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### never had any problems on my L4B's.... use chimneys'. How fellow's melt the solder on the pins of 3-500Z's on a SB-220 is beyond me... since the SB-220 fan blows air on the pins. ### The slightest

As I understand it, the last reason is correct. In the first and last article I wrote for QEX, the ARRL's copy-editor added 5 technical errors to my manuscript. R L Measures, AG6K, 805.386.3734

The driving signal is applied between the cathode and the screen instead of between the cathode and the grid, and the control grid is connected to the cathode. Thus, the gain is c. the same as the

current??. With only that tube it ### good question. I was told that the Eimac SK-410 will easily handle 26 A. Ditto with a SK-510 [4-1000 socket. Some versions of the 4-1000 ran 7.5 v @ 26 A] ###

wrote: ### What is a ...."magnetic regulator" ? ### How fast is fast ?? As fast as practical ?? My idea of using a sola ferroresonant xfmr... was now I don't have to ever worry about my fluctating

060920@...> wrote: technical articles in QEX instead of QST?) but I don't see huge rheostats for filaments either. ### I wonder the same thng.... probably to promote sales of .."QEX". They have one

a cheap and reliable methode is the magnetic regulator, I use choke regulated heater transformers. There is no need for fast regulation. 73 Peter ________________________________ From:

060920@...> wrote: seems building technical

Tony Wrote I think that is fairly obvious. Most hams today wouldn't understand them and don't care, and the ARRL can make more money selling another magazine. David KC2JD

pentalab escribi:

pentalab wrote: I'd be interested in the article (wonder why ARRL puts good technical articles in QEX instead of QST?) but I don't see huge rheostats for filaments either.

OK... I'll bite. What exactly is Orr's... "super cathode driven" circuit all about ?? Is this simply semi floating the grids on a 3-500Z.... or something else ? 25 years ago.... there was this circuit

A CV transformer is uneffected by RF. An active regulator will have to be properly shielded so RF doesn't modulate it. I saw it as a cool idea but the failure modes could be a problem. gfz pentalab

wrote: Filament any size tube is accomodated by increasing pass transistor sizes, feature. My guestimate suggests that it would be cheaper building this regulator than buying 2 X 50 or 100 watt

My last VHF Contest was a few miles East of Mt. Pi?os on Frasier Mountain. What is your callsign? R L Measures, AG6K, 805.386.3734 r@..., , rlm@..., www.somis.org

Reid Brandon at Eimac phoned me today. Reid passed this important info along. The correct phone number for Arnold Howell [KB8JCY] of Howell Tube Sales is 330-744-7582. Make sure to *82 1st... to shut

Just looking around. Hi to Rich! Longtime no hear! Remember that excursion to Mt Pinos for the VHF contest in the 70's? 73/Rick

I often order HV transformer from a local shop. price: RMB2 per VA(25C/VA), a 1000VA CCS HV xfmer =$253(TYPE R or C iron core), if it is "EI" type iron core, the price is $150. 73! Hsu

Try this again since it claimed to post it then didn't. That transformer looks somewhat familiar. There's a company just outside of LA named WTS which is short for Woodys Transformer Service that

That transformers construction looks familiar. Several of us used a transformer manufacturer just outside of LA which was called Woodys transformer at the time. They wound about all the transformers