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Registered Member #99
Joined: Thu Feb 09 2006, 06:10PM
Location: florida, usa
Posts: 637
Hello all, I was wondering if anyone here has pushed a TV tripler beyond 30kV. I am not sure what they are able to run at, but before killing the one I have, I wondered if someone had already done this.
Any thoughts? They are supposed to be 6 stages, so I dont understand why they are called triplers instead of 6 stagers or whatnot. Thanks, Matt
Registered Member #1225
Joined: Sat Jan 12 2008, 01:24AM
Location: Beaumont, Texas, USA
Posts: 2253
Well apparently the triplers are used with LOPTs that are 8kv, to give around 30kv. That would be tripling. But i have never heard that it was 6 stages. If it is 6 stages, i would guess they just meant each multiplication stage used two capacitors, for a fullwave multiplier. But i do not think they are fullwave multipliers. I am not so sure...
Registered Member #99
Joined: Thu Feb 09 2006, 06:10PM
Location: florida, usa
Posts: 637
Yea, the output wire says 30kV on it, so it wasnt intended to put out more than 30kV. But, I wonder what I could expect to push it to. They are $15.00 on ebay and are either described as being 5 stage or 6 stage (most the auctions say 6 stage). I also assumed they meant 3 stages using 6 capacitors. Maybe I will push one to its death to find out. Matt
Registered Member #33
Joined: Sat Feb 04 2006, 01:31PM
Location: Norway
Posts: 971
There is a simpler way of cascading multipliers that I came up with some time ago. Schematic is attached. I modified Jochens schematic from , I hope he doesn't mind.
The advantage of doing it this way is that you don't need to drill holes in the cascade or figure out where to drill the holes. The disadvantage is that the capacitors have to stand 30kV instead of 10kV. They only need to be 1/3 of the capacitance of the capacitors used in the cascades though, and as an added bonus the output of the cascade is stiffer, sagging less under load. Suitable caps can be had for a few bucks on eBay, and the cost of a ruined cascade due to drilling wrong will easily pay for the capacitors, not to mention the time spent figuring out where to drill and drilling the cascades.
Registered Member #543
Joined: Tue Feb 20 2007, 04:26PM
Location: UK
Posts: 4992
I would expect the unloaded voltage of an LOPT tripler for colour television service to be of the order of 36kV - the unregulated voltage anticipated by the designers of the 6BK4B (PD500 in Europe) shunt stabilizer triode - from which the 25kV regulated supply for the picture tube was derived.
I think perhaps your seller is confusing the number of diodes or capacitors with the number of stages. I have never seen or heard of pentuplers of hextuplers in televsion service.
One interesting variation that is occasionally seen in TV EHT doublers is one that appears to have no capacitors at all - but is actually using stray capacitance, and the capacitance of the mu metal screen on the tube for this purpose.
Registered Member #99
Joined: Thu Feb 09 2006, 06:10PM
Location: florida, usa
Posts: 637
Anders M. wrote ...
There is a simpler way of cascading multipliers that I came up with some time ago. Schematic is attached. I modified Jochens schematic from , I hope he doesn't mind.
The advantage of doing it this way is that you don't need to drill holes in the cascade or figure out where to drill the holes. The disadvantage is that the capacitors have to stand 30kV instead of 10kV. They only need to be 1/3 of the capacitance of the capacitors used in the cascades though, and as an added bonus the output of the cascade is stiffer, sagging less under load. Suitable caps can be had for a few bucks on eBay, and the cost of a ruined cascade due to drilling wrong will easily pay for the capacitors, not to mention the time spent figuring out where to drill and drilling the cascades.
Anders M.
Hello, Thanks big time! That is very helpful! I plan to just use two triplers since I dont want to over volt the x-ray tube. Should I just omit the second capacitor then? Another things I notice is that one connection is to be left open. It appears as if D1 is not connected, but I beleive is connected in the module. Do you mean to somehow disconnect this diode? Matt
Registered Member #99
Joined: Thu Feb 09 2006, 06:10PM
Location: florida, usa
Posts: 637
Anders M. wrote ...
Yes, just omit the leftmost tripler and capacitor if you only want two stages.
Regarding the diode, it is usually connected to a seperate pin on the tripler. It is explained in more detail here
Anders M.
Hmmm, I may have the wrong type triplers for this. I see only 4 wires on mine...Out,FO (focus maybe?), REF (ground ?), and IN. I have been connecting the In to the flyback xfmr output, the REF to the flyback return wire (and grounding this) and using the OUT for the HVDC+. FO was clipped off.
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Pushing a TV tripler
