Search found 5 matches

by johnyk
Mon Sep 01, 2014 10:41 pm
Forum: Instruments
Topic: Flamin' Marshall AVT 20!
Replies: 31
Views: 43743

avt 20

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 burnin...
by johnyk
Thu Jun 21, 2012 10:30 am
Forum: Instruments
Topic: Flamin' Marshall AVT 20!
Replies: 31
Views: 43743

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 :?
by johnyk
Wed Jun 20, 2012 2:52 pm
Forum: Instruments
Topic: Flamin' Marshall AVT 20!
Replies: 31
Views: 43743

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 jus...
by johnyk
Mon Jun 18, 2012 3:31 pm
Forum: Instruments
Topic: Flamin' Marshall AVT 20!
Replies: 31
Views: 43743

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 righ...
by johnyk
Tue Jun 12, 2012 12:49 pm
Forum: Instruments
Topic: Flamin' Marshall AVT 20!
Replies: 31
Views: 43743

marshal avt 20

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 cam...