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Henry 2K-4 Power Supply Upgrade and Filament Fix




 
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Author Topic: Henry 2K-4 Power Supply Upgrade and Filament Fix  (Read 7413 times)
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AC0OB - A Place where Thermionic Emitters Rule!
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« on: September 02, 2014, 01:40:44 AM »

Many people use Henry amplifiers on AM to bump up the power from their Vintage tube exciters.

In the PDF file below is an upgrade to the Henry 2K-4 Power Supply and a fix for a filament supply problem that you may encounter in the future.  Smiley

Phil - AC0OB




* Henry 2K-4 PS Mods.pdf (737.35 KB - downloaded 68 times.)
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Patrick J. / KD5OEI
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« Reply #1 on: September 02, 2014, 07:25:06 PM »

That's pretty cool. What was the B+ before? was it an increase? I prefer an LC filter usually for regulation, what is the advantage of changing?
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DMOD
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« Reply #2 on: September 02, 2014, 08:52:13 PM »

Thanks Pat.

Prior plate voltage with the old LC filter was about 3150V standby and 2750 loaded, measurements taken on 40 meters.

Advantages are:

1. Better voltage regulation, 200 volt drop standby to load instead of a approx. 500 volt drop,  

2. Less cabinet heat generated from bleeder system and filter choke, bleeder power reduced to 28 Watts from 216 watts.

And I would say the "soft start" circuit is a requirement for any power supply using only capacitor filtering.

AC0OB
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