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Quote from: Tassieviking on April 01, 2024, 11:00:20 AMWhen you plugged into the effects return with the guitar did it sound nice and clean ?
Yes, it did.
Do you have another amp you can use?
No. None of my three amps have an effects loop, but I'll ask around for a loaner.
Try an overdrive pedal straight into the return and you are bypassing the preamp again.
My friend will loan me his Boss Dist. pedal.
You have to try to determine if the problem is the preamp or power amp.
Preamp is guitar input on front to the send jack on back.
Power amp is return jack to speaker out.
Thanks, I'll report back.
Quote from: RookieRecurve on March 31, 2024, 08:39:55 AMI see these pop up often around me, but not for that price! There's one I saw for $100 with only one of the two channels working. I thought about buying it to try and fix it, then flip it. It would be too loud for me, but they are pretty amazing amps. The ease of access to incredible schematics makes these a great buy.
Quote from: Tassieviking on December 19, 2023, 12:06:40 PMIf you want to mess with the amp then you should leave the power amp section alone.
The pre-amp is where the tone shaping happens.
The closest you should go to the power amp is the 100nF cap going into the power amp, that 100nF cap with the 100k to earth is a HPF filter that drops any frequencies below 15.9Hz. Change to a 10nF cap and the frequency is 159Hz, experiment if you like.
I would concentrate on the tone stack, changes there will affect your tone more.
Are you sure it is not the speaker itself that is dark sounding ?