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Reverb? Tremolo? Where to start? [message #2770]

Fri, 30 May 2003 03:32

stevostan
Messages: 2
Registered: May 2003

Junior Member

I just recently recived a 'frankenstein' early head. I was told that everything worked great before it was shipped, but apon getting it the reverb and tremolo do not work. When turning up the reverb, the guiat signal is progressively cut out, - if the reverb is all the way up, there is no guitar. The 'intensity' and 'speed' knobs don't do anything. I haven't opened it up yet, but plan to tomorrow, any suggestions?

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Re: Reverb? Tremolo? Where to start? [message #2782 is a reply to message #2770]

Tue, 03 June 2003 15:42

stevem
Messages: 4748
Registered: June 2004
Location: NY

Senior Member

Hi.Did you check the reverb pan? The small input wires inside the pan may be broken off the transducer, and shorting out to each other or the pan.As far as the tremlo goes, my frank head only has reverb, you may only need a foot switch to cut in the tremlo. I dot know for shure as I have never seen a schematic for the early amps. If you do not have a foot switch, try rubber banding sometin foil around a guitar cord and see if the tremlo than works.

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Re: Reverb? Tremolo? Where to start? [message #2836 is a reply to message #2782]

Mon, 16 June 2003 02:57

stevostan
Messages: 2
Registered: May 2003

Junior Member

My amp doesn't not have any type of footswitch, nor a place for one. I opened her up and everything seemed solid. I'm stumped.

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Re: Reverb? Tremolo? Where to start? [message #3193 is a reply to message #2836]

Mon, 27 October 2003 14:37

Roy
Messages: 11
Registered: June 2004

Junior Member

You're going to need an oscilloscope to fix this, especially without a schematic. You can do a basic check on the tremelo with a voltage/ohmmeter. If the lightbulb in the heatshrink is burnt out, the tremelo will not function. The bulb should be almost a short circuit (around 4 ohms), if it is an open circuit, it needs to be replaced (you can use a CM49 lamp from Mouser Electronics). You can use the voltmeter to check and see if the oscillator is working by probing the intensity and speed pots. You should see a rising and falling dc voltage there.

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