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Reviews Categories | Amplifiers: RF Power - HF & HF+6M | Henry 4K ULTRA Help

Reviews Summary for Henry 4K ULTRA
Henry 4K ULTRA Reviews: 4 Average rating: 5.0/5 MSRP: $8000.00
Description: HF Linear Amplifier - Heavy Duty
Product is not in production.
More info: http://
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KC5TJT Rating: 5/5 Aug 7, 2008 06:27 Send this review to a friend
HENRY.. ENOUGH SAID!  Time owned: 0 to 3 months
Picked this amp up a few months back.. I find myself running it more and more. Over the 8K Ultra and the 77Sx I own. Tunes EASY.. Will do 3KW EASY and really a all around amp. It has many features the 8K doesnt have like the Staged Voltage start. Acts like a manual SOFT START. The metering setup is fantastic. The noise is not bad.. The 8877 is a rugged tube and will last forever on LOW Power with 40 watts input and 1500 watts output. JUST BUILT LIKE A TANK!! BUILT TO LAST A LIFETIME and this is a KEEPER FOR ME!!
AI0S Rating: 5/5 Feb 8, 2007 19:18 Send this review to a friend
Ultimate amp  Time owned: more than 12 months
This is an amp for those of us who appreciate a _real_ piece of equipment as opposed to current consumer LED-bedecked and overpriced offerings from companies some of which names might possibly begin with an "A". It's a bit like comparing a Chrysler 440 Hemi to a Lexus.
Totally legal in low power setting of course, which for this particualr amp is an always sufficient 1500 to 1800 watts PEP...
No, you don't want to jack it up to hign 'cause that'll do an easy 2500 to 3000 watts output....
PS. Needs a good (probably dedicated), 240 VAC thirty amp circuit.
PPS. Only exceeded by the 8K Ultra (tubes with handles), for those "in the know".
1/QRP. Huuummmmmmmmmgrrrrr. The sound of power.....
KQ6FU Rating: 5/5 May 12, 2003 18:39 Send this review to a friend
A beast....  Time owned: 6 to 12 months
I bought this amp 2nd hand and it was very well cared for. Aside from all the technical babble that you can read on the Henry site, this amp is great. It's easy to use, tunes up quickly and takes very little to get it to the nominal 1600w on the LOW setting.
The high setting as yielded 3.04kw (in to a dummy load of course) with relative ease.
If you can find one, get it or you'll regret it. Mark KQ6HW had the chance and passed it up, now he regrets it every time I tune up!
W0DC Rating: 5/5 Feb 10, 2002 19:14 Send this review to a friend
A Great Amplifier!  Time owned: more than 12 months
The 4K ULTRA uses a 8877 (3CX1500) Eimac triode in grounded grid service to deliver a factory rated 2000 continuous (RTTY) watts output (2500 for SSB). Covers 3 - 30 MHz continuous. Heavy duty power supply uses step-start circuitry and oil capacitors. The RF tank circuit is a thing of beauty with robust components including vaccuum load and tune capacitors and a vacuum TR relay. Three panel meters monitor high voltage, plate current, grid current, power (Bird meter w/ forward & reverse), and filament voltage. Barely gets warm at amateur power limits!

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