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Marshall tube amp. problem

B

Basil

Jan 1, 1970
0
Hello all
I have a Marshall 50 watt tube amp. that starts to
motorboat when the gain is turned up. Looking
for suggestions on what to look for.
tia Basil
 
E

exray

Jan 1, 1970
0
Basil said:
Hello all
I have a Marshall 50 watt tube amp. that starts to
motorboat when the gain is turned up. Looking
for suggestions on what to look for.
tia Basil

Bad paper caps? Have they been replaced yet?
-Bill M
 
B

Basil

Jan 1, 1970
0
Thanks Bill
All the caps. are polyester and the 3 electrolytics. I did
replace the
power supply cap. no help.
Basil
 
M

Merlin Zener

Jan 1, 1970
0
Has it been years in a dusty/smoky environment?
A thorough cleaning - especially around the valve sockets might help.
 
B

Basil

Jan 1, 1970
0
message
Has it been years in a dusty/smoky environment?
A thorough cleaning - especially around the valve sockets
might help.

I will check on that Merlin thanks.
I think this was a back up amp that was in use so SMOKY? but
now days
not as much but its old 1986 or so.
Basil
 
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