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Reviews Categories | Amplifiers: RF Power - 6M/VHF/UHF+ | Naigai Nag-144xl Help

Reviews Summary for Naigai Nag-144xl
Naigai Nag-144xl Reviews: 4 Average rating: 4.0/5 MSRP: $(missing—add MSRP)
Description: 144Mhz Valve Amplifier - 250Watts
Product is in production.
More info: http://
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EA4AZZ Rating: 5/5 Aug 28, 2008 06:31 Send this review to a friend
excelent amp  Time owned: more than 12 months
This small baby is one of the best 2m amps that I ever had.
With 25 wats input power and 250-280 mA at 235 volt the out power is 400w pep in a bird watt meter.
The 4cx350f run in this amp at 1850v with 235 volts in power line.
Can the 4cx350f give mor than 400w??? Yes but not in this amp at 1850 volt of plate voltage, Is a nice protection because the tube with 2250v in other amps can give 600w...but no too long.
The tube run forever at 1850 in this amp.
Also have a monitoring temperatube over the tube with a sensor and over current protection.
I work with this amp in ssb, cw, contest and also EME.
Is small very quiet and also have a nice preamp inside the box.
Yes under my point of view the blower is small but have a great job.
If you run at 400w ssb the blower is ok.
G0FVT Rating: 2/5 Jun 18, 2005 10:54 Send this review to a friend
Too Hot!  Time owned: 0 to 3 months
I was interested in playing with this to see how it compared with my own CCS1 amplifier, must admit I found it disappointing. Overheats and trips itself out on SSB at full output, the HT voltage offload is not really enough to do the 4CX350 justice and under load it sags quite a bit.
I added a tertiary winding to the transformer to enable it to run with a 4CX350B, this is helpful as they are more readily available than the 4CX350F. On balance it is a small handy amplifier and performs adequately if you treat it gently, probably good value if compared to alternative ways to run the same power on VHF.
LA1AL Rating: 4/5 Jan 20, 2005 12:07 Send this review to a friend
Time owned: 6 to 12 months
Purchased a second hand NAG144XL with a orginal
4CX350F tube that seem to work just fine with
275W output CW/SSB.
The cooling is not adequate for FM use at full power so it's good policy to reduce the drive in FM mode.
You can buy the 4CX350F tube from USA if needed,
(Antique Electronic Supply ETC)
Good amp!
M1EQN Rating: 5/5 Dec 29, 2003 20:25 Send this review to a friend
Excellent Amp - Review by M1EQN  Time owned: 0 to 3 months
The NAIGAI NAG-144XL will deliver aprox' 250 Watts with about 12 Watts input.It even puts out an amazing 95 Watts with a mere 500mw very happy with this amp as it is also a good match for my KENWOOD TS700 which i use the amp with.The amp itself has a 4CX350F valve which i believe are hard to get but if your lucky to find one expect to pay around 90 for one.If any one knows of any spare 4CX350F valves going spare please email me at

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