[Hammarlund] SP-600/Black Beauties/Transitional Piece?

[Clemens Ostergaard]

My JX-17, serial no 17566 *was* full of BBODs, some split, seemingly in
contradiction with the literature.

Best,

Clemens

On Thu, Mar 8, 2012 at 3:21 PM, rbethman <rbethman at comcast.net> wrote:

> Joe,
>
> This particular one may have had the cans changed during its past.
> There really is no telling.
>
> It is good that you checked!
>
> Bob - N0DGN
>
> On 3/8/2012 9:18 AM, Joe Connor wrote:
> > I'm currently working on an SP-600 JX-17 serial number 17,2XX. Under the
> chassis, it has all ceramic-disk caps that appear to be factory-installed.
> I breathed a sigh of relief because that will save me a lot of work.
> According to the literature, Hammarlund converted to ceramic disks at
> around serial number 17,5xx. I figured I had lucked out.
> >
> > As I went into the IF cans to make sure the resistors were within spec,
> I was surprised to find that both 455khz IF cans had black beauties. They
> were, of course, leaking badly. The 3,955khz IF can had ceramic disks. I
> opened the T-9 can and looked into the RF deck with a flashlight and saw
> all ceramic disks. It was strange that only these two IF can had black
> beauties. Maybe Hammarlund was simply using parts that it had on hand?
> >
> > The morale of the story seems to be this: even if you have a set that
> appears to have all original ceramic disks, it's a good idea to peak into
> the hidden areas to make sure that a black beauty or two aren't lurking
> about.
> >
> >
> >                                     Joe Connor
> >
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