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A pal and I tweaked our reverb units this past weekend and we found a 12AU7
instead of an AT7 made 'em nice and mellow sounding (but maybe not as deep).
At 03:54 AM 9/27/2003 +0000, you wrote:
>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.
>
>
>
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