Re: Blackface a Silverface Super Reverb

On Sun, 8 Jun 2008 21:23:15 -0500, "Stephen Cowell"
<scowell@xxxxxxxxxxxxx> wrote:


"tle4" <tle4@xxxxxxxxxxx> wrote in message
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"Stephen Cowell" <scowell@xxxxxxxxxxxxx> wrote in message
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"Lost in the Wasteland" <Lost@xxxxxxxxx> wrote in message
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tle4 wrote:
Sorry,
I dont have a scanner righ now. Guitar Player posts their Gear question
articles online but I dont know how long it will take for it to get up
on their web page



*black facing* generally means removing parts ... does it mention
a particular circuit ? aa763/ab763 ?

Gerald doesn't tell you that these parts were
added in order to allow the more haphazard
stranded wiring you'll see in the later units.

In order to properly blackface a Fender
you need to change the wiring to solid-core
(it stays where you put it) and you have to
do the proper lead dress (get a BF and
take pictures, my buddy did this (on my
rec!) and came out smiling).

It does not tell you what silverface circuit. I would guess it would be an
earlier one.

Here are the titles to the 4 steps

1. Rewire bias supply and add two 220k resistors

I add a 'level' pot to the existing 'balance' circuit. What 220K
resistors? Mine had 2 already.

2. Replace 4 resistors in phase inverter

That depends. I thought it sounded better without changing them. I've
since read an article somewhere on the topic (Aiken?).

3. Remove parasitic supression caps

This is the one he's not helping with... when
you remove the caps, guess what... you'll get
parasitics.

Maybe. Maybe not.
My '76 Pro Reverb does fine without them.

4. Change 5u4 rectifier tube to 5ar4/gz34 and check bias

This puts *less* sag in the circuit, and may not
be what everyone wants. Gerald sells a lot of
books... I've been to his shop and met the man.
Nice guy... no engineer.
__
Steve
.

Gerald+ grain of salt = OK

-DC
.

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