Maker Pro
Maker Pro

Fender Concert amp

N

N_Cook

Jan 1, 1970
0
Bad splitter-driver plate/anode 100K resistor, what goes bad with them?
Causing rustle noise in output. Partial crack? or something chemical. I may
as well replace the 82K while I'm at it , but is there any point to
pre-emptively replacing all the HV droppers ?
Anyone happen to know the datecode structure for Mallory electrolytics of
the 1980s?
say 4uF, 450VDC
marked
012022
235
8346B

1982 and 35/52 from 235 or 1983 and 46/52 from the last number?
 
A

Arfa Daily

Jan 1, 1970
0
Ron said:
Noisy 100k resistors is a common and well known problem with Fender amps,
change em all.

Ron


I reckon that goes for all amps with 12AX7 stages, doesn't it Ron ?

Arfa
 
M

Meat Plow

Jan 1, 1970
0
I reckon that goes for all amps with 12AX7 stages, doesn't it Ron ?

Arfa

I repaired an old 50 watt Silvertone a few months ago and found two 100k
plate resistors one in the splitter and one in the reverb driver that had
increased in value by nearly double. The splitter was a 12a-something but
the reverb driver was a 6-something.
 
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