Re: [TCML] VTTC Power Supply with 866A

[Tesla <tesla@xxxxxxxxxxxxxxx>]

Hi

Others will no doubt suggest a string of 1N5403's or the like (not as 
pretty) however I'd suggest you persevere with MOT's for both the swinging 
choke and main Xfrmr (cheap and available) and make some suggestions.

I am not clear what DC supply voltage you are seeking but from your post I 
assume about 2800 v DC with a choke input L/C filter and want only 2 
rectifiers hence using a centre tapped xfrmr  to get Full Wave rectification

1) With MOT's  as main xfrmrs and MV rectifiers only used (thus choke I/P 
filter required) 2800 v is a little tricky, you could play around with 2 
MOT's per side and reduce the primary voltage in some manner.

2) An array of MOT's as a swinging choke, I's suggest a small gap in the 
E/I's say around 0.15 mm (this can be adjusted to set onset of saturation 
and hence the swinging point) An array of 3 in series with the right gapping 
should be about right but you may need to experiment. There will be a 
configuration of MOT's in series and or // that will do the job.

Some while ago I injected a variable DC current  thru a MOT secondary while 
simultaneously measuring the AC secondary impedance (Hence L) and MOT's 
saturate with DC in the secondary very quickly unless gapped. These 
measurements assured me  the array I built for a ring up choke in a DC 
resonant design  would maintain it's L in the presence of DC currents. Can 
offer more advice off list if you need

Best
Ted in NZ

--------------------------------------------------------------------------------
From: E.m.c.2
Sent: Monday, October 24, 2011 12:51 AM
To: Tesla Coil Mailing List
Subject: [TCML] VTTC Power Supply with 866A

Hello to the whole list,


I'm 'making a power supply for my VTTC, which uses mercury vapor rectifiers 
more' precisely the famous 866A.


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