On Sat, 5 Sep 1998 14:36:06 -0400 "Paul Christensen" <paulc@mediaone.net>
writes:
>installed is
>AFTER the feedthrough. However, another failure occurred. One of the
>four
>H.V. diode "blocks" is shorted. It is marked...
>
>SEMTECH "SLIMPAC"
>SCH 5000
Those were 5000PIV 750ma Paul....I have several that I removed from
NCL-2000 "repairs" . The K2AW is probably a better choice particularly
if you can heat sink them.
>
>Does anyone know if Alpha/Power is still carrying these? I believe my
>77Dx
>used the same type. If I cannot obtain an exact replacement through a
>web
>search, would it be prudent to simply replace all four with a newer
>type?
>Does the "infamous" K2AW Silicon Alley have these? I measured the
>forward
>and reverse resistance of the remaining three H.V. "blocks" and they
>all
>measure identical. Is it safe to assume that they are not on the
>ragged
>edge of failure?
>
>In my search for a spare vapor-cooled 3CV1500A7, I not only found one
>new-in-the-box, but I also "coerced" the seller into letting me
>purchase his
>new Alpha PA-70V which is in its original box with only a few hours on
>it.
>This is one of the few times when I really got lucky!
If you ever come across a PA-70V that was modified with the 3CX1000A7 and
want to sell the tube , let me know. I use one in a HB 2M amp and could
use a spare...just in case. BTW, there were 2 distinct versions of the
3CX1000A7 and the difference was in the depth of the keyway hole. I need
the deep hole version ( no Monica jokes please!) or I would buy the other
socket/tube and do a 222MHz version.
I love that tube...instant on, 45W grid and is basically an 8877 with
balls.
73 Carl KM1H
>
>To be safe, I'll probably change out the H.V. feedthrough, H.V. wiring
>and
>perhaps upgrade the plumbing as I had recently done using all Teflon
>components. Does anyone know the life expectancy of 20KV silicon
>rubber
>high voltage wire?
>
>-Paul, W9AC
>
>
>
>--
>FAQ on WWW: http://www.contesting.com/ampfaq.html
>Submissions: amps@contesting.com
>Administrative requests: amps-REQUEST@contesting.com
>Problems: owner-amps@contesting.com
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>
>
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