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Re: [TCML] Some VTTC tube rolling results...got surprised twice!

Great results!  Beats my tube coils.   Need to try once again.  Cheers,


On Tue, Dec 25, 2018 at 9:18 AM Chris Reeland <chrisreeland@xxxxxxxxx>

> Thanks BrianB,
> I still feel myself, it is still a bit ugly :-( but works great :-)
> That would be great if you do a VTTC. Kind of lonely here currently in this
> realm... :-D
> They are my favorite. I also just love the glow of a glass vacuum tube. And
> "seeing" the friction of the electrons "hitting" the plate. And speaking of
> "seeing", these 304's are unlike any tube that I have ever run before when
> it comes to this...there are some really neat "patterns" that can be
> seen...
> Now my next one waiting for Spring does look nice and I hope it stays that
> way...
> Back to the working great part... I have gotten around to rolling all my
> 304 tubes on this improved setup yesterday (12/24). Ran each tube for just
> a "quick" tuning for best streamer length, wrote down results, and then I
> just "played" around with each tube trying different rates and changing
> tuning settings. Spent from 3pm to 8:30pm rolling. Downtime switching tubes
> was about 5 minutes each. Otherwise running non-stop. MOT handled this just
> fine, only getting slightly hot at times, but cooled quickly on lower rates
> and during tube switching. No more the scalding hot just touching it for a
> split second checking it!!! The last time I did tube rolling on several
> tubes, I had to let the MOT really cool down after each short run. Took
> really long, for not really much true run time.
> So here I will just list the results now:
> Again this is just 10A variac using the 120V setting. And no PF caps, not
> going to bother.
> Eimac 304's
> TL#1 got 31"@14.5A
> This one is still the "swords" tube, easily tuned in for this.  And I can
> now also tune for some other strange behavior. Still the only tube that I
> can get perfect swords just one after another. Going to scope several
> things on this tube when I get a chance, take pictures and notes and then
> scope a "regular" tube and compare. I will admit I am still puzzled by this
> one tube. Only one like it.
> TL#2 got 32"@12A
> TL#3 got 34"@14A
> TL#4 got 33"@14A
> TL#5 got 34"@12.5A
> TL#6 got 33"@12A
> TL#7 got 31"@12A
> TL#8 got 34"@13A
> T?#1 got 33"@14A
> The reason for the question mark is the tube markings are completely gone,
> not sure if a TL or TH.
> TH#1 got 33"@13.5A
> TH#2 got 33"@11.5A
> TH#3 got 32"@13A
> TH#4 got 33"@12.5A
> Very pleased with these results and the efficiency here. Going to pick a
> couple and do some really thorough experimenting and tuning when I get a
> chance.
> So this is all for now... Happy Holidays everyone...
> Chris Reeland
> Ladd Illinois USA
> Sent from my LG V20
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