2001 Fender Super Reverb

[pontiacpete]

[QUOTE=52 Bill;106110]

The added diodes are in series with the tube rectifier.

To 52 Bill,
What purpose do those diodes in series have?
thanks
pete

[sudgut]

I seem to be getting the correct voltages +/- 10% as stated in the schematic. Iwill post where the 6L6 wires got to in a day or so but I will say there seem to be more than the schematic shows and was wondering if there is some kind of mod people do to the amp that would account for that.

I am getting 468VDC at TP1 and similiar stated voltages both AC and DC throughout most of the circuit although I have not checked all points possible as of yet due to my 2 jobs and my wife bugging me for wasting too much time on the thing.

[52 Bill]

I seem to be getting the correct voltages +/- 10% as stated in the schematic. Iwill post where the 6L6 wires got to in a day or so but I will say there seem to be more than the schematic shows and was wondering if there is some kind of mod people do to the amp that would account for that.

Do you want to bring the amp back to original state or just make it work? In either case you will need to figure out what the previous person did before you can move forward.

When I get an amp that has been modified, the first thing I do is check out what was done to the amp before anything else. I will always assume that the work may be at fault and needs to be checked.

The diodes added to the rectifier tube will prevent the amp from blowing a fuse if the rectifier tube should happen to short.

[sudgut]

Isnt it better to blow a fuse than to sacrafice other components??

BILL 52.Thanks for the reply. I just want the amp to original specs and working as meant. If some minor tweaking has to be done later so be it. I am not sure if I can trust the original schematic exactly. If I can I will do that but I am a little unfamiliar why so much seems to have been changed and what damage I can do if I miss something. I did put it all back together today,which is not much to do, powered her up and still the same thing. The clean fender sound is gone but alot of gain/distortion is present even though the volume is very very low no matter what the knobs are at. I do hear more reverb with that pot turned up.....maybe something toasted in the power section or whatever mod someone tried they did it wrong and toasted something.

Does anybody know if I go by the Fender schematic, checking all components on the chasis, changing components where needed, changing all caps anyway. Will this amp "theoretically " work????

Is it worth it, should I rebuild from scratch or buy a new circuit board from fender if they even sell them. I am in no hurry.

P.S Not that much on the Super board compared to a 1 year old Hot Rod I purchased. That ones more of a printed circuit board.

Thanks, JIM

[JoeM]

Isnt it better to blow a fuse than to sacrafice other components??

Well, yes. But here's an article that explains the use of the diodes in series with the tube rectifier:

The Immortal Amplifier Mod - Premier Guitar

[52 Bill]

Well, yes. But here's an article that explains the use of the diodes in series with the tube rectifier:

The Immortal Amplifier Mod - Premier Guitar

I didn't know that RG was the creator of this mod.

As for the schematic, even though there may errors, most Fender schematics are accurate. I wouldn't not trust it just because you don't know that it's not exactly right.

Again, I would first try and figure out what was done to the amp. And then fix or un-modify it. Print out a copy of the schematic and then start at the power supply and make red notes on it when you find something that doesn't look right or has been changed.