Garey Barrell <[EMAIL PROTECTED]> made an utterance to the drakelist gang
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Bob -
That's the 34-NB. It was an optional add-on to the TR-4 early on. It
consisted of a 9-NB board, with a small additional board designated NBK
that handled the impedance matching to the TR-4 filter (IF) impedance.
The original installation added a lever control behind the Plate knob,
later TR-4s had the NB switch in the lower right corner to accommodate
the option. It's the same NB circuit as the later plug-in version 34-PNB.
73, Garey - K4OAH
Glen Allen, VA
Drake 2-B, 4-B, C-Line & TR-4/C Service Supplement CDs
<www.k4oah.com>
Robert Ladden wrote:
Robert Ladden <[EMAIL PROTECTED]> made an utterance to the drakelist gang
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I just picked up a TR-4 sn 23176. It's dirty and needs work. It does
receive on both sidebands which is very good news. It also has a noise
blanker that works. Judging from the front panel, the noise blanker
was added later. It is not the 34-PNB, but looks like the 9-NB. It is
just a board with no surrounding frame. I thought the 9-NB was for the
TR-6. What noise blanker is it and was it standard on the early
TR-4's? Just wondering. It will be a while before I can get to fixing it.
73,
Bob WW3QB
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