Is there a trick to this? 64 Super reverb snaffu

[soldersucker]

I am working to bring my 64 super back to original,in the past a mod happy teck cut some of the under board wires flush with the eyelets.And pro's care to share any tricks to make removing/replacing these less of a PITA?

[Blue Strat]

Not sure exactly what you need. I'm guessing you're looking at the bottom of the board if you reported the above status. Getting into position to see the bottom of the board is obviously the hardest part so....

Other than that, it's not absolutely necessary for those wires to be attached/reconnected to the bottom of the board, but try to route them away from other wires as much as possible.

[soldersucker]

Thanks Mike,it's the a couple wires that are fished inbetween the black fiber board that have been cut flush at the eyelet.I'm having to rebuild the Tremolo section so i have decided to just run those wires above i get the feeling that i could do more harm for not much benefit.

[Wakarusa]

Cut flush at the eyelet or cut flush at the pass through hole? (the first implies a metal ring, the other just a hole in the fish paper). I'm guessing the latter.

Running new wires above the boards does no harm as long as you keep good separation between existing and new. Not as pretty, but works.

The way to replace "between the boards" wiring is to lift the boards. You have to disconnect all of the front panel controls and then desolder the leads running from the "front edge" of the board to the filter caps in the dog house beneath. You may also have to disconnect bias feed and some B+ lines depending on how much slack Leo et. al. left you. Then the board just tips up to allow access.

The problem is that if you're not careful you can fatigue solder joints on the "rear edge" of the boards and on tube sockets. You'll definitely disturb the lead dress everywhere.

[soldersucker]

Thanks Todd i have been plugging away today slowwwly(kids first day of summer break)Thanks for the professional advise thats why i love it here.I am routing above the board and trying to use the same coloured cloth wire from my stash doesn't look bad at all.The potential for compounding problems(cold joints/etc...)doesn't make sense to me the amp will still only be 75% original and i can live with that.Just second guessing one thing though-- on the AB763 BFSR layout right next to V2's plate resistors there is an underboard connection marked "Z" it seems to start at the junction of the .02 cap and the 500pf and terminate at the end of the 3.3Meg/10pf reverb circuit.My photocopy is blurry could one of you fine gents confirm?

[Wakarusa]

on the AB763 BFSR layout right next to V2's plate resistors there is an underboard connection marked "Z" it seems to start at the junction of the .02 cap and the 500pf and terminate at the end of the 3.3Meg/10pf reverb circuit.My photocopy is blurry could one of you fine gents confirm?

You have read the layout correctly. You can confirm for yourself by looking to the schematic -- the second triode in V2 is the "vibrato" channel tone stack recovery. In the schematic it feeds its 100K plate resistor and 0.02uF coupling cap. From there we split between the 500pF cap (which then goes off to V3 grid - the reverb driver) and the 3M3 resistor in parallel with a 10pF cap -- the big resistor that develops the voltage differential between reverb send and return.


PS: I'll never understand the fascination with how the circuit looks -- I get that people care, I just don't get why. If you could see any of it when in normal operation perhaps... Maybe I need sensitivity training. Or a Feng Shui course.

[soldersucker]

Thanks again all i need now is a tremolo roach and a power tranny.The best option i can find for a tranny is the Mercury Magnetics over at Webervst(116.00$)they offer a lower B+ version for a few more bucks.Any better options are welcome.

[Blue Strat]

I highly recommend getting a Surf Bug (Google will lead you to the source) over a standard roach. These not only give a deeper trem, but offer less tone sucking (insertion loss) when the trem is off. Well worth the extra $10 or whatever.