[Amps] Matched Pairs of Tubes

[Sam Carpenter]

I withdraw my observation due to lack of attention to detail on my part. You are of course correct. 

 

From: N7KA at comcast.net [mailto:N7KA at comcast.net] 
Sent: Friday, November 19, 2010 10:34 AM
To: Sam Carpenter
Subject: Re: [Amps] Matched Pairs of Tubes

 

A 4-250A is an internal anode glass envelope tube.

A 4CX250(B) is an external ceramic/metal tube.

 

A BIG DIFFERENCE there.  PLEASE Study the data sheets for both tubes.



Arne N7KA

----- "Sam Carpenter" <sam at owenscommunication.com> wrote: 

I have always read that on these tubes it is good to get pairs of the same
age, brand, and usage together and you were fine. I understand that they
were/are built to pretty tight tolerance. I keep looking at the new ACOM
1011 that uses only 2 of them. Da*&, I wish it were 4. There is something
sweet about that tube and they will obtainable after all else is gone. At
VHF, I have abused the snot out of them for long periods of time and they
stood up. Nice that I could get free pulls too.
Sam, N9FuT