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what load are putting on it? it is possible you are shorting to ground on the outputs via speaker wire there are several other clear possible problems but I'd take a look there first

is the board broken into many pieces??

You should check the "fuse" resistors and vf1212 double diodes. Caps aren't really the main failure with these wonderful units - the FRs are!

Does anybody know what is the best option for this part off hand? Thanks

Anybody know where the DRM guy is?

Hey - tried searching and couldn't find a thread of workbench setup pictures. Is there one??? Thanks Rob

Yes! There are modern equivalents

Measure the resistance of the fuae resistors on the driver boards

Sounds like you could do the work.

If you replace the transformer(s) with the appropriate replacement you won't need a step down

No. Internal pictures of the unit.

Wooohooo! Good karma prevails again.

YES - Get the other power transformers

Overall it sounds like the protection isn't working at all. I would not recommend powering it at all until you have a better idea of what is going on.

Pictures are useful also.

How about running line level into the power amp in (with the selector set to separate the pre/power) to see if you get output?

The clip locks one way. It will go on the other way but it does not clip. Thus polarity is not enforced and that causes a protect

If you have the driver inputs reversed it will stay in protection

I would adjust for a lower DC offset and hook it up

So did you get output?

based on that - i'm not sure how both channels worked. It's not possible with a fuse missing in that location and a stock circuit

Let's see the bottom of it

this is the one with the crazy cap added too! should have never been played probably has a blown power transformer and now blown OPTs

post pictures of the bottom side. Did they jumper it all onto one transformer? jumper the fuse?

with that fuse missing one of the transformer primaries should be open and a channel should not function. I would proceed with extreme caution with this amp if it exhibited that behavior pull the power/protection board out and post some pictures of it