From: Arsenio.Novo@mba.org (Arsenio Novo)
Date: 16 Oct 95 03:04:26 
Newsgroups: rec.music.makers.guitar
Subject: Re: treble booster
Organization: MtlNet (MBA.org) MBA [514-465-8524] Brossard, QC 

 Mm> From: mmm@icf.hrb.com (MAX M. MAGLIARO)
 Mm> Newsgroups: rec.music.makers.guitar
 Mm> Subject: Re: treble booster
 Mm> Organization: HRB Systems, Inc.

 Mm> In article <45cehp$ed5@ixnews2.ix.netcom.com>, led_zep@ix.netcom.com
 Mm> (John Sampson ) writes:
 > I'd like to get a boost of some more treble out of my Crate VC50, so my
 > question is what does it entail to get a treble booster...and how much.
 >

 Mm> Alternatively, you can
 Mm> (if you are willing) try the ole' Fender "bright switch" trick.  They
 Mm> basically wire a .001 uF (I think, Fender sharpies out there correct me
 Mm> if I have the wrong value) disc capacitor across the volume control.

 Mm> Max Magliaro


If your amp has a spare 12AX7 half thats doing nothing you might try
moding the following treble boost circuit into the 1st pre-driver
stage.  It sounds rather nice and definitely has a better tone than
that distinctive breaking glass sound you get from bypassing the
volume wiper.

At one point in time I owned a Traynor YGM-2 Guitar Mate.  It had
6BQ5/EL84 finals which output 25.2W rms continous into 8 ohms and a
sensitivity of 4.19mV/1W/8ohm.  It had a really nice tremolo circuit.
The only mod I made to it was to use the spare 1/2 12AX7 to create a
creamy sweet active treble boost to replace that wiper bypass horror.

This active treble boost circuit I designed produces the sort of sound
lead guitarists are known to trade in their mom's for... :)

   Here it is:

                      o +300v (pre-amp supply)
                      |
      (12AX7)        1|
                    -----
                2 - - - -
                 | ,-----   (150v)
                 |      3|-----------.-------------------| |--o Output
                 |       >          _|_
                 |   1K8 >     2n2F ---                Treble
                 |       >           |------------o -. -boost
                 |_______|           |    .-------o -'
                         |           |    |    .--o    -off
                        6|           >    >    | spdt
                    7  -----     2M2 >    > 33K|
     Input   o-| |--.- - - -         >    >    |
                    | ,-----         |    |    |
                    |      8|-/\/\/\-+----+----+
                    >  (1v5)|  20K   |
                1M  >       >       _|_
                    >   1K8 >       ---  680pF
                   _|_      >        |
                   ///     _|_      _|_
                           ///      ///

Try for 5% capacitors and resistors.

Please, comment if you've ever seen a similar circuit configuration.

Be seeing you,
 Arsenio
arsenio.novo@mba.org


... I remember the 6SN7...   
~~~ ReneWave v1.01 [NR]
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