The only reason for using MHV over SHV is price. I can get quality, Western-sourced MHV connectors for $13 USD and SHV from the same sources are $42 USD. But you're right, SHV are safer and can't be
I have one 8877 that runs 4200 or so in cut-off and another that runs around 4100. If the tube is in good condition and has some recent hours on it I wouldn't worry about it. If not sure, send it off
A related "gotcha": Many people are under the impression that OTA television is now strictly UHF, and lots of UHF-only "HDTV ready" antennas are sold. It isn't true, though. There are still stations
Probably extruded HDPE, if it has a greasy, flexible feel to it. Not stable in sunlight. Cast is better, but still not UV stable. Cast acrylic is not quite *as* cheap, but machines well, is UV stable
In case anyone cares about the actual value of the 160m add-on toroid as shipped by RF Concepts: Measured at 1 kHz with an impedance bridge: 33.97 uH Measured at 1.9 mHz with a scalar analyzer: 33.8
I don't see why not. I used a 10KV oil furnace ignition transformer and it worked fine. Rectifier block, HV resistors and caps came from fleaBay. Careful - the cases on HV transformers aren't always
Perhaps a bad attitude, but I for one appreciate lower drive requirements for high(er) duty-cycle modes. (RTTY, SSTV, AM ...) Let's not give that up for fear of overdrive damage - a front-panel mode
I don't see what's controversial about and of that, just common sense. I think the problem is more that people who are thoughtful about the way they operate only occasionally need ALC and other prote
And we have conflicting opinions on the IC-7600 . I bought one within the 30 days or so and while I think it's a poor fit for me for other reasons I haven't had it connected to an amp yet and am curi
I don't have a GS-35B here to fiddle with (I do have a Alpha 76A) but here's what I wonder: (1) Is there room for the (roughly) 4" diameter anode cooler horizontally and the 5.33" vertical profile, l
Rick's question about refitting an Alpha 76/78 with a GS-35B got me thinking again about about using an 8877 instead. I have several good tubes that have been sitting around for years, and now that I
Thanks to all that replied, both on the list and privately. As soon as I get my current (and hopefully last) PA77 project off the bench, I'll open up a 76A for measurement and study. My guess is that
Sorry - they don't go by that acronym, but "Toroid Corporation of Maryland" is a mouthful. :-) http://www.toroid.com/standard_transformers/transformer_kits/transformer_kits.htm 73, Jim N7CXI ________
Looking at 8877 HF amp schematics published on the net I came across two designs that raised a question: The two I'm talking about are the Henry 3KD Premiere, and a QST article also for a single 8877
Thanks for all the replies again, on and off the list. Paul, In the case you describe, if there was a flashover arc to the cathode and the filament wasn't at the same DC potential, I think a secondar
After owning a HF-2500DX for a while, I'd probably buy QRO's new 8877 over a new Alpha, and it has nothing to do with money. Crude as they may be in some respects, the QRO amps will be repairable 10
EBM-Papst G2E108-AA05-44 Enough "oomph" to overcome normal chassis back pressure and also push air around a 4-inch, 90-degree acoustic sweep and out six feet of 4-inch hose. Cast aluminum housing, ro
I have a 100mHz Rigol dual-trace DSO. I haven't put it to any exhaustive tests, but so far have no reason to complain. It's small, (but has a decent color display) light, fairly accurate and saves pr
I'm finally getting around to finishing the latest overhaul on my last Alpha 77. I had the blower rebuilt locally, but since I have everything open I'd like to replace the blower snap-disk thermostat
Charles, I can't account for their current-carrying, (haven't used one in an amp yet) but I used one in my BVT/HiPot with peak/DC output up to 15KV and have had zero issues. I do have them laid out o