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Reviews For: Amplifier ZZ750

Category: Amplifiers: RF Power - HF & HF+6M

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Review Summary For : Amplifier ZZ750
Reviews: 7MSRP: 700
Description:
Easy and powerful contracted amplifier with 1000Watt pep
Used GU74B (4CX800), Used in several DXpedition from DL7DF,DL7IO,DL3BXX,DK7YY,9G5OO,etc.

Nice Amplifier, Nice Price
Product is in production
More Info: http://www.qsl.net/uy5zz/PAs.htm
# last 180 days Avg. Rating last 180 days Total reviews Avg. overall rating
0073.9
DL1HVO Rating: 2021-06-05
Quality goes down Time Owned: more than 12 months.
OK, if it works. Many probs with the quality.
ON4CHG Rating: 2019-10-17
Nice machine! Time Owned: 3 to 6 months.
Bought this amp at Friedrichshafen this year. I must say Vladimir is 100% about making agreements on the phone. Arriving back home and installed the ZZ-750 a few weeks later. Works completely like it is supposed to do. The fans are a bit loud but I replaced them with a pair of Papst fans (low dB)ordered from the internet. This was an extra cost of €120 but certainly worth it. The machine runs much more silent now. I also replaced the knobs to give it a more modern look. As noted in the specs the amp can have an input of about 30 watts to produce full output power.
Here are my measurements:
Freq P.in P.out
1.8 30 800
3.5 30 850
7 30 900
10 30 900
14 30 900
18 25 850
21 25 800
24 25 800
28 25 750

Not bad for a machine that costs a quarter of another amp.
Just this week there is a slight "buzzzzzz" coming from the transformer which vanishes when the amp is at operating temperature. This is the only reason why I rate the amp a 4 instead of a 5. It is only a slight buzz which lasts for a couple of minutes and I am sure I can fix this too.
My opinion: You want an amp that is ready to compete with most modern amps for a quarter of the price? And you don't mind having to turn the knobs for tuning or changing band?
This is the machine to buy.
Well done Mr. Vladimir. I have recommended your amps to the members of my club and there was allready an order placed for the ZZ-1600.
DM2LI Rating: 2016-10-22
just perfect Time Owned: more than 12 months.
got that ZZ-750 for 3 years by now , with daily operation , it is a real workinghorse without any problems , solid quality , couldn`t be better and moreover you get that quality for a very reasonable price as well ,the GU 47 b is almost unbreakable !
it replaced my 811 from Ameritron which gave me only problems with the 811 tubes as they never lasted long !

using the ZZ-750 now , no need to replace the tube any longer
buying the ZZ-750 was a good investment !

vy 73 de DM2LI
EA4SV Rating: 2013-04-11
Worst buy ever Time Owned: 0 to 3 months.
It came with one fuse holder and a pin of DC connector both broken. mA needle went full scale and tube becomes to heat, a DC problem from power supply that broke the tube. The HF relay broke in a week. Power supply refurbished from another device and lots of component are not new.
F5CVI Rating: 2010-09-13
Amplifier ZZ750+50mhz Time Owned: 0 to 3 months.
Good amplifier with all hf bands and 50MHz now on its latest version.
the knobs may be a little bit old school. but performance is very good 800 to 900 watts. for less than 700 euros vlad you provide a superb machine with a tube GU74B (4CX800A) tube used in many amplifiers hf as acom 1000 eltron ed1 but dividing the price by three. thank's vlad good job!
SV2DXA Rating: 2008-10-12
Best buy. EXCELLENT service Time Owned: 0 to 3 months.
If you can't buy Acom or athother expensive commercial amplifier ( with GU74B )the ZZ-750 is your solution.
About service : Mr Vladimir standing by you.
Good quality , after sale service.
DL5VZ Rating: 2008-06-18
solid handmade PA Time Owned: 0 to 3 months.
very solid handmade amplifier,
cooling-fan is a bit to loud inside the shack,
best you can get for this price,
750 Watts ++ ( mine runing 1200W) on 10 bands, 5omc included.
good job done by Vladimir,UY5ZZ