Question about Fender Hot Rod Deluxe Guitar Combo Amplifier

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Amp is little used and now the reverb is not working. It is never moved from the room where I play.

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There are only TWO op-amps and the tank involved with the reverb. Both of those are in one IC chip labeled "U2". It is a TL072.

Pin 1 of that chip is the output to the tank and pin 7 is the inout of the reverb control pot that then goes into the power amp.

They resistively mix the delayed reverb signal with the straight signal at the input of the power amp.

I assume you have turned up the reverb control which is just a volume control for the signal going through the tank.

There are so few parts involved with this that a failure is really rare.

Posted on May 14, 2010

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Clean the RCA jacks of the reverb unit first before asserting to all that troubleshooting. Twist them back and forth to clean the socket. The complicated stuff is usually the last thing necessary. Loose or bad connections are usually the cause of this kind of thing.

Posted on Mar 08, 2013

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http://www.prowessamplifiers.com/schematics/fender/ps160.pdf

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There are two coils in the reverb unit which use delicate wires which can break off - these can easily be checked, as follows:-

i) Remove one cable plug from the reverb unit & substitute an uncapped phono plug to the socket.Then check that there is electrical resistance across the plug terminals.

ii) Reconnect original phono plug & do same test as i) to the other socket.

iii) If either is open-circuited, then look for a break in the lead-out wires from the corresponding coil inside the reverb unit.
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iv) If there is electrical resistance at both sockets of reverb unit, then clean both original phono plugs & try the system again.

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Could have broken a spring in the reverb tank, or a wire connecting it to the amp, or the reverb driver tube, or a few other things, but those are the most likely in this situation. Thats what I'd check first. Give it a little slap and if it vibrates like normal, your spring is probably ok, you can still open it up and double check though. Check your wires. Then pull your reverb driver tube and replace it. If that doesn't work, it is probably in the circuit somewhere, and you should not work on your amp unless you know what you are doing. They store large amounts of electicity in the caps and they can kill you.

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1 Answer

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probably a bad reverb tank. there is a little inductor inside that shorts out easily/common. you cant repair it. its just easier to order a new tank. what you do to test is........turn on the amp with the reverb turned up all the way........ volume up on the amp at normal playing level.....then tap or knock on the reverb tank itself......if you get sound then the output of the tank is good/ no sound the ouput side is dead.......then what you do is unplug the ouput of the tank and plug the output wire to the input of the tank and tap/knock on it again....if you get sound then the input side of the tank is good/ no sound is dead. this is a way to test the tank independently from input to output. which side is bad is irrelevant, what is improtant is determining if the tank is toast. i can get accutronics tanks from my distributor at a better price than anywhere else. email me thru my contact page on my website with the tank code numbers and letters so i can get you a price also check my price with whats on ebay, etc. my website is yostamplifier.com
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I suspect the vibration when it is loud is vibrating a reverb tank within the unit.

Test this bylistening with headphones and see if you get same sound.

It may be the reverb has a resonance or the cabinet does that is sensitive to your E chords.

The shock mounting of the reverb may have failed to isolate the reverb tank from speaker vibrations... hence the headphone test.

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FIGHTING getting the thing out when it catches on the Tolex covering is the USUAL problem. Takes patience and sometimes a blade to hold the Tolex back.

USUALLY the speaker baffle stays in place.

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