[ARC5] Receiver Tube Substitution

[Kenneth G. Gordon]

On 19 Dec 2016 at 16:56, gordon white wrote:

> There was a mention a few days ago about converting Command 
> receivers to higher frequencies. For what it's worth, the RAT receiver 
> that covers 20-27 mc has a tube lineup of 12K8, three 12SK7's a 
> 12SR7 and a 12A6.
> 
>     This lineup is identical to the 190-550 kc AN/ARC-5 receiver
> 
> These tube ID s are engraved in the black wrinkle paint under the 
> tube cover.

In point of fact, Gordon, I used your old article "Command Receivers for All Frequencies: the 
Easy Way". to finally get the BC-454 working which I own which had been "converted" to 
cover 27 - 30 MHz back in 1950 or so.

The coils which were in it were so far off of what they should have been that the original 
conversion never would have worked.

I used your data to wind coils which finally DID work.

The tuning capacitor had been so badly torn up that there was not enough Delta-C to 
enable coverage of 27 - 30 MHz, but it DOES cover from -28 to 30+ MHz now just fine.

And the tube lineup remains exactly as your RAT has.

The receiver works very, very well at 10 meters.

Ken W7EKB

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