Hi Bill, That transformer is designed to be operated with the secondary center tap grounded. It is not insulated for full wave bridge connection. And it's only good for about 1KW. Hardly enough to wa
Hi Bill, I have several UTC catalogs from 1956 through 1964 and they all list the S-50 as having a center tapped secondary. I used to have a couple of parts from that family myself back in the 2nd mi
Here are some real numbers for simulation: A 3KW Varian plate transformer (85 lbs) 240V Primary -- 2.2 ohms DCR, 40 mHy inductance 3200V 1A Secondary -- 22 ohms DCR, 9H inductance A Westinghouse 1A,
Hi Dan, Upgrade to a Tek 577... or... use a floating bias supply for the offset, perchance a Lithium battery connected to a small pot bypassed with a suitable capactior, in series with the gate lead.
Hi Ed, Please see: http://wc6w.50webs.com/wc6wtest/index.html?fr50.html 73 & Good morning, Marv WC6W http://wc6w.50webs.com/ __________________________________________________________________________
Hi John, There is a very simple unit in the May 1987 QST pp 23-25. 73 & Good afternoon, Marv WC6W http://wc6w.50webs.com/ _____________________________________________________________________________
Hi Bill, http://wc6w.50webs.com/wc6waccy/index.html?fr60.html 73 & Good morning, Marv WC6W ____________________________________________________________________________________ Take the Internet to Go
Hi Glenn, If you reallllly want to go for small & light you might research using a Microwave Oven Switching supply, with some additional C on the output, for the plates. Someone on this list was inve
Hi Alex, We had a brief discussion here last year on this topic. See this link for some technical info on the Panasonic microwave oven SPS. http://users.bigpond.net.au/dwsmith/hv_inverter.pdf _______
Hi Colin, There is an article in "CQ", April 1970, pp16-21+85 detailing an all band (the bands there were back when) super cathode design using a 4CX1000A. 73 & Good evening, Marv WC6W http://wc6w.50
Hi Carl, Check the 8904/4CX350FJ. It has superb IMD specs and will fit the socket. A retrofit will be required for the heater supply. 73 & Good evening, Marv WC6W http://wc6w.50webs.com/ ____________
Hi Fern, I have one airflow switch left for sale. See description on my webpage at the bottom of: http://wc6w.50webs.com/wc6wfsw/index.html?fr43.html 73 & Good morning, Marv WC6W ____________________
Hi Fern, You don't want the system to transit resonance when the current increases in the choke or bad things may occur... Setting the resonance slightly to the high side at low current is correct so
QST The topic of screen regulators comes up here annually so, I finally got around to uploading a cicruit to my webpage which I designed and used, in various incarnations over the last 20 years, and
Hi Carl, I've got one new one and a pair of used ones left. See: http://wc6w.50webs.com/wc6wfsw/index.html?fr41.html 73 & Good morning, Marv WC6W _____________________________________________________
In order to meet the price, weight and broadband requirements discussed herein the past few days, I offer the following approach: Start with the 1500 watt peak output amplifier described in the old A
Combined replies to comments: you are going to use dissipate 150 watts in the heatsink vs 600? Hi Todd, Wellllll, to my limited understanding, Class E provides poor utilization of (expensive!) FET Dr
Hi Paul, The amp section is 25 cents/watt per APT -- $250 The power supply will run about $100 in parts. The Pi-nets might run a couple hundred in today's depreciated dollars. The cabinet, heatsink(s
Hi Larry, AFAIK, all of the "60" series Dow-Key's were/are rated at 1KW RF. The trailing numbers just define the options: connectors, external contacts, etc. 73 & Good morning, Marv WC6W http://wc6w.
In response to private discussions, I've upgraded my Bird 43 PEP adapter circuit to be accurate with modulation frequencies up to 5KHz and added a delayed release function so that a single dit, or ot