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Uher EG740 tuner from 1979 probably
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N_Cook
Oct 27, 2014, 9:49:18 AM10/27/14
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Used every day,on FM, until one day, switching on and very low level
audio out. Tuning is fine on FM and AM is normal. Phono and Aux inputs
to amplifier are normal. Schematic on elektrotanya. Nothing loose found
on twizzling. There are some ceramic resonator filters, I'm aware of
silver migration over such time spans , resulting in attenuation of
throughput, anything else to zero-in on?
Lots of Din connectors connecting tuner to preamp and amp, power ,
signal and control connections. Any advice on improving contacts other
than needle insertion to tension up the socket yokes a bit.
audio out. Tuning is fine on FM and AM is normal. Phono and Aux inputs
to amplifier are normal. Schematic on elektrotanya. Nothing loose found
on twizzling. There are some ceramic resonator filters, I'm aware of
silver migration over such time spans , resulting in attenuation of
throughput, anything else to zero-in on?
Lots of Din connectors connecting tuner to preamp and amp, power ,
signal and control connections. Any advice on improving contacts other
than needle insertion to tension up the socket yokes a bit.
Helmut Wabnig
Oct 27, 2014, 5:22:32 PM10/27/14
to
N_Cook
Oct 28, 2014, 11:35:14 AM10/28/14
to
Uses 4x 10.7M ceramic resonators, the resistance associated with 2 of
them , is from the rest of the circuitry
Looks like it was a retrofit electrolytic to a 9.4V line, with a large
component side solder blob that had corrossion product that touched a
bare bridge wire from the mute line of the main control IC.
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