Adjusting the "modulator tube filament rheostat" - 1925

[Sam KS2AM]

Another fine pic from Shorpy.

http://www.shorpy.com/node/16757

Click on the picture for more detail.

[W3GMS]

Very cool picture!  Thanks for posting it.

73,
Joe, W3GMS

[W2PFY]

Great resolution.I saved & printed it. You can tell he is a working engineer by the dirt or stains on his hands. Maybe he had to pull that carbon mic apart?

[AJ1G]

Wonder what type of transmitter that was - pretty advanced looking for so early on the vacuum tube era.  Must have used a motor generator for the HVDC - there is a field adjustment rheostat on the panel.

[KB2WIG]

I hope the Op finally figured out why he wasn't broadcastin'. The mic was still switched to Remote.


klc

[K9PNP]

10.?? VAC on filaments.  1400-1500 VDC on plates.  Agree he must be using a motor-generator for the HV.  Wonder what the ammeter in the upper left of the panel is for, as it shows zero??? 

Nice picture.  Likewise, I would be interested in knowing what the transmitter is.

[W2PFY]

10.?? VAC on filaments.

Lots of 11 volt tubes back then. Even the more modern HF-300 uses 11 volts and are in use at K4KYV station.

[W7TFO]

That looks a lot like a Western Electric 6A rig.  The right vintage, too.

73DG

[W3RSW]

Reading some more meters.
Yes, 11 vac on the filament
1500 Vdc on plate
 70 ma plate current
5 amps RF on ant

Osc fil. Voltage 9.5
Osc. Output 6 amps (?). Must be different Z than above since higher than final?
Ip 130 ma too (?)

Neat stuff.

[K1JJ]

I see they used the same barber in 1925...