[Milsurplus] AN/SRT-4A Marine Transmitter

[Bruce Gentry]

Consider a 6CG7 or 12BH7 with both sections in parallel, or a 6S4 or 12B4.

      Bruce Gentry, KA2IVY


On 8/17/18 4:22 PM, Kenneth G. Gordon wrote:
> On 17 Aug 2018 at 14:21, AKLDGUY wrote:
>
>> OK, thanks. I asked because I've used a triode-connected 6AQ5 as the oscillator in my SCR-183
>> transmitter (BC-AO-230) model, as recommended by David Stinson. Stability has not been great;
>> it warbles around the intended frequency. I considered changing to the 6C4, which I thought
>> would be a fine oscillator, but David recommended against it.
> OK. I remember that exchange with David. As I remember it, the 6C4 simply wouldn't put out
> enough power. The 6C4 was used by many receiver manufacturers, (Hammarlund and
> Hallicrafters for two) as the HFO, but that use needs very little output power. 1 to 2 volts RF
> usually is enough.
>
> A triode-connected 6AQ5 should be able to output quite a bit of power for its size.
>
> Perhaps we could revisit this issue and come up with a better sub for the original tube.
>
> I am certain that there is at least one other triode, or triode-connected tube, which would
> provide the necessary drive-level to the final, yet be stable too.
>
> As I can, I'll look into that.
>
> I'll begin by looking back to David's experiments with that oscillator.
>
> Ken W7EKB
>
>
>
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