[Boatanchors] Mod transformer for Multi-Elmac AF67

[rrkrr]

Roger,
It happens that I do have an AF-67 modulation transformer, which I'll be 
happy to send for the cost of shipping.
Have you checked the transformer that couples the audio driver stage to 
the grids of the push-pull modulator stage?  These are notorious for 
going bad, due to defective enamel wire insulation.  I'm not sure if my 
junker has one of those, but I'll check.  Also, the AF-67 used a 22 Volt 
battery for grid bias on the modulator tubes.  I've seen several schemes 
for eliminating this, one of which was to put a high wattage 22 volt 
avalanche diode between the cathodes and ground.

Bob K4ERR



Roger Basford wrote:
> Hi All,
>
> I picked up a fair to good AF67 yesterday at an auction and find it is 
> minus its mod transformer. Anyone have a junker TX with this 
> transformer in, or can recommend a substitute? Have got some 
> milsurplus gear with mod trannies for 2 X 6L6 into a 1625 but would 
> rather not butcher those.
>
> 73,
>
> Roger/G3VKM
>
>