spritzer

Yup R7 and R8 form the adjustable cathode resistor which is used to zero out the DC offset. Same setup as is used in the Stax SRM-T1 and SRM-007t amps amongst others. DC offset is the great enemy here as while the drivers are fine with it in theory, it kills the voltage swing. Single Power ES-1/2's had an offset of 100+V and the difference is quite startling once you get rid of it.

Extra load on the system would cause the voltage to sag a bit so that could be the issue.

Overheating isn't the issue here but rather the DC offset rising too much. That is naturally tied to the temperature of the amp but the wall voltage is a much bigger factor.

There should be two zeners in the input stage per phase.

I think my F5 is in a 3U box from Modushop...

I don't really see any need to swap out the 2SC5466's. Their only "problems" are the low operating voltage and that they are pretty hard to find. I used them in my SRM-1 Mk2 rebuild just because I had them at hand and none of the what Stax did use back in the day. You should use metal films for the mod, 1/4W and rated at 350V is more than enough. I used Vishay RN60's because that's what I had at hand and they are hard to top.

Brilliant news. Time to do some more soldering, hell I might be able to finish the KGST before the SR-009 gets here...

Now I just need to find a 6800uf/450V cap just to be sure...

It's always so reassuring to see all those HV parts in a LV circuit.

If you want a Surrounder then drop Doug a line. I know he has one and is looking to sell it...

I got my screws here with no export issues. I also don't see any reason why 8A diodes shouldn't work but lets wait for Kevin to chime in.

It should.

Ok, that's just porn for me. Construction is basically identical to the SR-007, driver enclosed in a resin frame but with the old Lambda style solder contacts. Box is the same design as the SR-Omega...

Nope, the SRM-600 should outperform it.

Happy birthday fellow Tannoy owner...

Looking at the pics I really should do the Exstata V2 treatment to the HV boards as well. So much unused space but no free time...

RF then...??

You know you'll have pictures from me of the SR-009 disassembled very soon after I get them. Perhaps that will help...

The T2 will make your Omegas also act like speakers...

I'm so in but retarded restrictions on moving money out of the country delayed the wire until Monday. As for whole "how loud they sound" means nothing as pretty much any of the Stax amps will make the SR-007 or SR-Omega shockingly loud. Sensitivity is just that, how loud they will be at 100V RMS but it says nothing about how the amp handles the load. Remember people, the voltage is the easy bit...

Nope, we didn't have that one. Could be a variation of the SRM-3 circuit (i.e the SRM-Xh with a full size PSU) so it will be interesting to see.

I so want that picture with a stack of SR-009's!! Time to get back to work on the T2...

You can always fit mini XLR's which do fit perfectly in the stock Stax RCA holes... The SRA-14S is one of the few amps that I haven't bought and set to KG for analysis so it would be great to see the schematic.

I might be in as well. I'll let you know ASAP!!

I've never tried the SRM-600 so I can't comment. The 507 was just fine with a SRM-T1 modified to be similar to the SRM-600 it just how similar I don't know.