PART ID PLEASE

[Kenneth G. Gordon]

On 8 Aug 2009 at 9:17, Ronald Carlson wrote:

> Al,
> 
> If the specifica transformer can't be found then some estimates can be
> done to get a transformer that will get the unit working again.  From
> the schematic I would spec this transformer as: 
> 
> Primary 110VAC Filament secondary 6.3VAC 500mA (315mA calculated load)
> Plate voltage secondary winding 150 to 177 VAC calculating ideal half
> wave output with no drop through the two series resistors.  Given the
> inefficiency of a half-wave and filtering something like 175VAC should
> work.  100mA ought to be sufficient.. 

Again, your calculations almost exactly mirror mine, which I sent to Ray 
privately this morning.

I have the manual for the SG-8, which appears to be very close to the SG-7. 
The voltages listed for the tube plates are between 75 and 85 VDC.

The HIGHEST voltage shown is 85 VDC.

So, your estimate is entirely consistent.

Ken Gordon W7EKB

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