Al -
Yeah, Donnie did a good job with that. We miss his 'special' parts,
especially the little red ones! :-)
I just finished doing a CD for the A-Line, so have some stuff together.
The 11 Tube R-4A started at s/n 4054. The last version started at s/n
5400, and went through to close to 7000 where the B started. The
'model' for the CD was a 6600 series unit, and had several changes from
the last schematic. According to Bill Frost, there were a 'bunch of
changes' just after the last schematic was issued, and apparently not
documented. There were enough changes that I made a 'Revised' schematic
that showed what was actually in 'this' receiver.
Most of the changes from the late "A" to the early "B" receiver were
cosmetic. Most important was the change to black labels above the
'belt-line' on the front panel! The MAIN TUNING knob was 'dished' a bit
to allow a "PTO in USE" light at the fiducial. The AF Preamp was
similar to the late "A", and of course the CALIBRATOR added the 25 kHz
markers. The FET PTO didn't come in until the second version at s/n 8000.
The color-coded crystal system started around s/n 5000. I've not been
able to find any documentation from Drake for it. The T-4X of course
started with the color-coded CO crystals at about s/n 12000 and
continued into the T-4XB.
73, Garey - K4OAH
Glen Allen, VA
Drake 2-B, 2-C/2-NT, 4-A, 4-B, C-Line
and TR-4/C Service Supplement CDs
<www.k4oah.com>
Al Parker wrote:
Hi agn,
I found it -- Donnie's list. It's just for the R-4A's, but he
points out the differences between the 2 versions. I seem to
remember, and Garey can probably comment better, that there were some
more small changes made toward the end of the "late" version, such
that the very late ones were about the same as an R-4B.
Take a look at
<http://www.zerobeat.net/drakelist/r4asurvey.html>
73,
Al, W8UT
www.boatanchors.org
www.hammarlund.info
"There is nothing -- absolutely nothing -- half so much
worth doing as simply messing about in boats"
Ratty, to Mole
On 2/6/2011 4:24 PM, Garey Barrell wrote:
Yes, the R-4 series all are the same serial number string.
The R-4 started at 100 (I believe, I've never seen one below that). The
first schematic is labeled '0001'.
The R-4A started at 2000 with the 13 tube version.
The R-4A continued at 4054 with the 11 tube version.
The R-4B started at 7000
The R-4C started at 16151
The R-4C ended right around 30000. I've heard of 30k+ s/n units, but
I've never actually seen one.
The T-4X started at 10000
The T-4XB started at 13749
The T-4XC started at 20181
The T-4XC ended just over 30000. I've seen a couple with 30k+ s/n.
73, Garey - K4OAH
Glen Allen, VA
Drake 2-B, 2-C/2-NT, 4-A, 4-B, C-Line
and TR-4/C Service Supplement CDs
<www.k4oah.com>
Al Parker wrote:
basically, yes. Take a look at
<http://www.wb4hfn.com/DRAKE/DrakeSNDatabase-P2.htm> I'm not sure if
the "plain" r-4's are included in the series below the R-4A no.s.
Donnie Garrett had a good listing of the s/n's for the R-4A's, but I
don't know where it might be available now, he dropped out of
circulation a few yrs ago. Anyone know?
73,
Al
On 2/6/2011 2:50 PM, Neil M Califano wrote:
Do the R-4 receivers share the same run of serial numbers, the R-4's
the lowest and the R-4C's the highest?
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