Technics SU-A8 preamplifier, no sound, help please!

cchean · 7th April 2009, 04:41 PM

Hello everyone,
Just bought this preamp on ebay as a non-working unit. It powers up, everything lights and works, but when a source is connected to either the AUX ou TUNER inputs, there's no sound.

The tape inputs, both TAPE 1 and TAPE 2 work fine. I currently don't have the schematics. My guess is that it could be either a bad solder joint or a transistor? Can I test the transistors in the circuit or should I take them all? Sorry for the limited knowledge, any help will be appreciated. Thanks.

sreten · 7th April 2009, 06:10 PM

Hi,

Check that the tape monitor is not engaged and that a permanent
out-in loop (e.g. for a equaliser) is either bypassed or connected.

/sreten.

cchean · 7th April 2009, 06:30 PM

Already did. The tape input is fine, when I disengage the tape loop and select to either tuner or aux, it does not work.

7th April 2009, 04:41 PM	#1
cchean diyAudio Member Join Date: Dec 2008	Technics SU-A8 preamplifier, no sound, help please! Hello everyone, Just bought this preamp on ebay as a non-working unit. It powers up, everything lights and works, but when a source is connected to either the AUX ou TUNER inputs, there's no sound. The tape inputs, both TAPE 1 and TAPE 2 work fine. I currently don't have the schematics. My guess is that it could be either a bad solder joint or a transistor? Can I test the transistors in the circuit or should I take them all? Sorry for the limited knowledge, any help will be appreciated. Thanks.

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7th April 2009, 06:10 PM	#2
sreten diyAudio Member Join Date: Nov 2003 Location: Brighton UK	Hi, Check that the tape monitor is not engaged and that a permanent out-in loop (e.g. for a equaliser) is either bypassed or connected. /sreten.

7th April 2009, 06:30 PM	#3
cchean diyAudio Member Join Date: Dec 2008	Already did. The tape input is fine, when I disengage the tape loop and select to either tuner or aux, it does not work.

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