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Reviews For: Alpha 77Dx

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

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Review Summary For : Alpha 77Dx
Reviews: 16MSRP: 4500
Description:
Single 8877; QSK; 160-10 including the new bands
Product is not in production
More Info: http://www.rkrdesignsllc.com
# last 180 days Avg. Rating last 180 days Total reviews Avg. overall rating
00164.7
W6IML Rating: 2005-08-18
overated, overpriced Time Owned: 0 to 3 months.
Alpha has made some great amps, but this isn't one of them. It is overpriced, and underbuilt. The DX is a fair amp, but for a desk top amp it is to big, and takes to long to tune. The SX model [dual 8877's] has a wimpy power supply, and will not feed those 8877's with the plate current they require, nor the voltage regulation. The smaller Alpha amps will give you the gain you are looking for, and are simple to tune, especially the bandpass tuning amps like the 78, the 374, and the 374A. Those amps only require you to change bands, and go for it!
Save your money and find a Alpha 78, or one of the 374's that come available very often. They are less than half what a 77DX/SX will cost you, and will give you almost the same gain.
WV4R Rating: 2004-05-11
Big Heavy Amp... Big Heavy POWER! Time Owned: more than 12 months.
This unit was purchased NEW around 1976 and has been kicking around a number of QTHs over it's TWENTY EIGHT years of occasional usage. The unit has always been very Quiet for it's Huge Size and Huge Power. It needs it's own reinforced Space for sure as it takes two men and a donkey to move it! Sad to say it does Look a bit like it has been kicked around for almost thirty years but that is superficial cosmetics and to be expected. You have to glance at the meters to be sure it is working because there is no hum and no buzz just quiet POWER... and it is still putting out Full Power on the Original Factory Tube... 'nuf said for this ole boat anchor to receive the wv4r FIVE-Star rating. 73 es God bless, murf/wv4r.
KG5FTK Rating: 2003-02-01
excellent but pricey Time Owned: more than 12 months.
I owned the dual 8877 version for a few years and it was a very nice amp. However, the potential long term cost of owning this amp was scarey. Two 8877's cost more than the first car I bought and like every other amp ever built, the ps was not nearly as capable as it should have been with tubes capable of 5kw peak in. I have heard more than a few owners of these amps buying bigger replacement power transformers for their amps that cost more than $500. I don't think I would buy another; I think I would go for a well cooled 3-500z or surplus 4cx800a amp.
PA1KW Rating: 2003-02-01
good better BEST Time Owned: 6 to 12 months.
I have an Alpha 77Dx since july 2002.
I am using it besides the 87A.
It is a great and very well build linear, and the components are very oversized.
It is giving a lot of power, and easy to tune.
Never had any problem with it, and i think this unit is become an collectors item soon.
If you can get one buy it, posible the best manual tuned amp there is.

PA1KW Bert
SM4MI Rating: 2002-07-11
5/5 Time Owned: more than 12 months.
Alpha 77Dx is the best tube amplifier I ever have used. Have been used during 15 years with same tube. Still running with full power output. I hope it will run for additional 15 years.
RobertKoernerExAE7G Rating: 2001-05-04
Solid performance, 15 years Time Owned: more than 12 months.
Finally had a problem with mine -- had to replace the tube; haven't bothered to replace the light bulbs that have burnt out though. The original 8877 outlasted my wife by 11 years.