[Henry] My "new" 3K Premier

[Fern Rivard]

Hi John:

    I have a Henry 3K Classic Mark II Export version which uses the same tube as your amp (3CX1200A7). It looks like the multimeter full scale reading would be 1000 ma or 1 amp. The plate voltage in my amplifer is very close to 4 kv. Now here is what the manual says on my amp:

1) on ssb position, idling plate current 130ma with 0 grid current

2) on cw position, idling plate current 70 ma with 0 grid current

   They recommend loading the amplifier for 600 ma plate current with maximum of 250 ma grid current on the multimeter now this is for the Mark II Xport version while they recommend loading the amplifier for 600 ma plate current but with maximum 200 ma of grid current on the multimeter.
    Now keep in mind that the Classic Mark II Export version is really just loafing along at those specs. I hope that this is of some help to you.

    73 from Fern



----- Original Message ----- 
From: "John Becker" <johnb3030 at comcast.net>
To: <henry at mailman.qth.net>
Sent: Wednesday, October 17, 2007 10:55 AM
Subject: [Henry] My "new" 3K Premier


I recently bought a used 3K Premier. I have a few questions which I'm 
hoping someone here can answer for me.

What is the full scale range of the multimeter when measuring grid 
current? The manual says 100ma. on page 17, but on pages 27 and 29 it 
says normal grid current can be between 180ma. and 400ma. depending on 
the model and mode setting. Some of these numbers seem high since the 
3CX1200A7 data sheet suggests that typical grid current is around 250ma. 
How can I be sure not to exceed the 50W grid dissipation limit?

In checking the unit on the different bands, I find I am unable to get 
nearly as much power output on 12M as I can on 10M. At the same drive 
level, I get 1500W on 10M but only 1000W on 12M, and I have heard an 
occasional brief arc on 12M. This is into a dummy load and VSWR is 1.0. 
All other bands seem fine. Any suggestions?

My manual is missing the sheets with pages 65 and 66 and pages 71 and 
72. What is on these pages?

My amp has the step-start circuit, but it isn't covered in the manual. 
Were there ever any manual updates issued by Henry? Were there any other 
design changes I should know about?

Thanks and 73,

John, K9MM
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