[Hammarlund] Super Pro bias supply

[Al Santangelo]

OK then, so the AF driver tube would draw way more current and the
primary of the driver transformer would fail then because of the lack
of bias from the supply and or the resistor divider chain changing
values etc. and the max current rating of the primary of the AF
transformer would be exceeded.

Al Santangelo

On 25/07/2012, Bill Cromwell <wrcromwell at gmail.com> wrote:
> 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
>
>