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write your own review of the Alpha 91B.
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K7FL
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Rating: 5/5
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Jan 18, 2012 10:43
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Great amp
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Time owned: more than 12 months
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I bought my 91b new about 10 years ago. I've used it frequently over the years, primarily contesting or low band DXing. I did return the amp to the factory last year for some upgrades which were accomplished quickly and efficently. Lovely amp.
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PY2ADR
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Rating: 5/5
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Nov 2, 2011 14:45
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Simply Fantastic
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Time owned: 0 to 3 months
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I called Molly asking if she had a good old one cause i was going to USA and was dreaming with an Alpha. She told me about a 91b that was never being used by a costumer etc etc. That's what i was looking for !!! Conclusion: i love my transistorized one but Alpha is a workhorse and will seat on my shack forever. Silent, easy and powerful (reach the red leds easy and smooth).
completely satisfied.
73's
PY2ADR / ZY2C
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W2LO
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Rating: 5/5
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May 20, 2011 18:27
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Great Amp!
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Time owned: more than 12 months
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I bought mine new in 1997 and used it more less continuously until 2009 when I added an Alpha 8410. I still have the 91b and use it along with the 8410. The 91b never missed a single beat, turning out QRO in contact after contact. I replaced the two relays about 5 years ago and did a few changes suggested by Alpha but it is a reliable performer, easy to use, never working hard to produce lots of RF. I wish that the consumer junk I buy were a quarter as good.
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N9PYS
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Rating: 5/5
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Mar 14, 2011 20:03
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Pure Alpha!
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Time owned: 0 to 3 months
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I have a 76a and thought I would never get another amp, but, I came across a pristine 91b about 2 weeks ago. I must say that I am very impressed with this amp. External muffin fan included in the deal. This amp is a brute and just coasts at legal limit. Into a dummy load I am seeing about 2.3kw with 60w drive. With 40w drive it cruises at 1.5kw without breaking a sweat. After having fun with rebuilding the Heathkit SB-220 and a Ameritron AL 80A which both are also good amps, I decided to jump to the Rolls Royce of Amplifiers and glad I did. I hope Alpha sticks around forever, it has been a pleasure to finally own 2 of these fine quality amps. My rating is a 4.5 on both amps only due to the tubes being replaced, but, they have been around for years and hopefully will be around for years to come. Thanks for reading my take on the 91b, even though it was assembled in europe, it is still an Alpha!
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W6XI
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Rating: 4/5
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Feb 15, 2011 20:31
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Good amp until it failed
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Time owned: more than 12 months
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I bought my 91B in 97 and it ran great for 13 years and then it faulted out. Sent it to Alpha and three months later I got it back. It had several modifications(upgrades per Alpha) which made it a very different operating amplifier and a big price, that I had no choice in whether I wanted it "upgraded or not". Just pay the bill. In most states that is illegal without the owners approval. It lasted 1.5 hours and faulted again. I sent it back to Alpha and two or three weeks more and I had it back. I never opened the box and sold it off. I,m done with Alpha.
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ON9CC
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Rating: 5/5
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Feb 1, 2011 05:44
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Excellent!
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Time owned: more than 12 months
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I've bought my 91b about a year ago second hand from Bert PA1K. Since then I've only used it on 160m and 80m with great pleasure. It's quiet, produces a clean signal and is a pleasure to tune. If you're looking for an HF amp and can get your hands on one, don't hesitate; I would also buy it again.
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W5HOW
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Rating: 5/5
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Jan 30, 2011 09:07
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The Best
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Time owned: months
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I have never used any other amplifier and it looks as though I never will!
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LA4UOA
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Rating: 5/5
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Dec 17, 2010 12:12
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top amp/top service
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Time owned: 3 to 6 months
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Bouhgt my amp second hand,when i got it i had to do some mods,e-mailed Alpha and they answered me same day,with a list of mods with pictures ,so mods was very easy to do,Thank you very much Glenn.
Amp has plenty of power,with low drive,very easy to tune up,and runs all day long and never overheating.Have the extra fan but never used it.
I love mine.
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EA1DR
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Rating: 5/5
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Dec 17, 2010 06:51
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Simply; FANTASTIC..!!
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Time owned: more than 12 months
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I can only say that they are fantastic.
I had the opportunity to try a 91B in the W0LSD QTH, my friend Ken, and I can only say it was a great experience. It is quiet, its superb valve, and easy operation ..
Simply fantastic ..! I can recommend this linear to everybody.
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N3AF
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Rating: 5/5
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Dec 11, 2010 05:22
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Excellent (!!)
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Time owned: more than 12 months
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I purchased my Alpha 91B in December 1997. After 13 years of solid performance, I thought I'd add my endorsement and high fives for this super amplifier. I've had zero problems. Still using original tubes with full output! No issues whatsoever.
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