EL34 Grid Stopper resistor

[ca7922303]

Sent a new pic with blue and green points to measure

Remove one leg each of c16/c36?

[catalin gramada]

No, you must be able to broke thr nfb loop meant disconect nfb resistor. At the injection point or at OT output, is equal.just need to open the circuit. Unfortunately I don.t see what is in the other end ? The sheets is too confused to me. Maybe put a picture of the board of those area.

[catalin gramada]

You may try to desolder whatever is soldered on green and blue point. Heat a bit try to straight the ends and push the terminals through the board. I think you.ll be able to recover the component from chassis and you will solder it on the top in case you reconstruct the circuit as original

[ca7922303]

You may try to desolder whatever is soldered on green and blue point. Heat a bit try to straight the ends and push the terminals through the board. I think you.ll be able to recover the component from chassis and you will solder it on the top in case you reconstruct the circuit as original

Desoldered green and blue points, pushed a straight pin thru each hole, but still reading 0.00 ohms. Blue point to c16 on trace reads(0.00 ohms). Green point to end of trace connects to midi board and reads(4.49k ohms). Photo

[ca7922303]

No, you must be able to broke thr nfb loop meant disconect nfb resistor. At the injection point or at OT output, is equal.just need to open the circuit. Unfortunately I don.t see what is in the other end ? The sheets is too confused to me. Maybe put a picture of the board of those area.

Also, found a 22uF 450v capacitor spare.

[catalin gramada]

Desoldered green and blue points, pushed a straight pin thru each hole, but still reading 0.00 ohms. Blue point to c16 on trace reads(0.00 ohms). Green point to end of trace connects to midi board and reads(4.49k ohms). Photo

What component was there 100k resistor ?

[catalin gramada]

If you measure resistance between blue point and ground you should be able to read 4.7k , is this correct ?

[ca7922303]

What component was there 100k resistor ?

Dont have a component dropping underneath board. Didn't hear drop and shook chassis back and forth, nothing came out. Readings stayed the same (0.00 ohms).

[ca7922303]

If you measure resistance between blue point and ground you should be able to read 4.7k , is this correct ?

Blue point and ground(4.5k ohms).

[catalin gramada]

Ok power on the amp and see if osscilate

[ca7922303]

Ok power on the amp and see if osscilate

Amp on, continues to oscillate.

[ca7922303]

Ok power on the amp and see if osscilate

I can remove board to see underside of necessary?

[catalin gramada]

One sec. Can you see the OT output wires and where the go to the board ?

[ca7922303]

One sec. Can you see the OT output wires and where the go to the board ?

I'm going to upload some photos I have of the underside of board previously, see if that helps.

[catalin gramada]

Disconect common black wire OT common output from where it is. Tie the black common wire in the red point.