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Author Topic: 8874..(3cx400a7) availablilty..for alpha 76ca amp.  (Read 2424 times)
KD5IR
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Posts: 11




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« on: November 23, 2003, 03:00:03 PM »

i've read the product reviews for this amp and all 5 rated this amp as a "5".  My only reservation about purchasing this amp is the availability and price for a set of tubes.  They are just atad bit pricey.  i would like some opinions on this issue and some actual experiences if available, thanks for your time , sanford kuteman ,kd5ir
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WB2WIK
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Posts: 20630




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« Reply #1 on: November 24, 2003, 02:34:03 PM »

If you get one with good working tubes, they'll last many years.

Some have been replacing 8874's with 3CX800A7's, which is physically larger so there's a bit of metal work involved, but the 800A7's are very available and one will do the work of two 8874's.  Some have also been replacing 8874's with Russian-made 4CX400A's, which are very inexpensive.

But the tubes can last an awfully long time if not abused.  We are just now changing a set of 8874's in an old Alpha 374 (which used three of them) that was built in the early 1970's and has been used in dozens of contests....

WB2WIK/6
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W8CAR
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Posts: 109


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« Reply #2 on: November 24, 2003, 10:49:28 PM »

I have a 76pa (3 holer) and recently replaced a set of tubes that have been in the amp since being built. The 'new' tubes are pulls from older MRI equipment. 8874s are expensive new but are available used and as pulls. My new tubes give about 300 more watts out than the old ones (the old ones put out 1500 with 100 watts drive). I have used my amp extensively since I purchased it in 1994 used from it's first owner. If the tubes in the amp you buy are good you won't have to worry for years and years which will give you time to shop for some good pulls. BTW-I have no interest in selling my amp-it's perfect cosmetically and electrically and it works great. Good luck with your purchase.
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W9GB
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Posts: 2648




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« Reply #3 on: March 13, 2004, 01:02:34 PM »

Sanford -

The 8874 is readily available - and still used in medical equipment (MRI) and commerical broadcast equipment.  The medical surplus market should be a good used source.  Tubes virtulaly last forever in amatuer service - IF amplifier is used correctly (NOT ABUSED).

w9gb
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