A while back I went through the calcs in the Amidon reference book trying to find a way to stack a bunch of Mix 2 powdered-iron cores for the 160m "helper" inductor in a legal-limit project. I don't
RF Parts shows Taylor (foreign, I assume Chinese) 813's for 49.95 USD apiece. $100 sounds like a cheap kilowatt to me. 73, Jim N7CXI _______________________________________________ Amps mailing list
Having just sold most of my old iron, (there was alarming talk of a "basement singularity") I'll mention that a Flex 5000A with a good mic and an adequately-powered 8877 will make exceptional legal-l
Not that I'm the shiniest coin in the jar, but I've had nothing but compliments on the audio, both on AM and (E)SSB. Of course - you do need to set up a correctly-shaped transmit filter, then set the
I have a 3KA that "talks" under high drive levels and I've wondered if it was the PS choke. Never worked up the motivation to try to isolate it, though. I wonder (yet again) if that says anything abo
Interesting side-thread. I've been thinking about replacing my black-faced Alpha 77 with an AL-1500, primarily because the Alpha doesn't have 160 and I don't like the nature of the "upgrade" to put i
The peak flow meters I found in a casual web search all go up to 800 liters/minute. Assuming I'm converting units correctly, that only works out to roughly 28 cubic feet/minute. Just as an example, t
I wonder if a hand-held anemometer would have significant back pressure? It's fairly easy to convert flow rate to volume if the duct size is known. Inexpensive units go for 20-30 USD on eBay. The "Ba
Not to run it into the ground, but does this look right? (in US units) . Construct a duct of heavy paper to match/mate the air output duct on the amplifier, tape it to a US-standard 33-gallon trash b
Not my idea, just trying it on for size. Ian mentioned who thought it up originally, but I've forgotten already. What were we talking about? ;-) 73, Jim N7CXI ________________________________________
The NTE cross-reference comes up with NTE-112 . A metal-to-silicon junction diode in a DO35 package primarily intended for UHF mixers and ultrafast switching applications. Delicate critter - only 30m
Here's a link to an image of the tank inductor I recently had made for my YC156 amp project. It was made by Viking/Cardwell/Multronics, model # M47-15V . It's 47uh maximum, rated at 15A continuous: h
Urban legend and a few old hands have it that the 3-500Z is the exception - the anode has the getter material. Since all the newer-style ceramic triodes most certainly do have the getter in the catho
I wasn't paying attention when the beginning of the thread marched by, thus the bad timing. So: center-tap the 10m coil with the Tune C, then just leave the "left-hand" end open? The YC156 suffers fr
Thanks, Jim. And by using two coils (as you mention) I could keep the big roller in place that I bought for the purpose. OTOH, using NOS vacuum relays instead is looking more attractive in case I dec
I've reached the point where I need to decide whether or not to make my YC156 project amp "remote". Because of other interests, I already have a good selection of larger stepper motors and drive elec
Jeff, Thanks for the reply. True 'auto-tune' would require Ip, Ig, RF and other inputs back to the controller(s), which may require more work than my lazy self is willing to do at this point. I do, t
No argument here, but you still have to have zero and full-range limit indicators, or "stops". A shaft encoder (or just counting motor steps, which is what I would probably do) gives you relative pos
Aha - now I see what you're getting at. At least up until this point I've been cynical about drive reliability, so have insisted on physical feedback. What you're describing will work, but my cynical
Very interesting, Martin. Thanks! This leans back more toward what Al was talking about, but keeping track of the states becomes Someone Else's Problem. :-) I'll check these out. 73, --jim Jim Barber