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Reviews Categories | Amplifiers: RF Power - HF & HF+6M | Alpha 374 Help


Reviews Summary for Alpha 374
Alpha 374 Reviews: 13 Average rating: 4.5/5 MSRP: $alpha 374 manual
Description: ALPHA Legacy Amp w. 2 x 8874's
Product is not in production.
More info: http://www.rfconcepts.com
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KG4LRU Rating: 4/5 Sep 18, 2005 17:40 Send this review to a friend
ROCK SOLID  Time owned: more than 12 months
I pick up my 374 about a year ago it was a one owner, And it had sticky paint problem which was quickly removed and resprayed silver like the rest of the cabinet, I have had several older amps this one makes great power I find very easy to tune up the band pass tunning works well and quickly unless you want to go over a Kilowatt of power it uses 8874 Tubes mine our the original tubes and will put out 1500 watts , I wouldnt recomend it as to SOP . But its there if you should need a little edge, well built even by todays standards. The amp is a work horse and will perform on 10-80 Uses Three Tubes . Very compact in size and very clean signal. The bad points relay CLACK Clack and Clack it does make a bit more noise also it suffers from a noisy fan for cooling it uses a muffin fan that presurizes the final compartment its the reason you shouldnt push it over the rated 1300 watts . the fan system would be very difficult to re engineer on the 374 due the lack of space . Also be sure the tubes our in good order, retubing this will cost more than the amps worth , If you find a nice one that has been taken care it will get job done. Tubes our very durable and our not prone to being damaged the amp does have some very good protection features that werent found on amps be offered back in 1974 .
 
WK4B Rating: 4/5 Nov 4, 2000 11:35 Send this review to a friend
Oldie but Goody  Time owned: more than 12 months
I bought this amp from the original owner (now a silent key). Serial number 7232, It originally only had two tubes (8874). I had amp modified for warc bands and added third tube, now full power on all bands with 90 watts drive. This is a great old amp built like a Mack truck. Put new front panel on amp now it looks like it just came from factory.
 
K2UA Rating: 3/5 Mar 1, 2000 11:36 Send this review to a friend
Good 80-10 performer; weak in some areas  Time owned: unknown months
I own a very early 374, made in 1973 or so. It made good power when it was in service. Covers 80-10 meters, has a Hypersil transformer, and is in a small, desktop case. Tuning and loading adjustments were done with small knobs directly driving their respective capacitors; larger knobs would have been helpful. The bandpass tuning worked pretty well, although it was a horror to adjust if you wanted to move it to a different part of the band. Cooling was poor. A mid-chassis-mounted, high-grade muffin fan sucked air in over the PS and past the output network, where it had to make a right-angle turn through the tubes, another right-angle turn at the tube air outlets into a (roughly) 1.5-inch-square plenum, and out the back of the amplifier through a small piece of screen. The amp worked well much of the time, but developed problems (high second-harmonic content on 80, which cleared up when I replaced the toroidal 80-meter inductor in the output network). A magnificent parasitic oscillation also whacked all three tubes and blew the contacts off the selected band on two sections of the four-section bandswitch, resulting in a large parts bill and a small investment in an AG6K parasitic-suppressor kit that calmed the amplifier down completely. Later UPS dropped the amplifier during shipment and really hosed the chassis, meter and meter switch. I found that the special six-button meter selector switch and the meter movement were made of unobtainium, so the amplifier now sits in a corner of my basement, unceremoniously holding down a section of the floor. In its day this was a fine piece of gear, but today I'd pass on an original 374 in favor of almost anything with two 3CX800s or one 8877 and good cooling.
 
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