开云体育

I think Lou has it worked out but I love your bit about the butt off the chair. That's why I love building and working i=on tube amplifiers. Every now and then you get one of those incidents and the

You might want to put a 0.1UF to 1UF non-polarised capacitor across the contacts if there isn't one. This is usually done to prevent arcing across AC contacts. Clint, VE3CMQ

Cliff, Is it a bang or a BANG ? A tick or a TICK ? a snap or a SNAP ! ? Do you hear it across the room ? Does your butt lift off the chair ? Just trying to gauge the severity. Don W4DNR

The arc is normal, just about all of them do it to some degree based on how bad the contacts have been pitted.? Eventually the step start relay may need replacing.

The arc is at the step start contacts just as it makes contact to short out the step start resistor.? The delay is a bit short.

The Step Start relay arc is normal.? They all do it when the start is on an AC cycle peak or close to it.

Yep. Take off the cover and get something to hold down the cover safety switch. Activate the power switch and then plug it into a live extension cable to apply the power. That way, you are holding the

FWIW, keep one hand in your pocket while doodling with it. Andy? K9ATX

Being curious, what exactly is arcing? Andy? K9ATX

No, not yet Alek, I'm planning on taking the cover off it tomorrow afternoon. One guy in Idaho told me the step-start relay may be the culprit or it could need the electrolytic caps replaced. If I

Have you determined where the arc might be? Bandswitch, RF deck, power supply, power switch, transformer, filter caps, etc? 73, Alek. VK6APK

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]