[Milsurplus] AN/SRT-4A Marine Transmitter

[AKLDGUY]

The most appropriate choice might be the 1626. It even has a 12V heater.
But it would just look odd sitting in there with the three remaining 6AQ5s.
Then the question becomes, what suitable PA tube has a structural
appearance that looks right with the 1626 and can deliver about 10W? Must
have the plate and grid brought out at the bottom, no top cap.

Neil ZL1ANM


On Saturday, August 18, 2018, Bruce Gentry <ka2ivy at verizon.net> wrote:

> 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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