two channels, one for mic
> and one for instruments.  The low power side is going to be on the
> instruments side, not the mic side.  Now I can either plug my mic into the
> instrument jack, or re-wire the amp.   I use the other channel for guitar,
> so I don't want to reduce the gain on that channel.
>
> My question is, does anyone know if there is a tube that has the low power
> side on the opposite half of the tube?
>
> Thanks
>
> John
>
> http://www1.korksoft.com/~schem/bargainbin/silvertone1472.pdf
>
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