My NCL-2000 is now close to half a century old, and still works
perfectly. I got it cheaply, roughly 20 years ago, when it was in bad
condition due to dead filter caps, some dead bleeder resistors, and a
minor problem in the bias circuit. The repair was easy, and was helped
by the amplifier's user manual giving all service information one may
need for a device as simple as this.
I consider this to be a "good" design, because longer lasting filter
caps simply weren't available when it was made, and because adequate
service information was provided with it. It has lasted until becoming
obsolete (quite a few years ago), and still lasts.
I would use it more, if it wouldn't make this nasty blower noise.
Currently I only switch it on for a while when I absolutely need it to
finish a QSO while the propagation is going. I hope to soon take it out
of service, when my solid state EER squeme goes online. But at that
point I won't throw it away! It has life left in it, so I will likely
find a noise-resistant buyer and a loving home for it...
Manfred
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Visit my hobby homepage!
http://ludens.cl
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