spritzer

Happy Birthday my friend!!!

Nope, just a bad amp and bad headphones. Both go on my "worst shit Stax have ever made" list.

These will be used in some future amps.

Yup, the power supply got a bit toasty....

Well they do sound like shit. The cRaptor is pretty abysmal (so is the B52 which is the same thing) and the HR-2 is an utter dog. Let's not get into the A-10... With the portable stuff, there was one of them that clocked a THD of 20+% at the normal IEM load. Yeah, that's pretty much the definition of crap.

Too many possibilities as to what is wrong. The pot on the small board is to adjust the LV supply. Really the balance of it.

The conductors are too small to let the bass molecules though...

It has larger PSU caps.

It's a common issue with the Hv and nothing to worry about. You can put in larger PSU caps on the LV side which makes this go away.

It's practically legal up here. You always need a handshake between the two components to make sure you don't do anything "wrong" with the signal. Sony did it with some of their stuff but most had to resort to special connections.

There are these things call torrents where you can get all the SACD's you'd want. Also no SACD player would ever output digital in any useable format. Ohh and Lampazitor is pure and utter crap.

Carbon resistors way out of spec?

This is Stax so serial numbers have always been meaningless. They are just a rough guide, nothing more.

Measuring before the ballast resistor will give the correct value unless the meter is seriously fucked. This is high voltage so using a quality meter is the rule here.

Are the heater wires tightly twisted and kept away from everything else?

What do you mean by IEC neutral?

Are the 120V primaries cut in some way? A fried transformer is not all that common a fault.

Did you fix the primary setup? The way it is set in those pics it won't work at 230V.

You shouldn't see any DC on the output since you can't adjust the amp that way. It is AC coupled so no DC should be on the output.

Ahh that is not the best idea.

Ahh never mind, the last pic is from a SRM-Xh. See it now.

Change the regulator? That shouldn't happen at all.

JRC

True story, at collage we had this meter to measure our lung capacity. As was so often the case I was used as a Guinea-pig for some experiments and the last one was total lung capacity. I broke the meter....

I would never touch ST regulators....