[Amps] transformers

[Joe Isabella]

I can get nearly 2.5kW PEP output measured on the VFD (predecessor to the WX0B PowerMaster) out of my Henry 3K-A with a pair of 3-500ZGs and almost 4kV on the anodes with 150W+ drive.  Do I do that?  No, but it's possible with enough "umph"...
 
Sorry I asked about the "2kW..." marking on the '220...  
 
 :-P

Joe, N3JI

----- Original Message ----
From: Gudguyham at aol.com
To: cherokeehillfarm at earthlink.net; w8ji at w8ji.com
Cc: amps at contesting.com
Sent: Monday, July 17, 2006 9:21:14 AM
Subject: Re: [Amps] transformers


In a message dated 7/17/2006 8:46:54 A.M. Eastern Standard Time,  
cherokeehillfarm at earthlink.net writes:

The  above data is from the AL 80B.  I wonder how they manage to measure 
their  RF power output at 1 KW.  There are others that seem to rate the output  
from the modern tube much the same way.  I never questioned my results  because 
they were more or less identical to the above data.  Interesting  to note the 
10 second warm up time for this instant heating tube.  I'll  be these guys 
have some spec sheets that I can't seem to obtain.

73 and  Happy DXing,

Mike

W2AJI



Mike, Assuming in all cases only 100 watts is available for driving power,  
one could drive an AL-80 to a KW output, but with the same 100 watts with an  
SB-220 you will only see a max. of about 1300 watts.  Now on the other  hand, 
if more power for driving was available >100 watts the Sb-220 will  continue to 
make power.  No doubt the Sb-220 could get 1500 watts, but not  with only 100 
watts drive.  Also, I have had MANY Eimac tubes and Chinese  in my dozens of 
Sb-220 I've owned and in some cases the Chinese tubes did better  than Eimacs. 
I also discovered that there is SOME truth to a "matched set"  of tubes.  I 
encountered one extreme instance that really blew me  away.  I once mated a 
pair of 3-500's in an SB-220, the power was way down,  I substituted another 
tube for one tube and the power went right up to snuff, so  I thought I had one 
bad tube and was lucky enough to pick it out the first time,  Just for the heck 
of it I put the other tube back in the amp (that I thought was  not too good) 
with the substituted tube and the power was right up to  snuff.  The 
combination of the 2 tubes was just not right.  I  concluded at that point that there 
really was some validity to the "matched set"  of tubes.  Most likely in 99% 
of the cases, you can mate any 2 tubes and  get full power output, but there 
just may be that 1% chance that 2 tubes wont  work together.  I think I 
encountered that 1% chance one time.   Lou
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