[Milsurplus] [spam] Behlman AC power source?

[Michael Hanz]

Behlman has been the Lexus of variable frequency power sources ever 
since the 1960s.  The 25-C has a power rating of 250 V-A but are *very* 
conservatively rated, able to put out 150% of rated load continuously if 
you can tolerate more harmonic distortion in your load.  The C models 
are were made in the 1970s and 80's IIRC, eventually replaced by 
basically the same thing but with more modern power transistors and a 
digital meter.  I still have a 100-C that has a single 400Hz frequency 
plug-in, and a 50-C with a 45-2000Hz variable oscillator.  I've used 
them for twenty years working on my equipment at aafradio.org.   I 
bought both of them on ebay for parts but found that they were easy to 
repair.  The 50-C "parts unit" is pictured below, and I primarily use it 
for the WW2 Navy 800Hz equipment.  I'm partial to the C models because 
they use an analog voltmeter.  They are modular in design so that with 
additional power transistor banks they can get up to quite high current 
outputs.  I have a some spare parts for the C model if you need any.

Mike  KC4TOS

On 4/9/2026 6:18 PM, Gary Hitchner via Milsurplus wrote:
>
> Is anyone familiar with Behlman AC power sources?   There is a Behlman 
> Model 25-C on Facebook marketplace.
>
> I don’t see a manual available for this. Would this be a good 400 Hz 
> power source for WWII avionics?  Looks like the AC output voltage is 
> adjustable.
>
> Gary
>
> WA2OMY
>
>
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