[AMRadio] Negative Bias Supply on Viking II

Bernie Doran qedconsultants at embarqmail.com
Sat Mar 27 08:03:55 EDT 2010

Hi Arnie: be careful with the answers you get, if this is a simple full wave 
I would expect the plates to be tied together and only one cap.  I am not 
familer with Vikings, but hopefully you get an answer from someone that 
knows of what they speak. I have seen some strange circuits that made no 
sense till I carefully sketched them out, then its sort of "OH so that what 
it is"  Bernie----- Original Message ----- 
From: "Arnie Adelman" <arnie.adelman at infosec-consultant.com>
To: <amradio at mailman.qth.net>
Sent: Saturday, March 27, 2010 7:29 AM
Subject: [AMRadio] Negative Bias Supply on Viking II

> I've begun recapping the Viking II I'm working on.  The dual 15Uf/150V cap 
> connected to the 6AL5 has the positive sides of the cap going to the 6AL5 
> and choke and the negative side going to ground.  Since this guy is 
> intended to produce negative voltage and the connection is to the plates 
> of the 6AL5 rather than the cathodes, shouldn't the filter caps (I'm using 
> two 22Uf/450V) positive side be going to ground and the negative sides 
> going to the 6AL5 plates?
> I'm reasonably certain this is correct, but the original design used a 
> dual (two caps in one package with a common ground lead) cap and I've 
> never seen one where the common lead wasn't the negative sides of the 
> electrolytic cap.
> Thanks for your advice.
> arnie - W1GCI
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