[AMRadio] Transformers Revised


gkb gkbrown at gwi.net
Mon Feb 19 06:02:54 EST 2007


Kinda scratching my head here, if the primary voltage is passing thru a
rheostat, why the need for 100 volt primary trannys?
Regards,
Gary...WZ1M
----- Original Message ----- 
From: "ARS W5OMR" <ars.w5omr at gmail.com>
To: "Discussion of AM Radio in the Amateur Service"
<amradio at mailman.qth.net>
Sent: Monday, February 19, 2007 12:51 AM
Subject: Re: [AMRadio] Transformers Revised


> On 2/18/07, Rick Brashear <rickbras at airmail.net> wrote:
> > I just made a discovery.  The BT-20-A broadcast transmitter uses several
> > filament transformers for the various stages.  All of them are rated at
> > 100 volts AC primary.  All of the primaries pass through a voltage
> > adjusting rheostat and volt meter to insure proper filament voltage on
> > all tubes.   So, my earlier request for a 115 vac primary filament
> > transformer was wrong.  It needs to have a 100 vac primary.
>
> I've seen a lot of filament transformers that had 0 - 100 - 105 - 110
> taps on the primary, with one secondary.  They're out there, Rick.
>
> What voltages do you need?  I might have one.
>
> --
> Operating your AM rig without a scope
> is like driving our car at night without headlights.(~K4KYV)
>
> 73 = Best Regards
> -Geoff/W5OMR
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