Edgar ST-70 new construction

[gerrittube]

And, you also get the advantage that all the magnetic fields of each magnetic device is conducted to all the other magnetic devices. Hmmm, Buzz, squeal.

Exactly! That’s why I use mainly 4 mm thick aluminum and sometimes 3 mm thick for smaller pieces.

Regards, Gerrit

 

[zdenoeddie]

It's alive!
I finish 1 channel, measured 33W output power before limitation.
I used ECF82 instead 7199, set around 85V on anode and balance with trimmer on g2 of pentode (thanks for hint). Now I need do the same, but also with painting, for the 2nd channel. 😎

 

[zdenoeddie]

Just for information, this amp works well 2nd year now... without any problem, so I just recommend ECF82 replacement. Go for it 🙂

 

[prairieboy]

Good question.

With so much better front ends than the ST70 i see little point. My ST70s (both broken) got turned into the 1st DYnaMutt and it is a temendous amp. You would likely have to directly contatc Gregg the Geek to get more detailed info.

dave

I have the same Dynamutt board in my ST-70 redux and it's great. I agree, if you can source the boards (I could send you the documentation) do it.

 

[rsumperl]

Hello everyone,
Does anyone have any contact information for Gregg the Geek?

Thanks
Ray

 

[Ray Waters]

http://www.classicvalve.ca/contact.shtml

 

[rsumperl]

http://www.classicvalve.ca/contact.shtml

I contacted them a few months ago, apparently him and his partner split and the partner has the board layouts.
I purchased several boards from them 5 or so years ago, I lost track of where I stored them!