[Milsurplus] Navy MAK

[B. Smith]

I would use one of those NARCO power supplies with audio modulator built 
in and modulate it that way at a lower power. I think I have one somewhere.
k4che

On 5/24/2019 2:18 PM, Ray Fantini wrote:
>
> I looked for the manual, but it's not in my residence, so it's been 
> moved to storage, and this will have to wait until summer.
>
> When I owned the set, I looked into tube substitutes, such as 807, but 
> I don't recall at all my conclusions.
>
> When this set was discussed here a few years back, a caution was 
> mentioned. There was some kind of potential problem ( no pun ) at the 
> power connector
>
> under something like ? high modulation and ? maybe incomplete loading. 
> The problem was arcing at the power connector.  Did this caution come 
> post - manual
>
> - publication and appear in that Navy volume on equipment maintenance 
> and typical problems ? The same manual that has items like the TBX 
> frequency range
>
> increase ? Robert will know the name of that book.
>
> -Hue
>
> The 807 and the 1269 share the same base and pin out.
>
> The modulation system is somewhat strange being the plates of the 
> modulator are connected to the RF decoupling choke at the input of the 
> PA, the original power supply had a modulation reactor in series with 
> the high voltage output to prevent the output of the modulator being 
> dissipated across the HV filter capacitor. So will have to use an 
> external modulation reactor in order to get any AM at all. Too bad 
> they did not separate the modulator HV and the PA HV being that way 
> you can use an external transformer. The current design puts a hell of 
> a stress on the insulation of the cable between the radio and the 
> power supply.
>
> Ray F/KA3EKH
>
>
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