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2uF in a FWB is enough for a 4-1000A at 6kV.

That's what I presumed too until a friend did some tests with a Dahl resonant choke filter. He discovered that significantly less bleeder current than Henry Radio used would keep the standby potential

To see how much ripple was noticeable on the air, a friend put a 4-1000A on the air with a 6kV FWB PS running a 2uF C-filter. I could not hear any ripple -- at least on SSB. AM would likely have been

Welcome to the uncensored amplifier discussion group, Hsu. R L Measures, AG6K, 805.386.3734 r@..., , rlm@..., www.somis.org

Bob -- Grid current eventually gets back to the negative HV. It flows through the 33-ohms, to gnd, and from gnd through the grid-I meter shunt-R to HV-neg. Typical values for the shunt-R are c.

You can look here: http://www.xs4all.nl/~pa0fri/Lineairs/SB200/sb200eng.htm 73 Jim SM2EKM --------------------------------------------------------- Bob Green wrote:

Then, if we talk 3-phase supply and 6-puls rectifying, lets say around 5 kV DC potential, how much glitch C is needed to achieve 1.5 percent ripple? Forgot how to calculate it, must dig out books to

Jim, Yes, your correct on the 3-5% ripple for the plate tranny. I was thinking of the low voltage DC supplies when I wrote that. Sorry, my faux pas. The formulas are written around 5% actually since

ham_amplifiers. ### Yes HSU. We were wondering why it took you so long to find us !! LOL ### You can talk about 811-A's all you want here. And nobody is going to suggest boycotting Chinese made

Jim, that the transformer can be smaller than one for a capacitor input by a good bit. Most transformer manufacturers give for a choke input, the rms current is 1.2 x DC current, and for a cap input

Hi, I have join the list.Thanks for many friends Invitate me to ham_amplifiers. Hsu

All, At one time, I had the address and phone number for a supplier around Dayton or Cinci Ohio for transformer related supplies. They carried paper, varnish, wire, hardware, and lams. EIS I know

For higher power I use 3/8" on 160m, 1/2" on 80+40m, followed by ~3/4" on the higher bands. I do my silver plating with a homebrew mixture. When I had no other stuff on hand, I once used sugar to fill

See below, wrote:

OK, I've got the grids of the 572's grounded through 33 ohm resisters in parallel with 940pf of capacitance. No smoke!!! Plates are NOT glowing!! I'm getting a reading of approx 80-90 ma of plate

wrote: ### LOL ! I typ use 1/4" 3/8" and 1/2" [6-9-12 mm od] ### chek out what Multronics wants for say 1/2" tubing coil stock... like a 14 uh coil.... you will gag.. and have sticker shock. $8,000

wrote: glitch resistors and magnetic breakers in the primaries of the transformers is all I need ### You gotta be kidding us right ?? 2 uf or NONE !! ### here in NA... although 3 phase power [typ 12.5

wrote: ### I looked at the 8k/3 k ultra manual I have [same manual does both amps]. On the 8k they use 5 x 20k-100w resistors. Diss is a whopping 300 W CCS..... presumably so the resonant choke filter

Copper tubing is quite expensive overhere now. 10mm diameter is 3,60 Euro/m, 18mm is 6,40 Euro/m. Prices are for small quantities of course. 73 Peter ________________________________ From:

Zzzz Denny == Have you checked the max V rating of Ohmite's 100W resistors? R L Measures, AG6K, 805.386.3734 r@..., , rlm@..., www.somis.org