mdr30

I got the NAD20, are those the same drivers? Doesn't sound too bad but not good enough to spend too much time on. Not Stax pinout. What about the diaphragm specs?

Nothing stopping starting a new, often helpful in builds.

Thanks for info - seems the voltage was just at the limit of the regulator's range. Changed back to original 1,5K resistors (from 1,8K) so now DC out is 19,5V (before 21,5V) from a AC18V transformer. All leds are on. Problem here is the mains moving from 210 to 230V and those swings seem to affect the whole GRLV system.

Leds close to big caps light up, then dies. Same thing when powering up once again. Other leds unaffected. Amp boards OK (Dynalo). Any ideas what it could be?

Is the amp sensitive to pulling the headphone plug while playing?

Got a regular 24v psu (no minus voltage), 100k vol pot and a small case. Best amp to build?

Do MPSA06/56 work for the output stage or do they burn? Any MPSW06/56 stashed away?

I'm tempted to build this to get an amp that can drive my old orthos once and for all. Does anybody have boards, and is there a one box compact version?

Has anyone built this balanced beast and tried it out?

Thinking wear and tear. Don't want these pairs of 3pin xlr anchors hanging down my neck.

Anyone tried a mini xlr as headphone out?

Is this amp powerful enough to drive vintage orthos, insensitive beasts - often heavily damped as well - that crave current?