Date: Thu, 30 Jun 2005 12:30:12 -0700
Subject: Classic Analogue Boards Update
From: <[EMAIL PROTECTED]>
Message-ID: <[EMAIL PROTECTED]>
Apparently
Samsung made the earlier board and Hitachi made the later board. Possibly
they redesigned it for the Classic II and then moved all the Classics to the
new one when the Samsung contract was finished.
I think I mentioned this once before a couple of years ago...
While Googling on the Samsung part number for the CRT I came across
an interesting part.
It was a CRT (same part number) and deflection(?) board for black and
white security monitors. I ordered a few (brand new CRTs, woo hoo!)
and was surprised to discover that the attached circuit board is very
very similar to the analog board on a Plus. I haven't traced a
schematic, but many of the major components found on a Plus board are
also on this board, including the BU406 and the 3.9 UF non-polarized
cap, etc. So I didn't just get CRTs for my money (which is nice
since I paid a bit more than I wished) but also flybacks, BU406s, etc.
It may be similar to the SE board as well. I mention the Plus
because that's what I'm familiar with. I've never had an SE and only
recently bought a couple of SE/30s.
So, Samsung was selling a board very similar to the Plus analog board
for B&W video monitors. Which makes me wonder if Woz or whoever, got
the design for the video portion of the analog board from a Samsung
White Sheet, or just took a security monitor apart or what. I wonder
what the engineering design connection was.
Jeff Walther
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