Electronics Repair (sci.electronics.repair) Discussion of repairing electronic equipment. Topics include requests for assistance, where to obtain servicing information and parts, techniques for diagnosis and repair, and annecdotes about success, failures and problems.

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Old February 8th 08, 05:34 PM posted to sci.electronics.repair
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Default Trace acoustic TA100R, combo , 1994

Loss of reverb effects. But of course when I try it all present and correct.
Other than attending to the usual suspects ,anyone know of a specific
problem with these?

Presumably unconnected problem - anyone know what the 1.5x1.5x1 inch epoxied
block is that has fallen (safely because of plastic housing) against the
power transistors is, 5 wire ribbon connected ?

Owner reports that the moveable notch filter has never worked.
I try it with sig gen and operates over 120 to 1200 Hz , noticeably reducing
the throughput.
Is he likely top thing it should totally suppress at the chosen notch f ? .
If I put a scope on it , what would the usual dB peak cut be of such a
notch, generally speaking, not necessarilythis Trace amp?

--
Diverse Devices, Southampton, England
electronic hints and repair briefs , schematics/manuals list on
http://home.graffiti.net/diverse:graffiti.net/



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Old February 10th 08, 12:03 PM posted to sci.electronics.repair
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Default Trace acoustic TA100R, combo , 1994


N Cook wrote in message
...
Loss of reverb effects. But of course when I try it all present and

correct.
Other than attending to the usual suspects ,anyone know of a specific
problem with these?

Presumably unconnected problem - anyone know what the 1.5x1.5x1 inch

epoxied
block is that has fallen (safely because of plastic housing) against the
power transistors is, 5 wire ribbon connected ?

Owner reports that the moveable notch filter has never worked.
I try it with sig gen and operates over 120 to 1200 Hz , noticeably

reducing
the throughput.
Is he likely top thing it should totally suppress at the chosen notch f ?

..
If I put a scope on it , what would the usual dB peak cut be of such a
notch, generally speaking, not necessarilythis Trace amp?

--
Diverse Devices, Southampton, England
electronic hints and repair briefs , schematics/manuals list on
http://home.graffiti.net/diverse:graffiti.net/



The notch f spread should be a tad lower.
Don't know if the epoxied block is cutout/excess gain control or "Dynamic
Correction" (TM) apparently for correcting speaker induced distortion in the
pa. I assume the latter as TM and otherwise presumably unnecessary epoxy.
The 5 wires are opamp +&- DC rails , pa and ps ground lines (about 0.2R
between the two) and a line to the + i/p of the pa preliminary 071 op amp

--
Diverse Devices, Southampton, England
electronic hints and repair briefs , schematics/manuals list on
http://home.graffiti.net/diverse:graffiti.net/







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