[AMRadio] A bit of Viking Valiant help


GBrown gkbrown at gwi.net
Sat Aug 27 14:01:25 EDT 2005


Just a wild a-- guess, but I thought that the Valiant used only 6146's, not
the "B" 6146. It is my understanding that sometimes subbing in the "'B" for
the early 6146 just doesn't cut the mustard.
Regards,
Gary...WZ1M
----- Original Message ----- 
From: "John Lawson" <jpl15 at panix.com>
To: <amradio at mailman.qth.net>
Sent: Saturday, August 27, 2005 1:56 PM
Subject: [AMRadio] A bit of Viking Valiant help


>
>   I'm in the middle of a long, slow project to get my Valiant back in
> service. I've changed out the bigger power tubes, solid-state replacements
> for the 866s, and partially re-capped the rig, specifically the RF power
> section.
>
>    After finding (expensively) out that 'W' 6146s just don't work, I
> replaced the finals with new 'B's and power is now being transferred to
> the antenna / dummy load.
>
>
>    Main bug:
>
>    On the bands below 20M, however, and getting 'worse' as the frequency
> gets lower, the rig "runs away" after 15 - 30 seconds - the plate current
> rises fatser and faster and then needs to be shut down, lest another set
> of 6146s gets wasted.  ;}
>
>    I have neutralized the transmitter per the manual, seems ok. Bias also
> set per sepc. LV rectifier tubes have been chacked (on a Weston 686) and
> seem within spec, though their performance under load is measurable only
> in situ.
>
>    I left the doorknob cap alone because it's fine electrically and not
> cracked or discolored.
>
>    Do the sypmtoms sound familiar to anyone? Before I spend a bunch more
> hours wearing out the transmit switch, I thought I'd ask those who have a
> lot more experience than I do with the Valiant.
>
>    I can add more info/observations as needed, specific caps replaced,
etc.
>
>
> Thanks all!
>
> Cheers
>
> John  KB6SCO
> ______________________________________________________________
> AMRadio mailing list
> Home: http://mailman.qth.net/mailman/listinfo/amradio
> Help: http://mailman.qth.net/mmfaq.html
> Post: mailto:AMRadio at mailman.qth.net
>
>





More information about the AMRadio mailing list

This page last updated 16 Dec 2017.