[AMRadio] Viking II Power Mod

[W6OM]

Thanks Mel

Compelling observation.  I think it's worth a try and if it's not feasible I 
will just build a big fat 8-10 db attenuator.

I appreciate your thoughts, that is what I was looking for.

Ron W6OM

Phone:  949-533-7958

Fax:       949-559-6209

Skype:  Ron.Weaver3

This email and any files transmitted with it are confidential and intended 
solely for the use of the individuals or entity to whom they are addressed. 
If you are not the intended recipient, you are notified that disclosing, 
copying, distributing or fowarding the contents is strictly prohibited by 
law. If you have received this communication in error please notify me 
immediately by email and delete this e-mail from your system.

----- Original Message ----- 
From: "Mel Farrer" <farrerfolks at yahoo.com>
To: "Discussion of AM Radio in the Amateur Service" 
<amradio at mailman.qth.net>
Sent: Thursday, October 20, 2011 10:21 AM
Subject: Re: [AMRadio] Viking II Power Mod


Hi Ron,

Doing the screen mod will certainly drop the power but now the plate load 
impedance will be way off and off course you will need to really back off on 
the modulation drive. The tank circuit might make the change, but when you 
do, it will not tune to any normal setting and have proper modulation. It 
will work, but with the above reservations.

Mel, K6KBE



________________________________
From: W6OM <w6om at cox.net>
To: amradio at mailman.qth.net
Sent: Thursday, October 20, 2011 9:56 AM
Subject: [AMRadio] Viking II Power Mod

Greetings everyone. I have a simple question concerning my old Viking II. 
I am just finishing up a 3 X 813 linear and need to consider how to drive it 
with the Viking II.

Building a large attenuator is one simple solution with 8 - 10db of 
attenuation but then I recalled the Viking Ranger mod of a pot in the 6146 
screen voltage line to adjust the power out put for amps.

After studying the Viking II schematic and measuring the voltages I see the 
two 6146 screens are tied in together in parallel.

It seems rational to me to simply break the screen supply line and install a 
large 5 watt, 50 K linear taper pot on the rear apron to crank the power 
output down to drive the amp.

Anyone have any thoughts on the subject? Almost seems too easy...

Ron W6OM

Phone: 949-533-7958

Fax:   949-559-6209

Skype: Ron.Weaver3

This email and any files transmitted with it are confidential and intended 
solely for the use of the individuals or entity to whom they are addressed. 
If you are not the intended recipient, you are notified that disclosing, 
copying, distributing or fowarding the contents is strictly prohibited by 
law. If you have received this communication in error please notify me 
immediately by email and delete this e-mail from your system.
______________________________________________________________
Our Main Website: http://www.amfone.net
AMRadio mailing list
Searchable Archives: http://www.mail-archive.com/amradio@mailman.qth.net/
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
______________________________________________________________
Our Main Website: http://www.amfone.net
AMRadio mailing list
Searchable Archives: http://www.mail-archive.com/amradio@mailman.qth.net/
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