[AMRadio] Re: Modulation transformer ID and repair

[Donald Chester]

>From: "Geoff/W5OMR" <w5omr at w5omr.shacknet.nu>

> > 3000VDC @ 300mA = 10,000 ohms. (This is where the transmitter lives
> > according to the notes I have on it)
>
>
>perhaps thats what it's capable of, but you're not going to run it there 
>are ya?

That's what the first high power homebrew rig I remember ever actually 
seeing ran - an old fellow in Kentucky.  He used a pair of 100TH's in the 
final, modulated with a pair of triode connected 813's and a homebrew 
modulation transformer.  His audio sounded like a tin can, but did he strap!

His rig inspired me to build a single 304TL final moulated first by a pair 
of 211's (@ 600w input) then later with triode/813's then 810's and later, 
833-A's.  My 866A's kept flashing over @ 3000 volts, using a pole pig, so I 
settled for 2500v @ 400 ma.  Besides that gave a better match to the 
modulation transformer.

Don K4KYV

_________________________________________________________________
Say “goodbye” to busy signals and slow downloads with a high-speed Internet 
connection! Prices start at less than $1 a day average.  
https://broadband.msn.com (Prices may vary by service area.)