[R-390] RE (r-390) 26Z5 failure

[Steve Hobensack]

It is possible to loose one 26z5 at an earlier time and the radio operate 
normally. Each tube has two cathodes and two plates (four plates and four 
cathodes total). Both high tension leads from the power transformer are 
shared by each tube. If one tube goes dead, there is still full wave 
rectification.
...73..Steve...N8YE

>Message: 5
>Date: Sat, 19 Feb 2005 17:50:48 -0500
>From: "COL George D. Eveland, USA" <george-eveland at us.army.mil>
>Subject: Re: [R-390] 26Z5W Failure
>To: "Gene Dathe" <dathegene at hotmail.com>, <r-390 at mailman.qth.net>
>Message-ID: <000701c516d5$76e76b10$6401a8c0 at karennr5vnzpg6>
>Content-Type: text/plain; format=flowed; charset="iso-8859-1";
>	reply-type=response
>
>Gene:  I've had same experience here--lost both filaments at same 
>time....so
>now keep a couple of spare sets.
>
>73's
>Geo
>W8VG
>----- Original Message -----
>From: "Gene Dathe" <dathegene at hotmail.com>
>To: <r-390 at mailman.qth.net>
>Sent: Saturday, February 19, 2005 4:18 PM
>Subject: [R-390] 26Z5W Failure
>
>
> > Hi gang-- I leave my R-390A on 24-7-365.  Yesterday, I lost all output.  
>A
> > quick check revealed both 26Z5W tubes didn't light.  I replaced both 
>tubes
> > and was back in business, but I'm wondering if it is common for BOTH 
>tubes
> > to go out at once.  Your experience?  Sure, we can go silicon, but here
> > I'm interested in how the original design worked... BTW, I guess I need 
>a
> > pair of tung sols; those of you with 100 plus may want to part with 
>some?
> >
> > 73
> > Gene  NA0G
> >
> >
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