I bought this amp head knowing it had undescribed issues needing attention.
At idle I see around -34 VDC at the output jack with no load, and around -25 VDC with a 8 ohm dummy load
This amp has two 6800 uF filter caps and one bridge rectifier. I have attached the schematic which I think may be the correct one.
Still trying to learn solid state amplification workings.
I can see work had been done before on the amp board. See pics.
This schematic shows a + and - 34 VDC rails at the output jack. Does this mean there should be 0 VDC at the output jack? And it looks like the 5W 22R at the output was a replaced component along with some messy work on the underside. Don't care for all the glue on the top and bottom side.
I have plus and minus DC on the relative rails.
All four 0.33R 10 watt are showing negative VDC (in the -27 to -30 range).
Looks like one of the final 5 output transistors has been replaced. The other four are Toshiba Japan
The entire amp is showing a current draw of about 1.25A at the variac meter.
Need guidance. Thank you, Mark
At idle I see around -34 VDC at the output jack with no load, and around -25 VDC with a 8 ohm dummy load
This amp has two 6800 uF filter caps and one bridge rectifier. I have attached the schematic which I think may be the correct one.
Still trying to learn solid state amplification workings.
I can see work had been done before on the amp board. See pics.
This schematic shows a + and - 34 VDC rails at the output jack. Does this mean there should be 0 VDC at the output jack? And it looks like the 5W 22R at the output was a replaced component along with some messy work on the underside. Don't care for all the glue on the top and bottom side.
I have plus and minus DC on the relative rails.
All four 0.33R 10 watt are showing negative VDC (in the -27 to -30 range).
Looks like one of the final 5 output transistors has been replaced. The other four are Toshiba Japan
The entire amp is showing a current draw of about 1.25A at the variac meter.
Need guidance. Thank you, Mark
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