[Hammarlund] Super Pro bias supply

[Bill Cromwell]

On Wed, 2012-07-25 at 07:16 -0400, Al Santangelo wrote:
> OK on the further information.
> So then, what is the connection between the failure of the
> -50v bias supply and the failure of the audio driver transformer that
> I've read about?
> This bias supply is not connected at all to the audio driver
> transformer ie.T7 in the SP-400X receiver. Thanks.
> 
> Al Santangelo
> ______________________________________________________________

Hi Al,

I went to BAMA and snagged a copy of the manual. If the bias supply
fails the audio driver will turn full on (zero volts at the control
grid) and it gets it's plate voltage through that transformer. The
transformer will be ruinated. You can't stuff tens pounds of baloney in
a one pound sack.

73,

Bill  KU8H