You might want to look at a link that does not swing, but instead has a series capacitor. That's what I've used for years in my balanced antenna tuner. The links are pretty much the same IIRC, but I
Here you go. Hope this helps.: http://www.w0btu.com/files/antenna/W0BTUBalancedTuner3Coils.jpg As you can see, the fixed link coils were B&W HDA. The swinging link coils, HDVL. 73 Mike www.w0btu.com
If you decide to buy an SB-220, be warned that 3-500Zs that sit idle for years can go bad. Do yourself a favor and Google '3-500z gettering'. If you decide to buy either an SB-200 or SB-220, be aware
If I sounded like I didn't like the SB-220, I didn't mean to. I was simply warning the OP of a real problem that he is likely to run into if he purchases an amp with 3-500Zs, if that amp has not been
100 kV is safe enough, provided that it's current limited. I've built custom industrial negative ion generators, which were basically current limited -DC power supplies. The arc length at >50 kV was
3-500Zs are notorious for going bad after sitting for awhile. I suggest you study this thread and the links there: http://www.eham.net/ehamforum/smf/index.php/topic,72672.0.html 73, Mike www.w0btu.co
I never would have guessed that teeny little relay would be suitable for an HF legal limit amp! Thank you for that, Jim. Going to order a couple of those soon. 73, Mike www.w0btu.com ________________
Exactly. It wouldn't take hardly any loss at all for a connector, switch, or whatever to get warm fairly quickly when power was transferred through it. If it did have significant loss, you would bur
Actually, the loss from a "UHF" connector would be in the coax, not all concentrated in the connector as I previously stated. I just got the following private e-mail that nicely explained that: "Whil
I'm not accusing Alpha of anything underhanded, but this kind of bothers me. But I guess in the absence of any hard evidence that they've ever used this to unjustly get around having to replace a tub
This article is in the 1980 ARRL Handbook, showing a grid-driven 833A in linear service. But I have never heard of anyone actually trying it, and I've done many Google searches. http://www.w7ekb.com/
I appreciate all of the replies, both on and off the list. K0UYA is the only one who replied who ever built one. 73, Mike www.w0btu.com _______________________________________________ Amps mailing li
Well, two grid-driven 833Cs in parallel may or may not be as linear as the best expensive ceramic triodes in G-G. But if it's linear enough not to make my signal much wider, it's good enough for me.
Gary (et al), How about adding a tertiary winding to the step-up transformer, and use that for the out-of-phase neutralizing signal? One end of the winding to ground, the other end to a neut. capacit
I'm layout out a 160m legal limit AB1 amplifier design using two parallel 833-C tubes, and a thought occurred to me: Why are two parasitic suppressors always needed (one for each tube)? Of course, it
of using one parasitic suppressor per tube is just "habit", that is, "But, we've ALWAYS done it that way!". This is regardless of how well the components are laid out for minimum lead inductance, et
Well said, Bill! That's exactly what I had in mind. 73, Mike www.w0btu.com -- Forwarded message -- _______________________________________________ Amps mailing list Amps@contesting.com http://lists.c
The filament of either an 833A or 833C triode is rated at 10 volts at 10 amps per tube (in a number of tube data sheets I have AND the tube manufacturer's web site). However, all six graphite-plate C
I discovered some new (to me) information on maximizing the life of amplifier tubes with thoriated-tungsten filaments. I just uploaded it to: http://www.w0btu.com/miller-larson_effect.html Basically,