audio-talk

It's been a while ..... but finally fixed all the problems with the amp.

The second saturated guitar sound was the main amp chip, something wrong with it, so I replaced it again ebay -

LM1875T National Semiconductor 20W Audio Amp IC LM1875

and works fine the original problem of the components ...

well thank you again mike H, and chris661 cheers, tried both valves i have, the one that was in is only about 6 months old and have tried a brand new one in it too, sounds same unfortunatly

Yes thank you that worked, thank you.

the original problem must of been the all the dry solders in the amp causing snap crackles and pops, and whining.

After I removed the amp from the casing and fixed all these bits I failed to realise that the casing connected to the input jack was earthing it ...

Dave the bass, yes the fault is somewhere else, my first fix was just replacing the r53 and c71, but not the ic..... R53 just melted,

since my first post I replaced R53 again also replaced the ic 'lm1875t'
R53 smoked and the amplification was very noisy, i quickly turned off the amp, so you are ...

i Have also had the same r53 melt causing the c71, to also melt, after reading this thread plus some others i replaced the two mentioned components and r53 instantly melted again...... i am pretty new to messing with the inner workings of amps ,,,,, so reading further on and asking some advice i ...