[ARC5] SCR274 improved with zener or glow tube?

[Dennis Monticelli]

I use a stack of two 105V reg tubes to regulate the osc.  I find that
regulating the PA screens made a substantial improvement also.  Regulating
the plates of the PA less so.

Dennis AE6C

On Sat, Mar 19, 2016 at 6:35 PM, J Mcvey via ARC5 <arc5 at mailman.qth.net>
wrote:

> I have been thinking of how to further iron the chirp out of my CW on the
> 12V converted system.
> Getting a better 12 dyno helped somewhat, but there is still more chirp
> than I want to hear.  In fact I'd call it more of a slur or whoop.
> The first key down is the worst, but if I keep a steady CW flow going, it
> averages the supply voltage and it sounds better.
>
> One of the non-standard things here is that I use the leakage radiation
> into the rx to monitor. I can still do it this way when I get the modulator
> set up (28v) by simply omitting the sidetone cable for the bc456 that
> switches the audio. Good idea, or not?
>
> Has anyone tried a zener or glow tube to regulate the the OSC supply? Did
> it work?
> I have heard old MOPA rigs that only had a hint of chirp which is fine by
> me. How do I attain this goal?
>
> Jim, AC2EU
>
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