[JMS] 90881 progress

Thu, 11 Mar 2004 15:20:05 -0700

Cal,

Are you planning on using a choke in your power supply?

Jim, W8KGI

----- Original Message ----- 
From: <[email protected]>
To: <[email protected]>
Sent: Thursday, March 11, 2004 2:33 PM
Subject: [JMS] 90881 progress

>
> All:
> Decided to press on with more expenditures toward the amp. Got a 28" 
> compact cabinet to house the 90800, 90881, and 90831 units plus a multiple 
> output power supply for all units. Cost was WAYYYY high. But I'd probably 
> have to wait to find a cabinet to house everything and and I don't have 
> the time as I will be "moving camp" within a month. Also, the cabinet is 
> perfect so maybe I shouldn't cry over the price.
>
> Other than that, I started on the amps high voltage power supply. I made a 
> full wave bridge of the four 6kV .5 amp diodes and a pair of 100 ohm 10 
> watt resistors. I took a look at my bank of four 400 vdc/560 uFd caps. 
> Dimensionally, they weren't going to cut it. Instead, I have three 100 
> uFd/450 VDC caps that have a smaller footprint. I figure I will still have 
> just enough headroom for the voltage and have sufficient filtering (about 
> 33 uFd after putting all of these caps in series).
>
> Amazingly, all will fit within the cabinet. Just a note: I was taking a 
> look at the latest ER (Electric Radio) which a man on the cover was using 
> a 1939 Collins transmitter. In another section of the magazine, WA9MZU was 
> discussing the Collins 30 FX and the RCA ACT-200. Oddly, my Millen 
> transmitter looks a heck of a lot like these oldies, although slightly 
> younger (1946).
>
> Cal, N6KYR
>
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