[ARC5] SCR274 improved with zener or glow tube?

[J Mcvey]

Ok , that's good to know.  The 0c3 glow tube is rather large for my portable application. I might have room for two 108V 0B2's .However the simplest one to implement may be this:http://www.newark.com/on-semiconductor/1n5388bg/zener-diode-5w-200v-017aa/dp/70K6988

  
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1N5388BG - ON SEMICONDUCTOR - Zener Single Diode, 200 V, 5 W, 017AA, 5 %, 2...
 Buy ON SEMICONDUCTOR 1N5388BG online at Newark element14. Buy your 1N5388BG from an authorized ON SEMICONDUCTOR ...  |   |

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    On Sunday, March 20, 2016 12:58 AM, Dennis Monticelli <dennis.monticelli at gmail.com> wrote:
 

 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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