70's Fender Deluxe Reverb - Needs work - Any Schems?

thefastvinny · Post by **thefastvinny** » Wed Jun 24, 2009 9:37 pm

I came across a Fender Deluxe amp from around the late 70's. There isn't much info on it for the year or anything. It does say Patt. #44 if that says much to anyone. It needs some work to get running again. Does anybody have some schematics or drawings that may match this model? Any help would be great. Thanks

The Scum · Post by **The Scum** » Wed Jun 24, 2009 9:40 pm

Do you have the Aspen Pittman book? They're probably in there.

Post by **TapeOpLarry** » Thu Jun 25, 2009 8:48 am

"The Tube Amp Book - Deluxe Revised Edition Book and Disk Package"

Contains a ton of amp schematics and info. Great resource.

oldguitars · Post by **oldguitars** » Thu Jun 25, 2009 8:53 am

is it the one with the volume boost? if so, then here:

http://www.blueguitar.org/new/schem/fen ... _schem.gif

sound for sandwiches · Post by **sound for sandwiches** » Fri Jun 26, 2009 11:02 am

google "Fender Amp Field Guide". It's good if you don't know exactly which version of an amp you have or what year it was made, it describes the various changes to models over the years and distinguishing features. There are schems for most Fender amps there.

Mudcloth · Post by **Mudcloth** » Sun Jun 28, 2009 7:23 am

Sometime ago I found a resource online that had most of the Fender chassis codes listed. I have no idea where I got it from. Here are the Deluxe Reverb codes that were listed:
Deluxe Reverb AB763, AB868 (silverface)
A24000 to A26000 - 1967
A26000 to A28500 - 1968
A28500 to A33000 - 1969
A31000 to A33000 - 1970
A33000 to A34500 - 1971
A34500 to A37000 - 1972
A37000 to A39000 - 1973
A39000 to A42000 - 1974
A42000 to A43000 - 1975
A43000 to A45000 - 1976

Here the Fender Amp Field Guide site:
http://www.thevintagesound.com/ffg/
Another great resource:
http://www.fenderforum.com/forum.html

What's wrong with the amp, specifically?
-Matt

thefastvinny · Post by **thefastvinny** » Tue Jun 30, 2009 6:44 am

It was missing the 6V6, AX7, and GZ34 tubes. There is about four wires that have popped off. I haven't gotten the tubes yet so i haven't turned it back on. It hasn't aged well. The face plate looks good but there is quite a bit of rust through out the rest on the unit.

sound for sandwiches · Post by **sound for sandwiches** » Tue Jun 30, 2009 10:45 am

You'll almost certainly need to replace the electrolytic caps in the power and bias supplies. The pots are probably going to be shot as well. Are the wires you say have come loose, are they the ones that go to and from the reverb tank and speaker, or are they inside the chassis?

I overhauled a basket case silverface fender (super bassman head) recently that sounds like it was in similar shape to yours. it had seen some moisture in the inside of the chassis and the circuit boards had gotten a little warped, so I was careful to check for shorts before powering up. It got all new pots, electrolytics, and tubes. It cleaned up pretty good, but I think I will have to go back into it and adjust or replace the tube sockets, because one of the power tubes keeps cutting out.

I've heard that it is a bad idea to try to de-rust transformers- the rust on the laminations can actually improve the tone of the amp according to some. if moisture has gotten inside the xfmrs though, there might be damage to the bobbin. I have no personal experience with this- just random unverifiable information from the internet.

good luck, and beware of high voltages.

thefastvinny · Post by **thefastvinny** » Wed Jul 01, 2009 7:41 am

If I remember correctly, two of the wires were going to both of the 6v6 tubes from one of the transformers. Most of the moister seems to mainly be on the outside of the transformers and chassis. I think it may have just been from sitting in the humidity for so long. Tube amps are some what new to me but I can get them figured out. I am going to get a couple books and I found a bunch of good information to do so. After I get this amp working again I want to start building tube amps. Thanks for the reply man, take care.

sound for sandwiches · Post by **sound for sandwiches** » Wed Jul 01, 2009 12:22 pm

that would be the output transformer- is there evidence that a previous owner tried to remove it? if it's bad you won't be out too much, replacement OT's for deluxes are all over the net for $40-50

thefastvinny · Post by **thefastvinny** » Wed Jul 01, 2009 12:58 pm

It doesn't really appear that anyone tried to remove it. I think time and weather just oxidized the wire and it eventually broke off. I found this amp in a repair shop and the owner abandoned it because of the cost of repair i guess. I don't have any documentation on what it was in repair for nor do I have a trouble report. I just can't see why someone would abandon an amp like this ya know.

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70's Fender Deluxe Reverb - Needs work - Any Schems?

70's Fender Deluxe Reverb - Needs work - Any Schems?

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