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Hello, Frank == A HV fuse in the secondary does not protect the HV- transformer any better than a circuit breaker in the primary. cheerz R L Measures, AG6K, 805.386.3734 r@..., , rlm@...,

Hi all: I am about to finish my HV power supply. One thing missing still is an appropriate HV fuse to be put between C bank and glitch R. While closely examining the pictures in the photos section of

Larry, This bound to have been in the early 70's or so. I had a GTE/Philco 19" TV I took in as a trade in and I played it myself for about a year before I sold it. I can't remember if it was all solid

All, I finished coding the first portion of the long formula calculations in imperial measurements for the Maxwell Transformer Calc. When the results are compared to the short formula for 12 kilogauss

pentalab wrote: <snip> I will measure this tomorrow and report back the difference between the measured anode to grid capacitance unmounted and sub-mounted.

craxd wrote:

thoroughly the If I recall, I found some errors about calculating anode current, or the terms used with it in the ARRL Handbook. It was contradicted by the RCA Radiotron book. There was a discussion

IMExperiences, it takes c. 11g of force for c. 30-seconds to unbend the midpoint of a 3-500Z's filament helices far enough to straighten it following an intermittent VHF parasitic oscillation. Thus, I

Anecdotal sure-cures don't cut the parasitic mustard.

The League seems to be somewhat less than serious about thoroughly updating and improving the Handbook. Example: In 1994 I got a letter from the League asking me if I was interested in improving the

ORIGINAL MESSAGE: wrote: ------------ REPLY FOLLOWS ------------ I'm sure there will be a few guys who know how to repair a tube radio or TV but they will become a rare breed, much like people who can

Jim said: #### can u do... say 1 kw out FM, on 29.6 mhz... with a 2:1 swr ??? Scratch that... RG-58 is only good for 450 W on 10m.. with a flat swr. I suppose a guy could use $1.10 per ft Teflon

wrote: ### OK... I'll bite... why does a Glitch R prevent Grid- filament shorts on a thoriated tungsten tube ?? it, overkill is not good engineering - except perhaps on a moon mission if I going. ###

which will do 1KW dead carrier all day long. RCA chose to use a dual Dow-Key coax switch with BNC connectors for the input and output to the antenna. RCA was known to overengineer (at least still in

600w of drive.. it should do 30-36 k out. I can't imagine dealing with the problems of paralleling 3 YC- 156's. He needs a 15k or 20k! not desirable unless one is trying to build an oscillator. The

To prove Rich's observation about caps blowin up when the eq resistor opens.... I'm proposing a test. Using a variac.... dial it up so +400 vdc appears across the string of 8 x caps [50 v per cap]

I have a RCA SBA-1K Radio-marine amplifier, (2X 3-400Z's at 2800VDC) which will do 1KW dead carrier all day long. RCA chose to use a dual Dow-Key coax switch with BNC connectors for the input and

Good Morning: Many thanks for the response. That was what I suspected but wanted it verified. 2-3 years ago I resurrected a Heathkit Warrior. It had been mercilessly cannibalized. Essentially nothing

Paralleling 3 tubes triples C-feedback, and that is not desirable unless one is trying to build an oscillator. The tube that is best suited for 20k - 35k out is the 8281/4cx15000A. 200w will drive one

Fast fuses pop like popcorn in C-filter power supplies.