It sounds like the tubes are fine and the bias is zero volts.
RF Parts brand and Taylor are the same tubes, they changed the name due to
bad publicity about the quality. Kicked the Chinese butts for better quality
which is still sometimes missing.
Id buy my tubes from Ameritron, they are all tested at voltage, still the
same end source.
Im brave and get them direct from China, no problems yet but Ive been
dealing with Greenstone since the 80's.
Carl
KM1H
----- Original Message -----
From: "Gary Smith" <wa6fgi@sbcglobal.net>
To: <amps@contesting.com>
Sent: Wednesday, June 09, 2010 7:35 PM
Subject: [Amps] Centurion plate current issue
> Hi to the group:
>
> Finally got around to taking off the cover (excess of twenty screws)
> removed both tubes from sockets and switched the amp on. No plate current
> draw. Good. Was suggested by TenTec to insert tubes one at a time and
> check plate current.
>
> Did that, plate current draw with either tube in place is 175 ma or so.
>
> Is there any way to check (with ohmmeter) for internal shorts? Which pin
> to what particular pin?
>
> I `spose anything is possible but both tubes going bad at same time?
>
> When checking the tubes, had the HV on for maybe no more than 30 seconds
> or so, aluminum heat dissipaters on the tube(s) was extremely hot to the
> touch.
>
> Fwiw, tubes are RF products house brand. If I need new ones, any
> difference form RF house and Taylor's?
>
> looking of some ideas on this one (some more),
>
> 73, Gary...wa6fgi
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