[Milsurplus] Tube ID ?

[Kenneth G. Gordon]

On 15 Jan 2018 at 20:56, Mike Durff via Milsurplus wrote:

> 
> Looking at the 1958 Amperex book and cross referencing that with Frank's tube 
> data. It appears to be an HF-300. 

>From you dimensions, that cannot be an 810 then, and your H?-300 and subsequent info 
means that is an Amperex HF-300 all right.

According to my Amperex book from 1958, that requires 11 V at 4 Amps for the filament.

Typical operation is 3 KV plate voltage at 250 mA, or 750 watts input and 600 watts output.

Plate dissipation rating is 200 watts.

> 
> Their data says it substitutes for the older 204 type. 

That is interesting: the 204A was designed to be mounted horizontally in a special set of 
sockets, one for each end. Plate dissipation rating for the 204A is 250 watts.

Anyway, it looks to me like you have an HF-300.

Good.

Ken W7EKB

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