New to me 610II - Distortion

[Kapco]

With the 2014i have 67 v on all three leads of both TR572 & TR573

 

[avionic]

With the 2014i have 67 v on all three leads of both TR572 & TR573

Do you have replacements for both ?

 

[Kapco]

Do you have replacements for both ?

I have a 2N5401 I could replace TR573 with? I do have another 2SD2014 and the original D476A which I could put back in. It might be still good

 

[avionic]

I have a 2N5401 I could replace TR573 with?

Would work .. The pin out is EBC for the 2N5401

the original D476A which I could put back in.

Check it for shorts with your meter before installing it.

 

[Kapco]

Would work .. The pin out is EBC for the 2N5401

Check it for shorts with your meter before installing it.

I just pulled both transistors out and tested them for shorts. Seems ok on both. Originals test ok too. I'll put them in and recheck voltages

 

[avionic]

When you get a chance. What all have you replaced in the power supply so far ?

 

[Kapco]

When you get a chance. What all have you replaced in the power supply so far ?

D571, c572&573, D572, C576, D573, C579,C580. I had replaced TR572& TR573 but just put originals back in.

 

[Kapco]

Just tested with original transistors in...relay works now....but....I have Zero volts on all legs of both transistors now

 

[Kapco]

Just tested with original transistors in...relay works now....but....I have Zero volts on all legs of both transistors now

Wait..meter issues again....one sec

 

[Kapco]

Wait..meter issues again....one sec

Ok..all voltages on TR472&473 ok. Going to hook up scope and see what I have..of anything good....

 

[Kapco]

Same thing...no difference to output. Same situation as my video many posts ago.

 

[Kapco]

Rechecked TR 571, Tr481 & tr482. All good

 

[Kapco]

Would bad VR481 &VR482 cause this issue?

 

[avionic]

Are you seeing -42v at the junction of R577,R578 abd D577?

 

[avionic]

Would bad VR481 &VR482 cause this issue?

In the power supply..No..

 

[avionic]

Need to get the power supply sorted out before even looking at the amplifiers.

 

[avionic]

Same thing...no difference to output. Same situation as my video many posts ago.

Would bad VR481 &VR482 cause this issue?

What do you think the chances are of both trimmers causing identical failure in both channels ?

 

[Kapco]

Are you seeing -42v at the junction of R577,R578 abd D577?

Yep...I have the -42v at the junction. If I check the voltage between D577 &D578 I get -21, and if I check after D578 I get 0v

 

[Kapco]

What do you think the chances are of both trimmers causing identical failure in both channels ?

Good point....

 

[avionic]

Check fusible resistors FR481 and FR482.. With these power supply issues they may have taken a hit.