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I have a Ameritron AL-1200 brought to me by the KN4UNA, P.J., who received the amp from his uncle's estate (W4WWF Dale Mash SK) and it has a problem with giving a arc when the power switch is first

The Marconi transmitter at BBC Wooferton used a water cooled vacuum capacitor 1nF 44kV as a coupling capacitor. https://www.youtube.com/watch?v=3-apAt9U4ZI

shoulda? read...... with the? application? of? DC. Jim VE7RF

Yes? I? realize? 95%? of? MW? these? days? are? SS......? I? was? referring? to the? older? tube? pa. Fixed / variable? ?vac caps? have? to? be? severely de-rated? for plate

a linear fo AM is just a bad idea. They are 25% efficient at best. AM broadcasters largely gave them up 80-90 years ago. The Doherty version is a much more efficient option but still less efficient

sw broadcast TXs use vacuum caps. MW transmitters are all solid state except for the very old ones. SW TXs 50KW and under are also mostly solid state these days as well.

He's? got? it? mounted? on a piece? of? fiberglass.? ?He? shoulda? used? nylon? screws? to? mount the? fiberglass to the? rear? wall....and? also? another? pair? of nylon?

I? went? through the? entire? pdf.? ?They? state the? mica? caps? are? designed? for? 100? khz? to? 3? mhz..that's? it. Then? the? graphs? depict current? ratings? from?

Interesting that he uses one of the 'Millen HV connectors' that are supposedly only rated at 2500VDC to bring his 6500VDC in! Mod-U-Lator, Mike(y)/W3SLK From: [email protected]

Not always: https://www.cde.com/resources/catalogs/HVOLT-CYL.pdf 73 Peter _____ From: [email protected] [mailto:[email protected]] On Behalf Of Jim VE7RF Current rating on mica's

I'd be? more? worried? about? the? current? rating..vs? V? rating.? ?What? bands are? you? planning? to? use..and? what? tube(s) ?? ?If? u? are? using? tubes? with? typ

Many thanks for that Peter. At 10kV peak working that capacitor looks to have a much lower rating than mine. 73s Tracey G5VU

Seems to work https://www.qsl.net/kf8od/3cpx5000.html 73 Peter _____ From: [email protected] [mailto:[email protected]] On Behalf Of Sharalyn Koeppe Sent: Sonntag, 19. Januar 2020 23:12

I have understood that mica is not suitable for plate blocking due to dielectric migration from the DC applied. 73,?? Roy??? K6XK

I have an 1100pf large block shaped Dubilier mica capacitor dating from 1944. It measures approx. 3.75w x 2.25d x 3.25h inches It states on it that it was tested as follows (a) 6 amps at 300kHz for 1

OK, I? downloaded? the? entire? catalog on? that? series.? ?Most? are? rated? at? c 100 Amps? of? ripple? current....? but? at? lower? ambient? temps.? ?Per? cornell? dublier?

Re[2]: [ham-amplifiers] Interesting High Voltage capacitors Friday, January 17, 2020 In an RF amp where might be appropriate to use Teflon capacitors? Best regards, Chris 2E0ILY

Those are DC link Capacitors. I have used them for years now in amplifiers. Not that brand though.? I used the 944U. They make them up to 1.4KV at 70UF.? Or 1.2KV at 100 UF.? That is full working

G'Day Jim, You made a very good post to round-off this entertaining thread of posts largely by Ned Flanders type insufferable puritans. My other two takeaway quips from the most amusing read were

I? downloaded? their? entire? catalog? in? that? series.....4? days? ago.? ?Now? I'm? having a helluva? time bringing? it? up. Can't? remember? if? they? stated? ESR at?