Somebody was asking abt how high you can safely operate a typ 450 v lytic. Per Cornel dublier's eng notes, buried pretty good, they say..[ and I don't know if this pertains to new ...'wonder caps' th
** The Drake secondary is 780/1065 VAC. The Heath is 860/1171 VAC. Where do you get your numbers from? ** Most of the SB-220 series I get thru here have good original caps. Get rid of the 30K heaters
** The Drake secondary is 780/1065 VAC. The Heath is 860/1171 VAC. Where do you get your numbers from? owner's, whose B+ is 3600-3790 vdc.. depending on their line vac. I know of a few.. who moved t
** That certainly wont happen with the SB-220. They use 8 and ripple has never been noticed on the air. That was a lot of uF in 1962-63. I used 330uF CDE 381LX Snap Ins on the rebuild of my 6M versi
... 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
... 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? folks seem to think you
IMO the only rule is the heat rise. If the ripple and ESR is low and the cap remains cool you can run it close to the max as long as turn on peak ratings arent exceeded. This also assumes spike suppr
Yeah, that's what I was always lead to believe. I was told that it is better to run your caps very close to their voltage rating. Dunno if its a wives tale or not. I usually sail pretty close to the
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
I get a bit carried away with spike suppression and fault limiting. Had an amp blow on me about 40 years ago and said never again! Carl KM1H _______________________________________________ Amps maili
Carl, What do you use for spike suppression and where do you put it? Across each cap? Across the transformer primary? _______________________________________________ Amps mailing list Amps@contesting
Roger, I use the usual cap bypassing at the input plus a HD LC filter (keeps RF out of the house wiring)built into each 240V metal outlet box. Then MOV's right inside the main panel at each breaker g
OK, this part I've pretty well covered. (Wish had a few of those really big ones we used at work, but they're a bit beyond my budget). OTOH I do have a whole box full of those for 120 and 240 VAC alt
Yeah, that's what I was always lead to believe. I was told that it is better to run your caps very close to their voltage rating. Dunno if its a wives tale or not. I usually sail pretty close to the
I usually sail pretty close to the wind. I work on having 1 spare capacitor worth of headroom in a bank. For example, if the dc voltage is 4500V, then I would use 11 x 450VW capacitors in the bank. N
Hmmm ... would this mean that the SB-220 and similar amps of that era should all have blown up by now (since we mostly run them on the SSB setting now? 73, Pete N4ZR The World Contest Station Databas
I usually sail pretty close to the wind. I work on having 1 spare capacitor worth of headroom in a bank. For example, if the dc voltage is 4500V, then I would use 11 x 450VW capacitors in the bank. N
ORIGINAL MESSAGE: REPLY: I was told that too, but never heard any real proof. The idea was that an electrolytic is not a static (pun intended) component. The electrolyte is chemically active and will
That's true. Electrolytics are based on organic chemicals in the "sauce" and these degrade with time, albeit it takes quite a time to happen. At a time in the mists of the past a number of us were ma
Grid trip and metering mods for the DTR-2000L were published shortly after it hit the market. I incorporated them in several before ready made circuit boards became available. Two cooling systems wer