Folks, Back to the list after a long layoff... I am helping a brilliant, motivated, YL ham in Uruguay, achieve her dream of going QRO at her existing HF station. She is a CW/DX/Contest Specialist. I
Folks, Looking to buy a Heath SB 220, in any condition, including (even preferred) incomplete basket cases Or a fully working example. or any other of the 2 x 3-500Z amps, commercial or homebrew. Nam
Folks: I have a very old but healthy Drake L4B with the gray solid carbon plates, with flutes oriented horizontally. I also have used, more often, the 3-500Z amps with the tantalum plates, with verti
RE GS 35 B Possible choice for Homebrew Amp: Thanks Bill for your comment on the GS-35B The efficiency may become important, if it means that you cannot get 1.5KW out of the GS 35B with 100 watts dri
Since I am designing from scratch, will the GS 35B, like the 3-500Z, produce more power and efficiency at a higher than ham amp-typical B+? Say 4KV? Best Regards, 73, de Pat Barthelow AA6EG _________
Folks, Still scoping current sources for Amp Parts. Found a Chinese maker of the classic, bakelite sockets, that are particularly effiicient at getting free flow air around the tube pins. I also reme
Thanks Steve for that information. I actually have quite a few of those those Ceramic Sockets in EF Johnson. I was fortunate enough to get a substantial collection of various QRO parts directly from
Years ago I saw some vacuum packaged 4CX 250B tubes, at a military base MARS station. The 250Bs, were in OD green cans about half the size of a can of chili and had molded plastic suspension inserts
Actually yes... No Joke... I understand the difference between a hard vacuum, like a 3-500Z has and a "soft" vacuum. I am just thinking that what may be useful, is to reduce the differential pressure
Also, and I obviously have not been around labs that deal in vacuum physics, or processes, but I remember seeing a tube of "Vacuum Grease" somewhere that apparently is used to seal glassware valves,
Folks: While looking for cabinet solutions for a new build amp, I came across an industrial computer rackmount cabinet in storage. Looking further, I Googled Rackmount servers, Images and found a lot
Folks, I subscribe on line to the Microwave journal. The just announced that On May 11th, 2010 - 11:00 am EDT They are offering a webinar on HF impedance matching, working off the following outline:
Folks: I plan to send some used 3-500Z tubes to a ham in Uruguay. This ham found out the hard way, when someone else mailed her a Laptop, on which she paid substantial duty. How does one minimize or
If you can find someone's digital files copies of HAM RADIO MAGAZINE, they did a feature article about the 5 CX-1500A sometime I think in the Mid 80s. Best Regards, 73, de Pat Barthelow AA6EG Arecibo
Folks, In the course of helping a YL build an amp in Uruguay, I am making progress, but am amazed at the challeges faced by hams there, and probably other small countries, who want to buy or build ha
Wow, Thanks all for your helpful contributions. What a brain trust we have here on the reflector. So, if anyone in SA has an Amp, homebrew or otherwise that they want to fix, or even donate, or sell
I found this interesting article: http://www.unc.edu/depts/diplomat/item/2009/0709/fsl/fsl_diplodx.html Looks like I should check with this Foreign Service officer/ham, who may have some solutions, f
Thanks Paul, For your comments. I wonder what is involved in revbuilding/rewinding a high voltage/high power transformer, say similar to what you find in a SB 220. And how much/what kind of damage ha
Folks, As most of you have read, I am seeking an amp for a friend in Uruguay, via almost any mechanism that is minimal cost. Basket cases, tubes, parts, whatever. Come to the conclusion that most has
I was inquiring about QRO transformers in Uruguay, a short while back, and someone on the reflector, sent me this very interesting URL about transformers, that may be of interest... http://ludens.cl/