The stock PT2500 blower was a shaded pole motor. Very similar to the
NCL-2000 fan setup. I bet the motor is available from WW Granger, and
may be also available in 240 volt from them. Their on-line data sheets
are very good and accurate.
73, Jim W7RY
On 1/6/2022 2:35 PM, Roger Parsons via Amps wrote:
Unfortunately, I am sure. However, the schematic implies that the plate
transformer is tapped. I will have to investigate further - the wiring and lack
of labelling makes it quite clear that this was a prototype!
I would still like to know if the original fan (possibly the same as the
PT-2500) is available anywhere.
73 Roger
VE3ZI
Are you sure? Its not connected across one of the 120 volt windings on the
plate or filament trnsformer?
Or is this amplifier 240 volts only?
You can always install a small 240-120 volt 3 lead isolation transformer
available from Mouser.
73, Jim W7RY
On 1/5/2022 8:51 AM, Roger Parsons via Amps wrote:
Preferably a 240V version as the current 120V one is connected_*between live
and ground...*_
TIA
73 Roger
VE3ZI
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