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Crate 100 head. Reverb doesn't work.

I can not get the reverb to work. However if I slam my fist on top of the unit I can faintly hear the reverb way in the background. But no reverb whatsover when using a guitar.

Posted by elvis_aggy on


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Check the input RCA plug going into the reverb tank (silver box with two wires connected to it). Make sure the amp is off when you do this. Sounds like the output is working fine if hitting the amp does it.

Posted on Jun 19, 2009


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2 Answers

I have a Peavey XR-600 PA Head, I would like to know if and how can I connect a MX 200 Dual Reverb Effects Processor to the PA Head?

If it has a effects loop output and input on the p.a. head and a in and out on the reverb effects processor, then yes you can, just run the effects loop output signal into the input on your reverb processor, out of the output back into the input effects loop on the p.a. head, kinda like you would a effects pedal thru the effects loop of a guitar amplifier. hope this helps!

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No reverb on my fender ps 160 Vocal amplifier

Here is a link to the schematic drawing

items to check are
1-the footswitch and plug
2-the reverb unit ,usually found at the bottom of the box
3-the reverb unit is plugged in to the amp
4-V6 a 7025 valve
5- the reverb switch is in the on position

Hope this helps


Oct 14, 2014 | Music

1 Answer

Crate amp head loose spring

its the reverb tank spring, look where it is connected on the other side. this will give you an idea as to where it was connected. solder it back on.

May 10, 2013 | Crate FlexWave FW120H Guitar Amp Head with...

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Hey! I have a 1975 Silverface Super Reverb. recently, the reverb has stopped working, but I can still hear the coils vibrating if I give the amp a shake, so I'm assuming some connection is bad. If I...

The unit is screwed down. There are two screws one at each end. Look hard you will find them. Most of the time there is a small transducer (coli of wire) the small wires are usualy broke.

May 24, 2017 | Fender Hot Rod Deluxe Guitar Combo...

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My crate FW120HS has suddenly started giving me loads of reverb, and i have no idea why. Iv not changed any effects or my set up. Its just suddenly happened. Any Ideas?

This has a digital reverb unit. The settings are subject to get clobbered I suspect. I don't know if you are using foot switch for the reveb control... You may also have a cable that has come loose...

Here is a link to schematic for your unit:

Notice that the reverb is set by DC voltages from teh setting pots that go to the DSP chip. These setting pots receive voltage from a 16 volt ZENER regulated source. First thing is to CHECK that voltage. If the Zener has opened and you find much over that 16 volts, that is your cause of the problem.

The circuitry is on page 1 in the 3B to 3D lower left of the page.

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1 Answer

I have a Crate Palomino V16 Amplifier. The Reverb became intermitant after about a year of use and has now quit completely. Have cleaned the contact area of the cables and inputs to the tank but still no...

Looking over the schematic I see all sorts of poor design. The reverb is driven by IC TL072 chip and the output is received by the same.

This chip is supplied with +/- 15.5 volts UNREGULATED which is stupid! If you get a power surge, the IC will be destroyed. Myself I would put at least a shunt Zener regulator on these voltages. Use a 100 ohm resistor in series and Zeners to ground for both the plus an minus 15.5 lines.

First thing check those 15.5 volt... the plus is on C23 pos term and the neg is on C24 neg term.

They have a 1 meg resistor to ground from pin 3 of the chip to bias the + input of the chip. This is TOO big as the input leakage current can be too much. I would reduce this resistor to 220K and increase C22 to 0.0047 mfd.

Check the DC voltage at pin 1 of the chip (IC1). It should be VERY near zero.

The output buffer for the reverb has better design. Check for zero volts or very near it on pin 7 of the chip. Be careful not to short to pin 7 which is pos 15.5.

If either of the above tests show a voltage over 0.5 volts from ground, replace the TL072 chip as it is likely fried by power surge..

Since there is high voltage (320 volts) use great caution when working on this amp.

Mar 14, 2010 | Crate Music

1 Answer

Crate gt 30 amp reverb wire loose. whrer does it connect?

If its the input reverb tank wire or output reverb tank wire just reconnect it (if the amp has a reverb tank).

Feb 27, 2009 | Crate Music

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