[AMRadio] Bias Battery

Greg Mijal bluebirdtele at embarqmail.com
Sun Nov 8 10:53:11 EST 2009

Hi Jim:
Someone did find a source for the 22 vdc battery so you should have that 
info shortly.  My AF 67 uses three 9 vdc batteries and a couple of hundred K 
resistor to get the bias dead on.  There is space on the top of the chassis 
on the right had side to velcro in the 3 battery pack.  I'm running my AF 67 
with a Swan MK2 amplifier and Collins R 388 for 200 watts of carrier.
The old Elmac is a very reliable AM transmitter and I'm sure you will enjoy 
Kinston NC
----- Original Message ----- 
From: "Jim Wilhite" <w5jo at brightok.net>
To: "AM Radio Discussion List" <amradio at mailman.qth.net>
Sent: Saturday, November 07, 2009 8:31 PM
Subject: [AMRadio] Bias Battery

>A long time ago I remember someone or several someones talking abut the
> modulator tubes bias battery in the AF 67/68.  It is a 22.5 volt battery
> that I am going to need.  I don't recall if the discussion turned into
> how to get the needed voltage from something in the radio or the battery
> is still available.
> Can someone enlighten me on the subject?  If the battery is available,
> where?  If a modification was performed, how, and where can I get a
> copy?  Or are both solutions plausible?
> TNX & 73
> Jim/W5JO
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