Author: gudguyham--- via Amps <amps@contesting.com>
Date: Thu, 25 Aug 2022 01:15:05 +0000 (UTC)
Tom W8JI took over Command Tech. He may have a plate choke. Doesnt hurt to email him and see. Hes looking for an L2 toroid for me. Says he does have some parts. Sent from the all new AOL app for i
Jim, Thanks for sharing the 160M toroid details and the pics. I have a PA-70V and I am about to add 160M to my amp. RF concepts was not able to provide any guideance here but I was able to find a cop
Never had one blow here Jeff, I get them after the smoke is gone! Sometimes the damage is extensive. Both transformers, filter caps, diodes, meter, and a tube or two. Customers dont like hearing that
Carl, That SB220 stock transformer is really a marginal design. The SB200 is a far sturdy bird albeit at a lower voltage - even when compared under the same current draw. And wow, when the winding sh
Id be concerned about the plate transformer temperature rise as its only rated at .6 kva in CCS service. Also filter cap temperatures. In the RF deck the problem could be RF heating in the input or o
Bill, Assuming the grid current is within specs realtive to the grid disipation limit (which I believe it should be as the 500z need a strong drive), the question is one of plate disipation limits. 2
I suppose right up there with RTTY is WSJT with its mode-defined 50% transmit cycles (30 seconds "on" for FSK441/JT6M, 60 seconds "on" for JT65). I'm running a 6-meter-converted SB-220 with new match
Kevin, You are right. RTTY is the big boy challenge for amps. But it tends to make things fall apart in amps in the strangest ways... You had asked some questions about determining temps. I had not s
The grid V requirement is such that the grid-terminating R can be 50-ohms -- with the grid driven directly. What is the design Q of your tank? 5cx1500s are fairly rugged because the thoriated-tungst
SNIP Start on 10 and work down since any change to the 10M L has affects on decending bands. Dont worry about 80 for now, I've never had problems down there with the 850 as-is. Trimmers vary roughly
Burnisher with Black Plastic Insulated Handle, For Fine Contacts, 3" Length x 3/16" Width x 0.007" Thickness (3 count) https://www.amazon.com/Jonard-OB-1-Burnisher-Insulated-Thickness/dp/B006C47JOI/r
Ham diode 10kv 15kv qsl advertiser 2000 Send Amps mailing list submissions to amps@contesting.com To subscribe or unsubscribe via the World Wide Web, visit https://na01.safelinks.protection.outlook.c
ORIGINAL MESSAGE: REPLY: If you have a single coil with taps for each band, the shorting type of switch will reduce or prevent the Tesla coil effect by shorting out unused sections of the coil. If yo
Tube 8877 3750 v drop back to 3450v 6 mills current at 65 watts I seem to be getting about 1200 watts out on a two tone oscillator I have a Ferrite toroidtank circuit . 10/15 meters are on a reg cop
I presume you mean the modified B&W 852! ** Its an 850A that Ive rebuilt and slightly modified the L values. The 4X1 is a Hi Z tube That's what I'm planning to use for my 4CX1000A amplifier. I simply
Offering the following items for the amplifier builder: A. 10-160m tankcoil and switch assembly from a Heath SB1000.Complete w/toroid. Fully wired $45 B. Near mint Dentron MLA 2500 10-160m 2KW tank
Here's the deal, I'm 'converting' a 2KW 13.56mHz plasma generator for = 160 thru 10. The basics: 5CX1500A, 3.8KV EP. Got it running 'stock' (class C) = before conversion, easy 2KW output. =20 Convers
Author: gudguyham--- via Amps <amps@contesting.com>
Date: Thu, 25 Aug 2022 01:23:44 +0000 (UTC)
Steve, can you take a digital of the entire RF deck area of that amp and post it or send it direct to me? I dont think I ever saw that particular configuration. Would that possibly be the later Pal
It's a Command Technologies, HF-2500M. The way they have the 3CPX800's mounted, there isn't room for the RFParts choke without some modifications 73, Steve, N2IC _____________________________________
Author: gudguyham--- via Amps <amps@contesting.com>
Date: Thu, 25 Aug 2022 01:04:01 +0000 (UTC)
Wow, Ive seen my share of these amps but never saw that happen to a plate choke. Im just thinking. I think I wrongly assumed tnis was a Command Tech 2500 but apparently is a QRO Tech 2500. Guys, p