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wrote: ### Dunno. You would only have 5% ripple with NO cap.... and with a resonant choke set up.....you probably wouldn't need any C at all ! [3 phase] ### Seems to me.... WAY back on 'amps'....

Yes, that is the distinct number of people w

wrote: the of group group it ### DREAM ON. I checked 'amps' on contesting .com 3 times now.... with a microscope [pulling up their archives]..... it ONLY got posted TWICE..... once from Mike... once

Your understanding is incorrect. There were several announcements of this group, as well as the larger more-established rfamplifiers group on Yahoo that made it to AMPs. Everytime someone posted on

High value wire-wound resistors have a well deserved reputation for opening up - even when operated well within the mfg's max-V rating. cheers, Denny R L Measures, AG6K, 805.386.3734 r@..., ,

Rich I took a look... The resistors are L100J-20K rated 2850 volts max.. It is a string of five in series, so I see no problem... Perhaps you were thinking of a different resistor, but thanks for the

Hi Group, Anyone have the schematic and hookup info for the Alpha 99 HV transformer that you could send electronically? I have downloaded the manual from Alpha but it does NOT include any schematic or

Ummm, no... Thought didn't occur... I will do that but I unlikely I will make a change... One resistor got hot in the middle of the winding, bubbled the coating over a distance of about an inch and a

As I understand it, announcements of this group's existence on the AMPS group were somewhat censored. R L Measures, AG6K, 805.386.3734 r@..., , rlm@..., www.somis.org

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