[Amps] sb220

Paul M Dunphy amplifier at ve1dx.net
Sun Apr 29 12:38:52 EDT 2007


At 11:40 AM 29/04/2007, you wrote:

>Hello.i am a SB220 owner.i just got it to work.clean it upp and all. 
>after 4 years.but somthing is wrong i get 550 W output?... and when 
>i try the 3-500z each in single use i get 550w out on a single tube 
>?.and when i install then both i still get 550w..someone?
>
>best regards from sweden
>
>SM7TVJ

     Does this happen with both tubes (does it matter which one you 
use when you test it with a single tube?)  The obvious answer is that 
one tube is soft or completely dead, and the other one is good, but 
that is a very simple answer.  I suspect you have already eliminated 
that possibility and the problem is more complex.

73/DX Paul VE1DX 


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