[AMPS] Advice on Henry 5K (2 x 3cx1200a7)

[Rich Measures]

.......
>Pending inspection a friend of mine will be purchasing a Henry 5K Classic
>Console and would like to know what he should be aware of, or look for, with
>this amp?
>
>What should it be capable of producing at 4.4kV (has 5.7kV tap as well), and
>what should the grid current be at various input and output levels.
>
Each tube is capable of producing about 2kW with roughly 80w of drive.  
There is no grid current rating.  Tune for max. out with max. drive and 
the grid current will be okay.  
-  The 3cx1200a7 has much feedback C, so don't expect the amplifier to 
exhibit good VHF stability.  If you experience arcing at the C1 
bandswitch wafer, it might be a good idea to reduce the VHF-Rp of the 
stock suppressors. 
-   The 3cx1200 A7 has been superceeded by the 3cx1200 Z7, which has 1/10 
as much feedback C.  
Rich...

R. L. Measures, 805-386-3734, AG6K   


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