[Amps] Soft tubes

TexasRF at aol.com TexasRF at aol.com
Tue Apr 30 11:35:37 EDT 2013


2550w output with an L4B power supply is surprising. Makes one wonder if  
that is actual power being generated or perhaps a bad rf load that lets the  
power reading equal forward plus reflected power.
 
Maybe the other tube is not soft after all.
 
73,
Gerald K5GW
 
 
 
 
 
In a message dated 4/30/2013 7:58:09 A.M. Pacific Daylight Time,  
k8leewmm at aol.com writes:


Gentlemen

I took a nice HB amp in that uses a pair of  3cx1200a7,s.

along with the amp came 3     3cx1200d7,s

My question is what are the SOFT tubes worth?

The  pair of   A7,s will produce 1200w out,with a  drake L4hv  supply.

1 of the D7,s will show 1400 out the other 2 550w

All  the tubes work,they don't blow any thing up just SOFT!

your thoughts?

Wayne  k8lee
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