R. Measures wrote: Rich, how about submitting the results as a paper to a peer-reviewed scientific journal? Why bother? I saw it, but others saw it long before I did. 0.5 S-unit / 3db is no big deal.
Hi, http://www.g8wrb.org, which has a lot of tube data sheets has had a major change to it. Parts of the site are now on another server, which has much greater speed and capacity I'd appreciate any n
Steven Cook wrote: Team, I have seen this many times myself -- however, I don't care nearly enough to try and convenience anyone. If this phenomena is merely the result of S-meter calibration/respons
Here's a list of the files added to http://www.g8wrb.org/ in the last 41 days (this year). Most are FULL tube data sheets - with one or two exceptions, these are not single page summaries you can dow
I came across a load of transformers the other day being scraped. I could have salvaged them, but decided against it. All had secondary voltages between about 75kV and 200kV, but with primaries of 16
kenw2dtc wrote: David, I would put this response on contesting.com but I would be eaten alive by the guru's. I'm taking a stab in the dark as a rank novice on the subject of power: If the x-ray facil
A search of the web shows many people are writing mails, web pages about non-existent tubes. Apart from being a bit sloppy, it does create problems when people try to search for material on the web.
Norman Hockler wrote: Charlie, I do not know the history of the YC-130 but the YC-156 ( 3CPX5000A7) is as rugged a tube as you can find. This tube ( a high mu triode) was designed by Eimac for the me
k7fm wrote: David said: "I feel we should all try to use the right part number, and not not refer to a 3CX1500 if we mean an 8877 / 3CX15000A7." Then, in the next sentence, says: "I do feel we could
Steve Thompson wrote: Bill L. Fuqua wrote: While you are at it. 20 meters is not 14 mhz. that should be MHz or even 20 metres :-) As for commas and suffix letters in part numbers, I have other things
Whilst the 4CX350A and 4CX350F differ only by heater voltage (and so one would assume have the same linearity), the 4CX350FJ is different, in that it is designed for low intermodulation distorsion -
I've not checked the data sheets, but if Eimac put linearity figures under two different conditions, it makes it hard to compare how much better the FJ is than the F. I'm not sure whether or not you
Hi, I have changed the server on which www.g8wrb.org is hosted. Once this is done, it can take a couple of days for everyone to see the new server - the 'nameservers' you use will not all get updated
Well if the anode voltage is higher, you will expect that, even if you had the best stabilised heater supply in the world. I doubt it the filament voltage, but the plate voltage that is changing your
Could he not use a commonly available 10-turn pot, to give 0-3k resistance? Just use 30% of its full travel. -- Dr. David Kirkby, G8WRB Please check out http://www.g8wrb.org/ of if you live in Essex
Someone posted a link of an amusing eBay auction a little over a year ago. This was a really poorly constructed amplifier. I've converted it to a pdf. http://www.g8wrb.org/useful-stuff/ebay-auctions/
Densis, I hope you don't mind me putting my reply to your private email on the mailing list, but there is nothing confidential in it and your mail server is blocking my IP address. I had this happen
I know I have asked this before (over 4 years ago), but does anyone have any data on either of the above tubes? They are conduction cooled tetrodes, similar(ish) to the 4CX250B. I have several, and h
I built a twin 4CX250B amp for 2m. As a test one day I decided to apply RF power to the the grids before the heaters were on. Then I switched the amp on (i.e. HT, followed by grid, heaters and screen
In the original design (you were right, it was the W1SL), the cross-over wires had pieces of metal on the ends. I can't the recall size, but they were about 6mm square. (I'm going back nearly 25 year