[Milsurplus] AN/SRT-4A Marine Transmitter

[Kenneth G. Gordon]

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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