http://img230.imageshack.us/my.php?image=ampfronttp2.jpg
http://img230.imageshack.us/my.php?image=ampbackdb3.jpg
http://img401.imageshack.us/my.php?image=ampinsidehk7.jpg
It's almost finished now, I have to replace some improvised resistors, close openings at back and paint OPTs. PSU is not finished yet.
There is absolutly no hum or buzz coming out of speakers. I discovered today that mains transformer is giving out 6,7V instead of 6,3V
. I will put NTC resistor in series with heaters for soft-start and I hope the voltage will than drop at correct value.
Something is wrong also with bias, the current at 300V line is 80mA (both chanels together). I think it should be somewhere around 105mA (48+48+3+3). I hate unadjustable bias
http://img230.imageshack.us/my.php?image=ampbackdb3.jpg
http://img401.imageshack.us/my.php?image=ampinsidehk7.jpg
It's almost finished now, I have to replace some improvised resistors, close openings at back and paint OPTs. PSU is not finished yet.
There is absolutly no hum or buzz coming out of speakers. I discovered today that mains transformer is giving out 6,7V instead of 6,3V
. I will put NTC resistor in series with heaters for soft-start and I hope the voltage will than drop at correct value.Something is wrong also with bias, the current at 300V line is 80mA (both chanels together). I think it should be somewhere around 105mA (48+48+3+3). I hate unadjustable bias
- Status
- Not open for further replies.