[AMRadio] Ferroresonant transformer revisited

W5OMR/Geoff w5omr at satx.rr.com
Wed May 10 14:17:16 EDT 2006

> W5OMR/Geoff wrote:
>> Other than testing the filaments, no - I don't know of a way other 
>> than comparing it in an amp designed to use 'em.
>> Speaking of which, Rick... I've got an amp that someone started to 
>> home-brew, designed around a 450T.  Filament is 220v primary, at 7.5v
>> big peice of copper tubing for a coil, tapped for 80, 40, 20 and 10m.
>> And, I have a brighly glowing 450TL to go along with it.
>> If you're interested, I'll send some pictures of it.

> I don't know if I can afford it, but I'd like to see some pictures.  
> How far along is it and which parts are still needed?  I'm assuming 
> there is no HV supply, so what would it require about 2500 volts at 
> half an amp?

Except for the B+ supply, everything is there.

The 450TH/L, according the spec sheet, will take up to 6kVDC on the 
plate.  You'll likely need a bit more current...
450TH spec-sheet --> http://tinyurl.com/p5f85

73 = Best Regards,

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