[Boatanchors] Collins C-200 tube

[Donald Chester]

On 1/24/2021 8:58 AM, Larry wrote:
> I have one of these C-200 tubes.? I'm not finding reference to
> it on the internet.? One site mentions the C-100 and
>
> the Collins 30FXC transmitter.? Another shows the C-204 etc
> tubes but nothing so far on the C-200.? Not even a date.
>
> It has a 4 prong base and the grid comes out the side of the
> tube.? Bigger than the 813 with a large plate cap on it.
>
> Anyone with specs or info?
>
> Larry W0OGH

It is probably a Collins rebranded Amperex HF-200 or Taylor T-200.  As I recall they used HF-300s in one of their broadcast transmitters  circa 1939 and called them C-300s.  Taylor made a version of the HF-300  with a slightly heavier filament called the T-300.

The number does not necessarily indicate the plate dissipation.  The HF-300 is rated at 200 watts plate dissipation.  The HF-200 is 125 watts as I recall.  The Taylor T-200 is very similar to an 810.  The filament voltage may be 10 or 11 volts.

Look up any data you can find on the HF-200 and T-200 and see if your tube looks like one of those.

I use a pair of HF-300s in the push-pull final of my 80/75m transmitter.  I may have a HF-200 round here somewhere.

Don k4kyv