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I tune on my frontman 25r and when I input I dont get any sound other than hiss.I tried two different cords and guitars but nothing but his. what should I do?

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It sounds like a failure in the preamp stages, but fortunately you can do a lot of troubleshooting externally.

Drive the "power amp input" jack with another source of audio that has some reasonable output... like a small CD player. If this works (no mind the level, just the quality, that will verify if the power amp is OK.

If the power amp is OK, the use the preamp out to another amplifier.

If it is OK, then the Power amp input jack switch MAY be bad, When nothing is plugged into these, the preamp is sent to the power amp by a switch on the power amp input jack.

If you do these tests, you can email me the results and I will give further tests to run.

Posted on Nov 19, 2009

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I want you to do a test: With a set of headphones plug them into the preamp output and then play your guitar... don't expect much loudness, it may be very faint and will ONLY be in one of the sides of the headphones. This tests the preamp section... have the guitar volume wide open.

IF you can hear the guitar that way, then the switch contact on the PA INPUT jack (not the preamp output) is not making contact. These jacks are really poor and the problem is not that uncommon. Fix is to open the unit and increase the spring tension on the contact or replace the jack. Never use the jack as they worsen evertime you plug something into it.

Note that the failing switch symptom MAY be broken soldering in the vicinity of the jack so look for that also. And also check the soldering of the guitar input jack as that is a common problem. Always loop your guitar cable through the handle so tripping over the cable doesn't break the jack by yanking the plug sideways... another common problem.

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