Menu
I picked up an 12AT7 at lunch so I'll try replacing the 12ATX with it
when I get home and will post if it helped fix the problem. If it
doesn't, I guess I'll try changing the C9 cap as well...
--- In , "Roland Bettenville"
<roland.bettenville@p...> wrote:
> I'm not sure about that, maybe a little bit
>
> Roland Bettenville
>
> roland.bettenville@p...
>
>
>
>
>
> -------Original Message-------
>
> From:
> Date: woensdag 16 april 2003 19:16:49
> To:
> Subject: [SurfGuitar101] Re: More Reverb Questions...
>
> Thanks for the suggestions. I switched out the C10 cap a long time
> but I'm a little hesitant to mess with C9. You don't think
switching
> the 12AX7 with a 12AT7 will help much?
>
> Also, anybody taken out the circuit card? If so, how did that
effect
> your tank's sound? Anyone know of a good site that explains how to
> remove it?
>
> Thanks!
>
> --- In , "Roland Bettenville"
> <roland.bettenville@p...> wrote:
> > another possibillity would be soldering a capacitor across R13.
> This is a
> > 1Meg resistor connected to pin 2 of the 12AX7 tube. You can try a
> cap in the
> > range of 100pF up to 220pF and see (hear) what works best.
> > Needless to say that you should take all safety precautions and
if
> you are
> > not at ease with it you should leave it to a pro.
> > Roland Bettenville
> >
> > roland.bettenville@p...
> >
> >
> >
> >
> >
> > -------Original Message-------
> >
> > From:
> > Date: woensdag 16 april 2003 09:19:54
> > To:
> > Subject: [SurfGuitar101] Re: More Reverb Questions...
> >
> > 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
> >
> > > >
> > > >
> > > >
> >
> >
> > ------------------------ Yahoo! Groups Sponsor -------------------
--
> ~-->
> > Make Money Online Auctions! Make $500.00 or We Will Give You
Thirty
> Dollars
> > for Trying!
> >
> > ------------------------------------------------------------------
--
> -~->
> >
> > 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
>
> >
> >
> >
> >
> > .
> >
> > [Non-text portions of this message have been removed]
>
>
> ------------------------ Yahoo! Groups Sponsor ---------------------
~-->
> Make Money Online Auctions! Make $500.00 or We Will Give You Thirty
Dollars
> for Trying!
>
> --------------------------------------------------------------------
-~->
>
> 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
>
>
>
>
> .
>
> [Non-text portions of this message have been removed]
