Marantz PM7200 Can't adjust Idle Current or DC Offset

[mossieurclo]

solved

After i repaired the speaker protection board of that amplifier, all was ok.

So I then proceeded to adjust iddle current, got it, then DC offset. Oh, bboy.
[...]

Summing up how that problem was resolved (thank you to all who contributed!!):

I replaced fusible resistor 3315 that had gone very high.

And lowered 3301 (and 3302) to 220R to bring DC back within adjustable range (7267 and 7268 having drifted?)

Now will be replacing lots of electrolytics, all other fusibles, and putting back 7289 that i blew up (remember: discharge those Caps!), to reenable Protection. Looking for that 2SA970 and other through hole legged critters i discovered that these are now really scarce, like in hard to find.

Are NTE replacements viable??

 

[wiseoldtech]

I've never had an issue with ECG/NTE replacements after doing professional servicing for decades.
My shop always had a plentiful stock of those on hand.

 

[mossieurclo]

I've never had an issue with ECG/NTE replacements after doing professional servicing for decades.
My shop always had a plentiful stock of those on hand.

Ah, the voice of hope. From a trust inducing pseudo with an ideal resumé in signature

And (i just checked) it would seem they even have matched pairs

Whats not to like (if you don't have to buy 1000?)