The idea of re-tubing an NCL-2000 with Svetlana tubes is quite
intriguing. I would think it would be virtually certain that the 4CX400A
would fit, since it is slightly smaller in diameter than the 8930, which is
in turn slightly larger than the 4CX250. While this might not make legal
limit by the datasheets, it's probably a good match overall (plate
dissipation, power supply, etc.) to the original 8122s. They are, however,
relatively inexpensive - RF Parts sells them for $140 each, and I suspect
somebody like W4TH might beat that price.
I've had good results from the 4CX800As in my Alpha 91b, however these are
larger in diameter and might not fit the NCL-2000 chassis layout.
Dave/K8CC
At 10:17 AM 9/30/03 -0700, Steve Katz wrote:
Hi Rich,
I'll bet the Svetlana mod would be do-able, and probably cheaper than almost
any other mod, but I've never tried it. Next time I have an NCL2000 on the
bench with dead 8122s (it will eventually happen!), I'll suggest this to
whoever owns it and would be pleased to tackle the job! Years ago I
modified one NCL2000 to 8874s in GG, and it worked out well but certainly
was not cheap. I added a tuned input board, which added about $100, not to
mention the horrendous cost of the tubes....-WB2WIK/6
"Success is the ability to go from failure to failure with no loss of
enthusiasm." -Winston Churchill
> -----Original Message-----
> From: rlm [SMTP:r@somis.org]
> Sent: Tuesday, September 30, 2003 9:30 AM
> To: Steve Katz; AMPS
> Subject: RE: [BULK] - [Amps] NCL 2000?
>
>
>
> >It's a very pretty amplifier that is, of course, also quite old, c. 1966
> or
> >so. As such, if it has its original filter capacitors they should be
> >replaced, along with their equalizing resistors. The 8122 replacement
> cost
> >is scary, but many have converted to other tubes successfully. ...
>
> EUR Steve -- would conversion to Svetlana 4cx400s or 4cx800s be do-able?
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