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Post subject: 1968 Fender Super Reverb parts list
Posted: Mon Nov 01, 2010 10:51 am
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I have a 68 super reverb that has a very bad volume potentiometer. From the schematics this is a 1Meg Pot. Looking for an actual parts listing for these amps. Any ideas?

Thanks Kent


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Posted: Mon Nov 01, 2010 1:58 pm
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I don't think parts list exist.

Are you sure is the pot your problem ? You can't fix the pot ?

If you want more help give the schematic number like AB768....


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Posted: Mon Nov 01, 2010 2:52 pm
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1968 was a transition year for all Fender amps. In the case of the Super Reverb, the amp could've been wired to either of two distinct schematics -- AB763 or AB568 -- and there are significant differences, especially in the biasing circuit and the output stage. As for a volume pot, those are most likely identical regardless of circuit revision. You might check with Steve at Angela Instruments. He stocks the most common OEM parts for nearly any Fender amp, both domestically-made and foreign.

HTH

Arjay

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"Here's why reliability is job one: A great sounding amp that breaks down goes from being a favorite piece of gear to a useless piece of crap in less time than it takes to read this sentence." -- BRUCE ZINKY


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Post subject: 1968 super reverb pot.
Posted: Tue Nov 02, 2010 3:52 am
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thank you. This is the AB763 circuit.


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Posted: Tue Nov 02, 2010 5:09 am
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Did some of the circuit numbers overlap on the tube charts in that time period?


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Posted: Tue Nov 02, 2010 6:23 am
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srvwalk, what is your problem ? Why do you think is a bad potentiometer. Wht did your amp do ?


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Posted: Tue Nov 02, 2010 9:13 am
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Rebelsoul wrote:
Did some of the circuit numbers overlap on the tube charts in that time period?


Yes. I've examined many silverface amps sporting an AB763, AB165, or AA864 tube chart within the cabinet but the chassis was plainly a later revision. Regardless of what the tube chart reads, it the majority of the wiring within consists of plastic-insulated wire then the amp is probably not an AB763 circuit.

HTH

Arjay

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"Here's why reliability is job one: A great sounding amp that breaks down goes from being a favorite piece of gear to a useless piece of crap in less time than it takes to read this sentence." -- BRUCE ZINKY


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Post subject: Fender Super Reverb issues
Posted: Thu Nov 04, 2010 10:51 am
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stratele52 wrote:
srvwalk, what is your problem ? Why do you think is a bad potentiometer. Wht did your amp do ?


The amp was breaking up. You could tap around the input jack of the VIBRATO INPUT and around the pot and the amp would breakup.

I switched to the other "NORMAL" input(Not Vibrato) and I had no problem.

any other ideas other than the Potentiometer?

Thank you,
Kent


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Posted: Thu Nov 04, 2010 11:00 am
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No that's not the pot . Bad solders or resistor damage , broken. You have to look inside.
Attention, lethal voltage inside even your amp is unplug from the wall outlet. Capacitores inside keep volttage many days


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Posted: Thu Nov 04, 2010 11:24 am
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stratele52 wrote:
No that's not the pot . Bad solders or resistor damage , broken. You have to look inside.
Attention, lethal voltage inside even your amp is unplug from the wall outlet. Capacitores inside keep volttage many days



Thank you,

I will check it out.


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Posted: Thu Nov 04, 2010 12:44 pm
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Since you've localized the problem to the vibrato channel, I would closely examine anything physically positioned in that area to include V2 and its socket, all nearby resistors and caps, and the input jack itself. The amp is some forty-two years old at this point and thermal and/or vibrational issues are fairly common among these old warriors. These vintage amps are revered for their tone and their durability but nothing lasts forever without periodic attention. Once serviced though, they usually play trouble-free for another generation or two.

HTH

Arjay

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Posted: Sat Nov 06, 2010 10:20 am
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Retroverbial wrote:
Since you've localized the problem to the vibrato channel, I would closely examine anything physically positioned in that area to include V2 and its socket, all nearby resistors and caps, and the input jack itself. The amp is some forty-two years old at this point and thermal and/or vibrational issues are fairly common among these old warriors. These vintage amps are revered for their tone and their durability but nothing lasts forever without periodic attention. Once serviced though, they usually play trouble-free for another generation or two.

HTH

Arjay


Well I thought it was localized to the vibrato channel. After further testing it breaks up and drops volume on both channels. I could tap on the small transformer(located just below the REVERB OUTPUT jack) on the unit back and cause it to come in and out.

Also, all the wiring has a fiber cloth type covering.


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Post subject: Re: 1968 Fender Super Reverb parts list
Posted: Tue Dec 14, 2010 9:20 pm
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srvwalk wrote:
I have a 68 super reverb that has a very bad volume potentiometer. From the schematics this is a 1Meg Pot. Looking for an actual parts listing for these amps. Any ideas?
Thanks Kent

parts list here: http://www.bore-tech.com/carbidebore.htm

Here is $100 worth of advice that I already paid for:
Your pots are most likely dirty.
Clean with Caig Labs Dioxit. Trust no other product. You can get it from many places on the Internet, but they usually have it at Guitar Center.
It is not too hard to clean your pot(s) on a 1968 Super reverb:
Unplug your amp.
Put amp on its side on a large table or work bench with the open back towards you.
Unplug reverb and speaker cables.
Remove back panel.
Remove clamp securing power cable to side of cabinet.
(optional: remove the tubes)
Remove the four screws securing the chassis to the cabinet top.
Withdraw the chassis from the cabinet by grasping the transformers (careful of the tubes if still installed).
(careful not to touch the circuitry inside...possible shock hazard)
Set chassis on a couple of 6 inch two-by-fours with circuitry facing upward as it normally be in the amp.
****Discharge Caps: Connect one end of an alligator clip to a plastic handled screw driver and the other end to the bare metal chassis. Holding the plastic screw driver handle touch each solder connection inside the chassis...Do not be alarmed if a few make a spark. The amp is now safe to handle.*****
Flood the pots with Caig Labs Deoxit while spinning the knob.
Use the spray tube and insert it into the slot on the side of the pot.
Spin the knob twenty to thirty times. Clean up excess from the chassis. No need to remove excess liquid from pot, when it evaporates it leaves a protective coating.
Got a BOOM noise when you turn on/off Amp or flip neutral switch?
Flood the switches with Dioxit. Flip the switch at least fifty times. The Boom will be greatly reduced and will disappear in a week of regular use.
Reverse the disassembly steps and enjoy your improved performance.
No charge, Brother.


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