Were these measured in circuit ?
No, all measurements were out of circuit.
Were these measured in circuit ?
No, all measurements were out of circuit.
Just finished checking the left channel. I checked all the same components as I did on the right channel. It's doesn't look as bad as the right channel.
There are two shorted outputs - one 2SA909 and one 2SC1586. Also, R156 is measuring 35 Kohms. It's supposed to be 0.47 ohms.
Before I put in my parts order, is there anything else I should check?
Is there anything else I should replace just as preventative maintenance?
I'm willing to spend the time and money to get this amp as close to 100% as is practical.
Reguardless what they measure. I´d still replace all the small electrolytics.
Hello
Be very carefull with pin configuration
see my picture if you have a doubt . This is true for both types
Double check all fuse resistors EVEN if they "look fine"
Are you shorting (jumpers) the inputs to insure they are at zero?
And I wouldn't be surprised if some of the trim-pots are shot.
Replacing TR101 and 102 in both channels with closely matched (Hfe) transistor may get you closer to 0.00 mv of DC offset. The higher the gains the better, matched of course. Might have to get 20 or more.
512-KSA992FBU
I get them in the TA packaged. Then check each one and write the gain numbers right on the tape.
BTW these are not A992's
Replacing TR101 and 102 in both channels with closely matched (Hfe) transistor may get you closer to 0.00 mv of DC offset. The higher the gains the better, matched of course. Might have to get 20 or more.
512-KSA992FBU
I get them in the TA packaged. Then check each one and write the gain numbers right on the tape.
BTW these are not A992's