[AMRadio] Thordarson 6699/Heaven help the neighbors

[Ka9p at aol.com]

I should know better but............in cleaning out the transformer bin in 
the shop I found a Thordarson 6699, which looks to be a medium power mod 
transformer marked P/B/P on one side and C/500/3500/6250 on the other.  Does 
anyone have specs on this puppy, or a rule of thumb I could use to figure out 
approximate power it can handle?

What I'd like to build up is a simple 2 (final) tube modulator modulating a 
simple class C final, with a common power supply voltage and somewhere 
between 150 and 300 watts output of fully modulated AM.  My neighbors haven't 
voted yet.  Can anyone recommend a favorite set up that fits these numbers? 
I'll admit to being a bit lazy and not having done the math yet, but thought 
I'd ask first - it would be too good to be true for a pair of 811's 
modulating a 4-125 or an 813 to work, I imagine.  Any suggestions greatly 
appreciated.

And is there any problem with running a mod transformer at 1/3 or so of its 
rated power, other than having to lift it :)?

Also I picked up some other Thordarson chokes and xfrmers only having 
Thordarson numbers on them - I naively assumed someone might have a web site 
up with that type of info - did I miss it?

Thanks, Scott


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