[Amps] Different versions of 3-500 tubes in amp

[Mark - N5OT]

Hi Warren,

I have had the same problem.  My Henry had two Eimac-looking type 3-500s 
in it, but one stopped working (that was spectacular all by itself, 
actually).  So I purchased a new 3-500ZG to get out of a bind, because 
it was all that was available to actually get the radio back on the air 
for the contest with two days' notice.

Although the ZG and the Eimac-looking one worked fine together, I 
realized that my sense of world order was completely thrown off by 
having two tubes that didn't look the same, and one of them didn't glow 
like the other.  I would wake up in the morning lethargic, and wondering 
"What is the point?" etc, stuff like that.  Probably also had a stuffy 
nose.  So after the contest I went on the prowl to find a pair of proper 
Eimac tubes, found them, and now all is right with the world and I have 
a spare ZG with very low hours that I hope to sell to some ham who 
doesn't care as much about that sort of thing as I do.

My health has generally improved since changing over to Eimac tubes, but 
I am not sure the two events are related.

Mark N5OT


On 1/22/2019 7:54 PM, Warren Volz wrote:
> All,
>
> I've decided one of the two tubes in my SB-220 is weak and I'd like to
> get a replacement. Right now both are original Eimac tubes with the
> non-graphite anode but I see most replacements are graphite. Will there
> be any issue running tubes with different anodes in this amp?
>
> -Warren KD5YPH
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