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From: Chuck on 27 Jul 2010 13:27
On Mon, 26 Jul 2010 08:19:04 -0700 (PDT), Jim Adney
<jadney(a)vwtype3.org> wrote:

>On Jul 21, 11:22�pm, Jim Adney <jad...(a)vwtype3.org> wrote:
>
>> Finally, I checked the DC bias on the HOT. The Zenith manual says it
>> should be -80 V, so I was expecting it to be lower. It's actually -65
>> V. So there must be something else wrong in that circuit.
>
>In comparing my Sams & Zenith manuals, I find that Zenith says the HOT
>control grid bias should be -80 V but Sams says -48 V. I now have -65
>V. I'm going to guess that Sams is right and I need something closer
>to -50 V, which should turn things up a bit more and get me to the 26
>kV that I should have for the HV. I also checked the tube data sheets
>for the 20LF6 and 26LF6 and found that typical control grid bias
>values are -10 and -20 V. So I can afford to boost that voltage quite
>a bit higher (more positive) than the -65 V where it's at now.
>
>The set is put back together now, but I'll pull it apart again once
>our houseguests (arriving tomorrow) are gone. In the meantime, it
>looks like I should try to buy one of those odd 63-5440s. AFAIK that's
>the one remaining part in there that might be the problem, but I'll
>check around the circuit, too, to make sure I haven't missed
>something.
>
>As an aside: Was it common for the Sams to be more accurate than the
>Zenith manual? Or, to put it differently: Did the Zenith manuals have
>a poor reputation?
>
>thanks,
If I remember correctly, there were usually more mistakes in the Sams
manuals. Chuck
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