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There are a couple over here in Europe. So does that mean European hams are brighter! :-) Linear Amp UK sell their 4 x 811 amp as a kit And in Denmark Dan's amps

Bill, how sad, but true. I am amazed at the number of new licensees in the local club, some Extra Class, who don't have the foggiest idea how to calculate the length of a dipole, or how to put it up.

Good Morning Gary & All: Thanks for the comments. Nope, never have worked for Lufkin Industries. However, your comments started me thinking about the amplifier projects I have done in my life as a

ORIGINAL MESSAGE: wrote: ------------ REPLY FOLLOWS ------------ Perhaps it could be done with blank metal pieces and a paper template for the builder to drill and finish himself? Your other comments

? What failure does the HV fuse protect against with thoriated tungsten filament tubes?

Nice pix of the 6 mtr project. Looks like you have done layout work before. Living in Lufkin, TX, do you work for the measuring device outfit? Have an old Lufkin 50 ft. tape measure that must be 60-70

pentalab wrote:

pentalab wrote: <snip> There's nothing better! > <snip> Jim, have you considered sub mounting the tube? Current methods dictate cutting lots of holes around the tube to allow the air to flow. If you

repairing 500 pf prevent grid- filament shorts. ### agreed... when stuff "goes nuts"... the glitch will LIMIT current..... precede the glitch with a HV fuse... and that combo is excellent. Come glitch

Kathy&#92;(K5MWH&#92;)" <w5uc@...> wrote: 6 mtrs see my #### then click on..."stuff" I tried the pi net for my tuned inputs.... and it's slick.... since it does ALL bands at once. By tweaking the Q in

### Have not tried this... yet. You would have to anchor it down to the chassis... otherwise, it would obviously get blown through the celing ! Since our local plastic shop has miles of thin teflon

In my experiences, a suitable glitch-R in the HV+ helps prevent grid- filament shorts.

Will, I agree. When you design a transformer for 10 KG there is an oversized core or extra windings both of wich increase the resistance losses. This same transformer at 50 Hz. will be more efficient

Materials like kapton insulators are rated at 7000 volts / mil do a better job than a layer of paint. This is required when you build high voltage transformers. Low voltage you can rely on wire

Thanks who reply about my questions. My teacher in university, Prof. Chen, He often made some R xfmr,use 100VA iron for 180VA xfmr, he do like this,primary and secondary must need apart.Use as thick

Gents, It would do us all good if we tried to make our subject line match what we talk about in our postings. Otherwise, the thread is completely disjointed and very difficult to follow. When the

Francis, If we took a transformer say designed to run at 10 kilogauss, but the iron would run okay at 12 kilogauss, then dropped the frequency down to 50 Hz, it would probably be okay since the flux

I received a lot of interesting posts when I asked about repairing a grid bypass choke fire on a customer's SB-220. The most suggested fix I received was to strap all grid pins to chassis ground,

Will, I lived it once and was unable to make the loss equal for both 50 and 60 Hz. I got close but the 50 Hz high line started to suck current. frank wa1gfz craxd <craxd1@...> wrote: Francis,

Francis, Yup, your right. I was going by the difference in the two formulas between 50 and 60 Hz. Both sets have a difference of 1.2. See below; For 60 Hz TPV = 4.85 / A A = 0.1725 x sq rt of P P = (