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Here's my $.02 on your tank issues:
The 5751 tube has a bit more gain than a 12AT7 (the 5751 has about
70% of the gain of a 12AX7, while the 12AT7 has about 60% of the
gain of a 12AX7), so you may want to try a 12AT7 to reduce some of
the harshness.
The 7025 tube was a low noise version of the 12AX7 - I don't think
they're really in commercial production now (although Sovtek may
have such a model). Any 12AX7 should work fine in the tank. I think
the tank tube chart reference to the 7025 is for "authenticity"
reasons in the reissue.
Even with the cap mod (and with old 6K6, 12AX7, and 12AT7 tubes in
place), my reissue still has a good bit of the treble-y "ice pick"
effect (at least when compared to the 6G15 tank I built). Don't
know if you'll ever get "full tone control", but maybe a 12AT7 will
take a little edge off of the tank. Good luck!
-Dick
--- In , "rio452001" <mpietra102@a...>
wrote:
>
> I recently got one of the Blackface Reverb Reissues from MF.
>
> It arrived with the RCA connection from the tank unplugged, so I
had
> to fiddle around with that first, and then after I got the reverb
> working, I couldn't turn the tone past "1" due to the harsh high-
end
> thing.
>
> I was aware of the issue from the various posts here, so I headed
> over to my local used/vintage instruments shop to pick up a 6K6
and
> AT7. I ended up with a Marconi 6K6 ($15Cnd) plus a back-up. But
> instead of an AT7, the amp guy suggested a 5751.
>
> That allowed me to turn the tone control to "3".
>
> Mainly I play a '65 Jaguar through a '66 Bandmaster, and the
reverb
> sounds very nice, but I suspect it could sound even better if I
had
> full tone control.
>
> Would the AT7 be preferable to 5751 (Sovtek, no less)? Should I
look
> for a 7025? Is there anything else I can do, short of the cap mod?
>
> Incidentally, like someone else has noted here, the tube chart on
the
> inside of the unit refers a 7025, but it came with a (GT) 12AX7 in
> its place.
