[R-390] R390A P-P audio circuit

[Perry Sandeen]

List,
 
A while back I was working on a project that would
put the two chokes from the R390a audio deck behind the power transformer and
then re-build the AF deck to have a push-pull 6AQ5 output circuit with a
quality audio transformer.  This would
also leave space for a MOSFET B+ regulator.
 
The audio circuit is based upon the Kleronomos
audio mod. Mr. Kleronomos used to do this mod as a side job.  Now he has become a SK so anyone building
this circuit would not deprive him of any income.
 
The mod I designed requires a total re-work the R-390
AF deck.
 
Like a few other of my projects I have run out of
time to complete this.  It is not a
complete how to do it project. It is mostly done design wise.  I had started to do the project but it is now
in limbo.
 
If anyone wants a copy of the project (8 pages with
photos as a PDF) please do an original email off list and I’ll email you a
copy.
 
Regards,
 
Perrier