Re: LF: teflon capacitors

[gw8glo@aol.co.uk]

OK Andy they are the normal doorknob types, the ones I am looking at are made of a white ceramic case and are nitrogen filled with bolts at either end. There are 2 types available in 2000pf 2kv and 16kv. They are about 100mm long. They are available via ebay.
73 Dave

-----Original Message-----
From: F6CNI - Andy - JN19QB <f6cni@orange.fr>
To: rsgb_lf_group <rsgb_lf_group@blacksheep.org>
Sent: Thu, 11 Aug 2016 11:06
Subject: LF: teflon capacitors

Hello Dave, for info :

 

I did not tried the teflon models, but in the years 2002 I had an home made ampli on 2200m band, with 2 x 3-500Z tubes, also 800 W output.

 

I used Russian doorknob capacitors types K15U-2 and KVI-3 without any problem. They are still avaible on the UR4LL surplus parts site http://www.ur4ll.net/

 

Andy.

 

From: gw8glo@aol.co.uk

Sent: Thursday, August 11, 2016 9:39 AM

To: rsgb_lf_group@blacksheep.org

Subject: LF: teflon capacitors

 

Has anybody tried using the Russian teflon doorknob capacitors for tuned circuits on 137 khz? I have seen some rated at 2000pf at 16kv which will give me the 8000pf I require to tune the loop. So far most caps get hot or self destruct when getting to 1kw, only 2/3 power. Current at 800 w is about 20 amps. Thanks Dave