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Reviews For: Amp Supply LA-1000-A

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

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Review Summary For : Amp Supply LA-1000-A
Reviews: 13MSRP: 499.50 in 1988
Description:
Compact HF linear amp.
Product is not in production
More Info: http://
# last 180 days Avg. Rating last 180 days Total reviews Avg. overall rating
00134.5
N8GPQ Rating: 2004-01-10
Needs Bias Cutout Time Owned: 0 to 3 months.
You may consider adding a bias cutoff circuit to these amps. This definitely a design flaw in this amp and other sweep tube amps I have worked on. Add a set of relay contacts somewhere and a resistor to the circuit and you are in business. Also metering protection with diodes and glitch resistor should be added. Just a few extra parts will make this amp more reliable and it tubes will last a long time.
W2TYO Rating: 2003-04-10
Potential problem Time Owned: more than 12 months.
I agree that the expensive sweep tubes don't last very long. However, the amp is small and easy to use. I had a problem with mine that someone else might experience. The output coil is wound on an insulating plastic coil form and the sections are terminated in solder lugs pop-rivited to the form. Unfortuneately, there are separate lugs for the end of one winding and the start of the next. Mine weren't soldered together--heated up and failed. I rewound the coil with jumpers soldered across the lugs and now it works fine.
K4HX Rating: 2002-12-09
Great, if you have tubes! Time Owned: more than 12 months.
I would give this little amp a "5" rating, except for the fact that it uses obsolete tv sweep-tubes (4), which don't last long, and are getting hard to find, and rather pricey! (around $40/ea.)

The unit is well built, looks very nice, and operates smoothly, putting out about 500w...as long as you have a good set of tubes in it. *BUT* No matter how gentle you are in the way you use this amp (I "babied" mine, always tuning it up quickly and carefully), sooner or later you are going to fry one or more of the light-duty 6MJ6 tubes! I believe 6LQ6's will also work in this rig.

Don't buy one unless it comes with plenty of spare tubes, or you plan to do a conversion to the Svetlana sweep-tube replacements! Otherwise, it's a sweet little amp...