Figured this one out on my own. When the plate cap dissipators had been
pulled off of the old 3-500's, the tube's plate cap came with it. Since
this is my first affair with 3-500's, I foolishly assumed that the post
was the standard configuration.
Sorry to have taken up the bandwidth.
73, de Mike, K9UW
Amherst, WI
Mike, K9UW wrote:
>I recently obtained a used 422, complete with two Eimac 3-500Z's that
>were shipped separately. While unpacking the tubes, I managed to
>destroy one of them when it slid out of its tube of bubble wrap packing
>and bounced on the floor. Fortunately, the kids were not home when this
>happened, as the air in the shack got a bit blue before I calmed down.
>The surviving Eimac is now for sale, in case anyone is interested.
>
>Sickened by the experience but determined to get this amp on the air, I
>ordered a pair of 3-500ZG's from RF Parts which, I'm told, are the same
>3-500's that are being shipped with the new Centurions.. They arrived
>this afternoon, but I was surprised to find that the plate caps on the
>new tubes do not match the plate caps on old Eimacs.
>
>The old tubes had a slender shaft (~3/16 x 1/2") that poked out of the
>top of the tube and Ten-Tec provided a plate cap heat dissipator that
>fit over it. The heat dissipator included a screw that secured the
>plate connecting straps.
>
>There is no way that the heat dissipator will fit these new plate caps.
>
>Has Ten-Tec come up with a new means to attach the plate connecting
>strap to the plate caps on these new tubes? The new tube's plate cap is
>bell shaped and appears to be set over the same slender plate cap that
>the Eimac tube had, and this bell-shaped cap seems to be attached with
>some sort of set screw.
>
>A call to RF Parts got me a conversation with a receptionist who could
>not find the Tech Support person, but she advised against trying to
>remove the bell-shaped cap to get at the slender cap inside of it.
>
>My guess, at tis point, is that Ten-Tec has redesigned the plate cap
>dissipator, but this issue has cropped up after they're closed for the day.
>
>Can anyone offer any insights?
>
>Mike, K9UW
>Sleepless in Amherst, WI
>k9uw at wi-net.com
>
>
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>
>
>
>
>
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