Hi
I am working on this JCM 2000 DSL100 which a friend sent to me for checking. Upon opening the amp, I realise that a " JCM 2000 stable Bias Mod" has already been installed earlier. I plugged in a CD player and turned on the amp. At first the amp was working as normal, After a while, there was a slight buzzing and it startd to get louder, at the same time the music started to get softer. This contiued , the buzz getting louder while the music fading, After about an hour the buzz was much louder and the music could hardly be heard. The bias reading is stable and was not drifting. What could be the cause? Could it be due to the B+ voltage leaking into the preamp tubes or could it be a problem with the the Output Transformer. Please assist.
Thanks
I am working on this JCM 2000 DSL100 which a friend sent to me for checking. Upon opening the amp, I realise that a " JCM 2000 stable Bias Mod" has already been installed earlier. I plugged in a CD player and turned on the amp. At first the amp was working as normal, After a while, there was a slight buzzing and it startd to get louder, at the same time the music started to get softer. This contiued , the buzz getting louder while the music fading, After about an hour the buzz was much louder and the music could hardly be heard. The bias reading is stable and was not drifting. What could be the cause? Could it be due to the B+ voltage leaking into the preamp tubes or could it be a problem with the the Output Transformer. Please assist.
Thanks
