This should be measurable. In class A you could just bias up the amplifier and measure it, no? Other classes are more problematic because they are non-linear and you'd need to have them producing pow
It's not just amps. I recently had to replace my electric kitchen stove. Remember the electric stove? The kind that used to last for 50 years, maybe you need to replace an element now and then? Mine
I'd like to help a friend add 10 meters to his LK500-ZB. Do you know the component specs for the kit? Particularly if you know a plug-compatible relay and values/dimensions of the inductor and the tr
See here: http://mysite.verizon.net/carlclawson/Amp/813amp.jpg Cheapest piece of ham gear I ever bought if you figure it by weight. It's the old ARRL 2 x 813 grid driven "single band kilowatt" desig
There is another aspect to this sad yet funny tale, which is rampant in our society: innumeracy. People generally have no sense of magnitudes or estimation skills. When the newspaper accidentally pri
Anyone have an idea of a favorite failure mode that would cause visible and audible arcing in the tube compartment? I'm trying to repair one. Put 10 or 20 watts drive to it with the tune controls at
Well, I was looking at the plate current meter when it happened but my impression was that it was around the top of the tube compartment, possibly arcing from the plates to the cabinet or thereabout
Thanks all for the good advice, on- and off-list. Closer inspection shows a new-looking crack along the edge of the HV bypass cap at the bottom of the plate choke. Also, that area is very well coated
And thanks again. The cracked bypass cap was a red herring but I replaced it anyway. It was arcing across the plate blocking caps where there was a distinct carbonized trace situated just where it w
Well I'll broadcast my ignorance here...I've never heard of a Teflon disc cap. The only Teflon RF caps I remember are the Russian "doorknobs" which are actually shaped more like a barber pole than a
Yes, they're red and (going from memory here) labeled MDC. -- Carl WS7L _______________________________________________ Amps mailing list Amps@contesting.com http://lists.contesting.com/mailman/list
What do you know about their construction? Is it some kind of teflon/ceramic combination? I'm a bit puzzled by the presence of the temperature code, which I associate with ceramics. But I suppose any
... don't run em over So, anyone know the technical definition of "working voltage" if it isn't the, um, voltage the capacitor can work at? Don't you just love specsmanship? Incidentally, I understa
Thanks, that's what I usually hear when I look into electrolytics. And I think you hit the nail on the head with spike suppression...that may be the reason that operating with a safety margin is reco
Vic, I run a pair of grid-driven 813s, actually a number of pairs. See the "single band kilowatt" in ARRL handbooks from the 60's, may also be there in late `50s. Plus, the article's available to mem
My junk box holds a couple 28F2023G11 caps, 32 uF @ 4500VDC. I can find no specs for them on the web. I'm curious if they have a ripple current spec that would qualify them as suitable for a 3 kV @ 1
I've enjoyed all the back and forth over HV connectors on this group. I've become quite positive towards SHV connectors but for one thing: where do you find short lengths of HV rated coax? As far as
Someone posted a link from GM3SEK the other day which I'll repeat here: http://www.ifwtech.co.uk/g3sek/in-prac/hvpsu.pps (I couldn't read it in my browser for some reason; had to download and open it
Hi Marius, Your scenario can happen. I recently saw B- arcing to the chassis through the insulation on low voltage wiring in an LK500-ZB amplifier. It had suffered an HV arc during which the grid met
Gary, The scenario begins with B+ being shorted to ground by some kind of fault. This tries to drive B- negative because the power supply is attempting to maintain a voltage between B- and B+. If B-