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Re: 3-500Z socket.... max current ratings
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] ###
By pentalab <jim.thomson@...> · #972 ·
Re: Filament Voltage regulator
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
By pentalab <jim.thomson@...> · #970 ·
Re: Filament Voltage regulator
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
By pentalab <jim.thomson@...> · #971 ·
Re: Filament Voltage regulator
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:
By Peter Voelpel <df3kv@...> · #969 ·
Re: Filament Voltage regulator
060920@...> wrote: seems building technical
By hinrgdj1 <hinrgdj@...> · #968 ·
Re: Filament Voltage regulator
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
By David C. Hallam <dhallam@...> · #967 ·
Re: Correct ph number + e-mail for Howell Tube Sales + Important Info !
pentalab escribi:
By GGLL <nagato@...> · #966 ·
Re: Filament Voltage regulator
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.
By Tony King - W4ZT <w4zt-060920@...> · #965 ·
Orr's... "super cathode driven"... what is it ?
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
By pentalab <jim.thomson@...> · #964 ·
Re: Filament Voltage regulator
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
By FRANCIS CARCIA <carcia@...> · #963 ·
Re: Filament Voltage regulator
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
By pentalab <jim.thomson@...> · #962 ·
Re: Howdy all!
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
By R L Measures · #961 ·
Correct ph number + e-mail for Howell Tube Sales + Important Info !
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
By pentalab <jim.thomson@...> · #960 ·
Howdy all!
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
By Rick xxxx <af67pmr7160@...> · #959 ·
Re: Here's the ultimate heavy duty plate xfmr !!! Pwrsource.com
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
By Hsu <Jbenson@...> · #958 ·
Re: Here's the ultimate heavy duty plate xfmr !!! Pwrsource.com
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
By craxd <craxd@...> · #957 ·
Re: Here's the ultimate heavy duty plate xfmr !!! Pwrsource.com
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
By craxd <craxd@...> · #955 ·
Re: Here's the ultimate heavy duty plate xfmr !!! Pwrsource.com
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
By craxd <craxd@...> · #956 ·
Re: QBL 5/3500 with G2DAF ?
By R L Measures · #954 ·
Re: QBL 5/3500 with G2DAF ?
cleaner with a 2-tone modulation test than it is with voice modulation. With voice modulation, total IMD is c. 21db below pep. > > ### I have a 2 x 4-400 G2DAF linear. About 900w out with 75 w of
By pentalab <jim.thomson@...> · #953 ·