Ignore, rooky error- Pioneer SX-626 sweep frequency response
Hi All
IGNORE below, probe was on 10x Aaaarh!!! Lol. Cannot seem to delet a post ?
A neighbor has asked me to have a look at his old Pioneer SX-626. Nice old amp, like the satin finish.
It had a blown protection fuse on one channel and after replacing that I checked some voltages which all seem fine, AM/FM seems to work also. Dim bulb no issues. When I feed in a signal and increase the volume to say 5-10 Volts RMS at 10kHz it looks clean on the scope. Problem is if I then do a sweep (or change the frequency) from 20Hz to 20kHz the amplitude varies enormously from about 1V right up to clipping ? I can't recall which end it clips, I need to setup again. I should point out all the transistors on the amplifier section appear ok but I am yet to check all the capacitors. I was just wondering what the likely culprits might be ?
Any help appreciated
Cheers
Richard
Hi All
IGNORE below, probe was on 10x Aaaarh!!! Lol. Cannot seem to delet a post ?
A neighbor has asked me to have a look at his old Pioneer SX-626. Nice old amp, like the satin finish.
It had a blown protection fuse on one channel and after replacing that I checked some voltages which all seem fine, AM/FM seems to work also. Dim bulb no issues. When I feed in a signal and increase the volume to say 5-10 Volts RMS at 10kHz it looks clean on the scope. Problem is if I then do a sweep (or change the frequency) from 20Hz to 20kHz the amplitude varies enormously from about 1V right up to clipping ? I can't recall which end it clips, I need to setup again. I should point out all the transistors on the amplifier section appear ok but I am yet to check all the capacitors. I was just wondering what the likely culprits might be ?
Any help appreciated
Cheers
Richard
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