GM70 - Mono block project

[Nsaran]

Hi. This is my project from thailand.

Gm70. Run vp 1100v class a mono block

Saran audio - Gm70 mono block

Vivaldi violins concerto...

 

[Flikoman]

They are beautiful.

Driver tubes? B+ PSU is RC, LC? Output transformer?

Regards

 

[Nsaran]

I’m making it trees stage whit cca for pre stage 6l6 ot kt88 for driving past interstage transformers. B+ 110v and 6k output transformer. The interstage and out put transformers has been in thailand. It’s. Good fra from 15hz to 85khz with -2db

Thank you.

 

[H713]

Nice looking build. Reminds me of this future-but-never-going-to-happen 3-500Z push-pull monster amp. I mean, it's not a real tube unless it needs forced-air cooling, right?

I've always wanted to build a monster push-pull amp with transmitting tubes, but the OPT is really a barrier. Even an 811A or 572B (572B is pretty much a beefed up 811A), the plate voltage would be 1200v or so. My thinking is that the OPT would need to be insulated for at least twice that. I assume that the output transformer the OP used was custom wound. I'd be interested in getting more information on it.

 

[blu_glo]

Your local transformer winders will take insulation etc into account if you give them full picture -the big question is can you still safely use split layer windings?

 

[deafbykhorns]

About 90ma? Thats a great operating point for this tube

 

[djn]

Are you using existing schematic? How do they sound?

 

[Flikoman]

About 90ma? Thats a great operating point for this tube

1100VDC 90mA is a great operating point, but 1200V 80mA even better I know, first hand.

 

[Nsaran]

The sound is nice Wit vp 1100v at 65ma. Bias point I love i so smooth quite clean sound

The picture of my output transformer