06/09/2012 21:32 What is a readily available plain (unclad) board material to use to build an electrolytic capacitor array supporting a 5kV supply for a 3CX1000A7 tubed linear please? I am in the UK,
Ooops, typo there Carl, should be 3CX3000A7 (in a Henry 2000D RF generator). It's been brought to my attention that I should have cited an operating temp for the baord. I can only guess, the enclosu
20/09/2012 19:38 Henry (and others) often used an encapsulated HV diode module or block for the HV rectification. Three spade type terminals per block, two blocks used in single phase linear amp supp
24/09/2012 12:21 I am in the midst of making a couple of HV power supplies. I would like to know if there's a safe means of testing these under load, without using the RF deck and an expensive tube t
24/09/2012 20:53 Thanks Peter, I didn't have a suitable transformer, but have basically ascertained they all work, with no variation in voltage drop, so presumably all diodes are OK, using my variab
16/10/2012 11:11 But don't buy all the 1 inch ones, I want some more off them :) -- Best Regards, Chris Wilson. _______________________________________________ Amps mailing list Amps@contesting.com
03/11/2012 23:09 I have used these high voltage resistors for various applications with good success, fast delivery and good communications : http://www.ebay.co.uk/itm/180976136870?ssPageName=STRK:M
18/11/2012 19:54 What's the situation with regard to toroidal versus conventional transformers for HV plate supplies of circa 5kV and circa 1.5 Amp plus supplies these days? Are they a way forward, o
17/12/2012 17:34 Having built a big 5kV 1.8 amp supply that seems to work safely and well, I want to build a lesser one for a single GS35B 2 meter amp. I have a suitable transformer with a good range
19/12/2012 14:03 Thanks for the reply Rob. Is there a way to check the inductance of another choke I have? The other one is bigger, and is from a 3 phase supply for a Henry RF Generator. It gave jus
19/12/2012 22:38 Thanks for your 2 replies Carl, and to Bill Turner. I think I will abandon the idea of the resonant choke input filter and stay with the previously successful capacitive input filte
20/12/2012 19:05 I am an ARRL member (much better than the RSGB...), so have access to the database. I have printed off the article and done the maths for 50Hz mains. My only concern is whether to p
20/12/2012 21:27 Well, I checked it at 115V and at 200V and at 240V, with current drawsof 13.08mA, 23.3mA and 28.09mA respectively, giving according to the article, and inductance of about 27 to 28
04/01/2013 00:28 Jim, if the 3CX-3000A7 in my Henry RF generator I am converting turns out to be a duffer, or fails prematurely (I have had filament power and the blower on for a few hours, but not
23/01/2013 00:14 If they use the same marker as here in the UK cellulose thinners gets it off. I am a race car engineer and I use a lot of aluminium in sheet and other forms, that's what works on al
04/02/2013 19:41 Any neat way to get power in and out of those units Mike, if used as a bench top supply, rather than built into the amp itself? Can they be stacked to double the current? Cheers. --
27/03/2013 21:58 I think it's the 2011 ARRL Handbook that mentions LF oscillation in linears, and I recall it mention input to output coupling issues, I can type out the relevant paragraph if you th
09/04/2013 22:27 You might want to look at some of the race car sites for brake cooling ducting hose, for the pipe. As for converting the flanges you will probably find it best to get someone to TIG
14/04/2013 21:32 Any idea what sort of power one would give with 10 watts drive? I have downloaded the manual but it does not seem to give a gain figure. Thanks. -- Best Regards, Chris Wilson. _____
16/04/2013 16:34 May I ask a question re my construction of a tuned input circuit? I am converting a Henry 2000D RF Generator on 27.12 MHz to (initially) a single band (20 meter) linear amp. I am try