I agree, it sounds like something 73 would have run. An amp with a half dozen tubes sounds like something from 11 meters. I'd shoot for fewer, bigger tubes myself. My experience and recollection rega
There's nothing wrong with doorknobs, but you have to get the right kind of doorknob. A class 2 RF doorknob specified for a few amps at 1000 KC is in my experience far better in a 160 m. output netwo
Sounds like a pretty good amp but you need to find a buyer who appreciates the 4-1000A and knows how to run that tube with h.v. They're great at around 5 to 6 KV. 73 Rob K5UJ ________________________
You imagine incorrectly. Even brand new HEC 15 KV is about half that price. No, they don't use them because hams are cheap customers, most don't know any better, the duty cycles are usually low, and
The only thing that matters is that the replacement fan conform to the dimensions of the original so it can be mounted with the factory drilled or punched screw holes, and that it _at least_ blow the
Saddened to see Bill W6WRT listed in July QST Silent Keys. 73 Rob K5UJ _______________________________________________ Amps mailing list Amps@contesting.com http://lists.contesting.com/mailman/listin
There's absolutely nothing wrong with a center tapped FW rectifier, choke input design power supply since the mode is RTTY which is non-dynamic; therefore, the power supply can employ a 10 Henry chok
I always thought the way to make a h.v. fuse was to bolt a pair of ceramic standoffs in a convenient location, making them around 2 or 3 inches apart, and stretch a very thin gage copper wire between
Sometimes we need a little excitement to have something to talk about when ragchewing, hi hi. Rob _______________________________________________ Amps mailing list Amps@contesting.com http://lists.co
Where and how a plate choke is mounted mostly has to do with making the best use of chassis real estate and heat dissipation. Someone mentioned that the famous Ameritron choke, popular because it can
You got a lot of answers, a lot of words, some or all correct, but not what I think you were looking for. A tube (triode for example) is like a ball valve in a water pipe. You can change the flow by
There's utterly nothing that suggested what you write. It is assumed that everyone knows current flow is in the opposite direction from electron transfer. That's one of the first things taught in ele
The RF PA is class C p.p.; When cathode emission dropped the RF final PA tubes were moved to modulator use, not the other way around. Vintage p.p. RF PA rigs are out there and still in use. The Globe
Why do you want to use dielectric grease? I would use a conductive grease for this. 73 Rob K5UJ _______________________________________________ Amps mailing list Amps@contesting.com http://lists.cont
Conductive grease is usually grease impregnated with particles of silver. As such, it is expensive. Most users apply it minimally and sparingly, I doubt if Jim is so stupid that he'd inundate his rol
.Generally, Ive used a thin coating of dielectric silicone grease for That might be the case with a good roller inductor but in that case is any lube needed at all? Maybe in a remote assembly outdoo
Econco rebuilds external anode tubes of a certain size. They won't deal with anything below around 2500 or 3000 watts plate dissipation. Small tubes for ham like 8877s can't be rebuilt. You may not b
That is way way way too much capacitance. With a filter choke (choke input filter) you probably only need at most 10 to 20 mfd capacitance. You have around 20 times too much and that's probably why
Look at how much all those fancy watt meters cost. If you have a Bird 43 or something else already, get a $30 camera, put it in front of your watt meter and connect it to your computer or network lik