[AMRadio] Drake TR-4

Greg Mijal bluebirdtele at embarqmail.com
Wed Apr 8 16:55:01 EDT 2009


Google: Drake List.
If it's still on the WWW it's a good resource for repair those ducks.
Kinston NC
----- Original Message ----- 
From: "Robert Perdue" <kc0hfl at cox.net>
To: "Discussion of AM Radio in the Amateur Service" 
<amradio at mailman.qth.net>
Sent: Wednesday, April 08, 2009 11:34 AM
Subject: [AMRadio] Drake TR-4

>I have a TR-4 that keys up as soon as the tubes warm up. Replaced the 6EV7 
>no luck. Checked negative voltage to pin 2 of the 6ev7 it is down to 4 
>volts vox and antivox have some effect on the voltage I can put the tube 
>into cutoff with -10v I have very little Drake experience any help would be 
>appreciated. Both pots check good on vox/antivox as well as bias supply 
>from power supply and plate voltage is good to the 6ev7 is this a common 
>problem? Thanks.
> Bob kc0hfl
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