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I have the same problem with my RI tank...it produces these evil
harsh high frequency overtones if the tone nob is past 2 or 3. I
have done the cap mod and run a 1952 NOS 6k6 in it. Can someone
confirm that using a 12AT7 instead of the 12AX7 will solve this
problem? I'm at the end of the line for mods to fix it and am hoping
this will do the trick. Think it will?
--- In , "Dick Messick" <rmessick2@a...>
wrote:
> Gavin:
> I'm assuming that you have a RI tank (I forget, I'm sure you've
mentioned it
> before . . . ) One non-invasive technique to take the edge off of
the
> treble is to replace the 12AX7/7025 tube with another 12AT7 (NOS, of
> course). The 12AT7 has about 70% of the gain of a 12AX7, so it
really tames
> the screech, but still allows the tank to sound great. That's a
quick,
> easy, and reversable cure, IMO. Also, I think if you back off the
dwell and
> mix controls to below "7", you should be able to turn the tone pot
up
> without having your ears bleed. However, that may sacrifice some
of the
> sproing you're looking for - try using the 12AT7 instead of the
12AX7 - I
> think you will be pleased with the results.
>
> Good luck!
>
> -Dick
>
> ----- Original Message -----
> From: <gavinehringer@m...>
> To: <>
> Sent: Wednesday, December 11, 2002 10:11 PM
> Subject: [SurfGuitar101] More Reverb Questions...
>
>
> > Okay, here are some new reverb issues. I had all kinds of sproingy
> > sounds coming out of my Fender tube reverb unit (think "Pipeline"
> > intro), so I've moved it up onto a shelf. Problem solved. Now,
how do
> > I shock-proof the amp for live gigs? Or am I needlessly worrying?
I'm
> > sure many solutions will be proposed!
> >
> > Second, my Reverb is real trebly. I did the 6K6 tube replacement,
and
> > it didn't improve considerably. I have played with the other 12AT
and
> > 7025 tubes, and even with nice Ei replacements, it's still
screechy. I
> > don't want to do the cap switch - too techical for moi. Are there
> > other suggestions? AS it is, I don't even turn the tone pot
past "2"
> > (but put the dwell and mix at 8 or 9!)
> >
> > BTW, this group has been great. It keeps me focused and playin,'
so
> > thanks to all.
> >
> > Gavin
> >
> >
> > To unsubscribe from this group, send an email to:
> >
> > Visit for archived
messages,
> bookmarks, files, polls, etc.
> >
> >
> >
> > Your use of Yahoo! Groups is subject to
> >
> >
> >
