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Ah good. Somehow this important Topic got?"locked" last night. If a moderator did that please let me know. It's unlocked again. Here's the latest and more critical look at the Bias HV drop across

"I haven't done this latest conversion yet. and I guess there is nothing wrong with the zener kit - maybe I am lazy, it just took a while to bend and fit the zeners in and solder them up. Your

Roger, you could reduce the Penultimate (Ver. 1)? ?parts count, increase reliability and improve thermal stability by replacing the transistor cluster with a single CA3096 or one each CMTX 3904,

Good Michael C I'm glad I left that on the schematic. There was a reason to leave the choke in, can't remember exactly, maybe it worked better with the CDV-705 Speaker box. The original LENi used

I haven't done this latest conversion yet.? ?and I guess there is nothing wrong with the zener kit - maybe I am lazy, it just took a while to bend and fit the zeners in and solder them up.? Your

Sounds good Roger, my only suggestion is when it's breadboarded and nailed down, build a BOM using the best parts available, regardless of cost, to see what it can really do, to establish a baseline

Peter/Geo/Michael/All, Take a peek at the regulation curve enclosed..... Simulation is from 800V ramped to 1200V on the UnRegHV input and the RegHV output is a nominal 915V +/-2V over 1000V to 1200V

Sorry I don't remember P. , without getting out the manual. It's specific to the scope, has automatic 10X transfer (the scope recognizes the probe and switches automatically and a separate wire at

Great on the conversion Michael C! What was fiddly about the kit version of the stack? Did you get the two resistors the right way around? (glad to replace them with constructed/ tested one if need

geo what the rise time of your hv scope probe? p

" So I still think I do not understand everything I "know." rogerw" Neither do I Roger, by a long shot. For whatever reason I never looked at the tube pulse before, and it surprised me too.

Sounds great! btw, either of those small signal HV Mosfets that Michael found look good for this. I have no idea how it might matter to reliability operating so close to the breakdown voltage, at

very kewl! that strikes me as an extremely good price. I bought one over 2 years ago for 3x that amount IIRC...... rogerw

Roger et al: Spent a few minutes in my junk drawer. Found a 2SK3265( 700V part) I checked the break down of the body diode, no problem to 1150 V. Mod'd the cascode to just 1 Mosfet. Wow, regulation

I picked up a $25 ENI cdv700 on Ebay, I plan to convert it to a LENI.? What I learned from my last two ENI conversions - the LENI schematic shows 18k R18...? pretty sure in place of a wire wound

Well, hmmm...... 1) I yield to your point, and, 2) I often find I do not understand everything I "know." This appears to be another one of those times........ btw, I totally agree with your

Well the question was how to model the GM tube source signal in Spice......? All I meant by that was that the only signal seen by the detector is the transient pulse caused by a radiation event, and

On Sun, Apr 3, 2022 at 01:40 PM, Roger Whatley wrote: > > > > k, in that case you will see a rather fast 900V rise to the neon bulb, > except the neon bulb will begin conducting at something like

Roger: I got lost. I didn't understand the commented direct to me: s ince the 900+V bias is blocked by the coupling capacitor to the detector circuit, you don't have to worry about that.???? p

ok, in that case you will see a rather fast 900V rise to the neon bulb, except the neon bulb will begin conducting at something like 100V(?) and if there is no current limit on the HV supply, will