I've got an NCL-2000 that has a similar history to yours. Like you, I
seldom use it, but think it is a well-designed amplifier and arguably
the nicest styling of any amp before or since. Replacement tubes are a
problem, of course, but I've got a couple of spares on hand. As I
recall, the bias circuit is quite clever and, with updated components,
works very well.
Interestingly, my NCL-2000 blower is rather quiet and has never posed an
irritation. I'd be interested in hearing comments on that issue from
One design issue I've never liked with the amp is the T/R relay, which
uses a 6VAC coil. This rules it out for use with modern transceivers,
unless one uses an isolation circuit. In my station, I use my StationPro
controllers for my amplifiers, which can accommodate any AC or DC
antenna, so that isn't a problem
On 10/5/2017 8:41 AM, Manfred Mornhinweg wrote:
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...
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