[Boatanchors] TUBE TEST

[Carl]

Hickoks are known to do that when overheated.

Create a dynamic test bed with properly sized components.

Carl
KM1H


----- Original Message ----- 
From: "Magoo" <magoo at isp.ca>
To: <boatanchors at mailman.qth.net>
Sent: Wednesday, July 01, 2009 6:54 PM
Subject: [Boatanchors] TUBE TEST


>I just did some tests on a bunch 14) of NOS Russian 6550 tubes looking for 
>a
> pair for my modded Ranger.  On my Hickok 605, every tube showed very good,
> in most cases exceeding the basic minimum for that tube.  HOWEVER, every
> tube tested did the same thing: the reading reached a peak and then began 
> to
> slide back down, often below acceptable minimum.  Bad sign...I used to see
> 6146 tubes and similar from FM radios with the same characteristic and
> consequent low power output.
>
> Has anyone else had this same issue?  I know the tubes are brand new and
> about 10+ years old.  Is this a characteristic of the older Russian tubes 
> on
> the whole?  How about the new tubes?  I'd hate to order a new pair today 
> and
> find they do the same thing!
>
> Bill, VE3NH
>
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