Mjölnir makes high quality gear, this is their KGSSHV amp with normal bias from their website. There is at least one other company whose name escapes me at the moment (try Google). A good start would be contacting Mjölnir (@spritzer here), he might be able to provide normal bias for their other...

Mjölnir Audio in Iceland has several models with regular bias, expensive gear though. A more economical option would be having an electronics tech modify a Stax amp to provide normal bias. This is just changing several resistor values so the costs should not be outrageous. If you have any...

The T1 series and some SRM-006t & SRM-007t's had normal bias available. You can also find normal bias on some very good third-party amps. Or possibly have someone modify an amp to provide normal bias, not a difficult mod for someone who knows what they are doing.

You should be fine. Not to say that you weren't lucky, don't try for a repeat performance. But if something was to break it would most likely have done so on impact. It would take significant flexing of the housing to damage the membrane. You have no channel imbalance, let it go and enjoy your...

Thanks for double checking. I wouldn't be too quick to trust the T1 schematic, a few changes would render it less than useful for troubleshooting. If it was in front of me, a scope and curve tracer will reveal most issues. Sometimes you need to refer to the actual schematic (if available) or...

Any other caps running warm/hot? Can you double check the original part values against the replacements? As you said two replacements for the 4700uF/10V running hot, could be excessive ripple current out of the supply.

The Panasonic part is a good quality cap. I can only speculate that there is another fault in the amp.Or soldering exceeded 350C/3 seconds. Thanks for the schematic but an approximation is not sufficient to attribute the temperature to circuit design.

That's suspect. Electrolytic caps can dissipate significant heat but they usually run cooler than that. The cap is rated to operate up to 105C, so that temperature by itself isn't going to cause a failure. But why is it so hot? It may be normal for this amp, hard to say without a schematic and...

It's more likely to be a cable or cable connection problem. But that doesn't mean that energizers never fail. Try putting some gentle pressure on the cable especially where it enters the phones or near the plug. A better test would be borrowing another energizer or having someone temporarily...

The devil is always in the details but my understanding is pretty much what you outlined. And one can only hope that someone on the forum might know of a better source for good quality parts. "DIN" is often misused in America to label almost anything metric or "foreign". Often inappropriately...

I don't believe so. If there are good sources for such, they are well hidden from routine searches. For good quality parts you're probably going to have to find a local 3D printer or machinist. For ready sources, not much other than Moon Audio, et al for the raw male plug. Which you could then...

@Degru The SRM-212 uses a 12 VDC, 400 ma supply with negative polarity i.e. the center pin in negative and the outer barrel is positive. You can and should use a larger current supply if you can. A 3A or 1A supply will likely perform better. I don't know the plug dimensions but it would...

A standard half-watt, single turn, through hole trimmer pot should be a proper replacement. Something like this Digikey part.

Bias voltage adjustment? I just acquired a SRM-1 Mk2 PP (C-series) amp complete with it's original caps. So while I have it open to replace the vintage electrolytics, I'd like to make a few mods e.g. add balanced inputs and (output) safety resistors which should be fairly straight forward. I'd...