|[AMRadio] Drake TR-4|
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.
----- 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
> Bob kc0hfl
> Our Main Website: http://www.amfone.net
> AMRadio mailing list
> Searchable Archives: http://email@example.com/
> List Rules (must read!): http://w5ami.net/amradiofaq.html
> List Home: http://mailman.qth.net/mailman/listinfo/amradio
> Post: AMRadio at mailman.qth.net
> To unsubscribe, send an email to amradio-request at mailman.qth.net with
> the word unsubscribe in the message body.
> This list hosted by: http://www.qsl.net
> Please help support this email list: http://www.qsl.net/donate.html
More information about the AMRadio mailing list
This page last updated 18 Oct 2017.