Re: [TCML] GU5B VTTC rebuilt- new CW PSU

[Liviu Vasiliu <teslina@xxxxxxxxx>]

Hi

The new source is ready.
I was lucky enough to get these nice HV diodes (75 kV @ 100 mA):

http://img143.imageshack.us/i/teslahvdiodes.jpg/

The new PSU is a Greinacher cascade. The voltage from the 4 MOTs is doubled. The cascade capacitors and the filter caps reduce ripple. I used ferite beads as RF suppressors on the output HV cables:

http://img243.imageshack.us/i/greincwgu.jpg/

The pics of the PSU:

http://img706.imageshack.us/i/cwgupsu1.jpg/

http://img220.imageshack.us/i/cwgupsu2.jpg/

http://img209.imageshack.us/i/cwgupsu3.jpg/

http://img257.imageshack.us/i/cwgupsu4.jpg/

Some big and hot rewarding discharges:

http://www.youtube.com/profile?user=teslina#p/u/0/RXIIAme_dAk

After playing with the new toy my little variac was toasted:

http://img526.imageshack.us/i/cwguvariac.jpg/

...but I will find another one.

Enjoy

teslina
>
>



--- On Sat, 10/16/10, Liviu Vasiliu <teslina@xxxxxxxxx> wrote:

> From: Liviu Vasiliu <teslina@xxxxxxxxx>
> Subject: [TCML] GU5B VTTC rebuilt
> To: tesla@xxxxxxxxxx
> Date: Saturday, October 16, 2010, 1:32 AM
> Hi
> 
> I made a few grid network modifications preparing the setup
> for full CW (I collecting parts for a new power source). I
> am runing now with a 0.56 Kohm high power grid resistor
> (made with different size high watage resistor). The tube
> runs cool (it is safe to put the hand on the anode 1 minute
> after fillament shutdown, with the coolers on)
> 
> Grid resistors
> 
> [URL=http://img145.imageshack.us/i/gu55rgrid.jpg/][IMG]http://img145.imageshack.us/img145/3589/gu55rgrid.th.jpg[/IMG][/URL]
> 
> Whole system ready to fire:
> 
> [URL=http://img233.imageshack.us/i/gu55sys.jpg/][IMG]http://img233.imageshack.us/img233/6961/gu55sys.th.jpg[/IMG][/URL]
> 
> Over 80 cm hot long streamers
> 
> [URL=http://img26.imageshack.us/i/gu55sp1.jpg/][IMG]http://img26.imageshack.us/img26/9445/gu55sp1.th.jpg[/IMG][/URL]
> 
> A movie on youtube:
> 
> http://www.youtube.com/user/teslina#p/a/u/0/H_hNd1exC60
> 
> I hope to finish the new source maibe in a week (just
> currious how it behaves in CW).
> 
> 
> teslina
> >
> >
> 
> 
> 
> 
> 
>       
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> 



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