Brett gazdzinski wrote:
I would not buy anything from MFJ!
The transformers are Ameritron for whatever that is worth.
Why the big hurry, wait to find a good transformer, they are around.
I have wanted one of these since 1955. I have waited long enough besides, at my age, time is at a premium.
What ratings are you looking for?
Good question. Actually, I was going to post a question so I could answer that one.
I can't make any sense out of the 813 specs, either in the Handbook or the data sheet I got on line.
As near as I can tell, the "typical" voltage for AM is about 1300 but I see the Maul talking about 2000. I see plate current at about 150 but I see elsewhere 250. I am sort of confused but think that 2000v ct at 1/2 amp would do the job.
Is it supposed to fit on the deck over that big hole?
Roger.
Fair radio used to sell a nice oil filled Collins transformer, 2250 volt ct at 650ma, 110 or 220 primary. With a variac that would give 0 to 1500 volts.
I don't see anything like that on their site but I will check further.
Its always much better to go with choke input, much better voltage regulation, much lower startup surge current.
With a cap input, the voltage will increase quite a bit, but will sag big time under a load.
Good info. I read somewhere about needing some sort of step start and mine has a time delay relay but it doesn't seem to have anything to do with charging caps. It connects to something in the RF deck which I haven't run down yet. It has a high/low switch which applies either 110 or 220 to the primary of the HV trans. Would this be adequate step start?
What are you going to run off the supply? 8UF is not very good for a modulator, I always go around 40UF for energy storage.
Unfortunately, I want to run the modulator and rf deck from this supply. That would be 813's/811's.
This package I bought was a linear so that could explain the too low cap? js -- PHOTO OF THE WEEK: http://schmidling.com/pow.htm Astronomy, Beer, Cheese, Fiber,Gems, Sausage,Silver http://schmidling.com ______________________________________________________________ AMRadio mailing list List Home: http://mailman.qth.net/mailman/listinfo/amradio Partner Website: http://www.amfone.net Help: http://mailman.qth.net/mmfaq.html Post: mailto:[email protected]
