SB-200 users: a question.

[Kenneth G. Gordon]

On 19 Apr 2010 at 8:24, Bob, W5UQ wrote:

> So I buy new ones now

WHERE do you buy new ones? What brand? How much 
for each? 

As far as I know, there have been no really GOOD new 
572Bs made in the past 20 years or more. 

ALL Cetrons are at least that old by now.

None of my Cetrons were anywhere near new, even the 
best outputing less than 200 watts when tested. 

Taylors are made in China. Even those supposedly tested 
by RF Parts have QC issues.

Shuguangs have VERY poor QC, fully 75% failing within a 
short time after purchase. 

One of a set of 4 Shuguangs I purchased not too long ago 
failed immediately with some sort of grid problem. It 
"sizzles" when the power is brought up and draws several 
hundred mA of grid current.

Svetlana's are only good for SOME audio amps, and 
haven't been made in several years. You CAN use 
Svetlana's in an SB-200 as long as you neutralize the 
circuit....which isn't trivial. Otherwise they run away.

I am not sure where Penta's are made, but their QC is also 
abysmal.

So, I repeat the questions: where, how much, and what 
brand?

Ken Gordon W7EKB

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