That's probably a General Radio (GR) Strobotach. Wish I had one.

Bill Jeffrey
=======================

Henry Kolesnik wrote:

I just got this black box with no mfg or model #. It's 6.5" wide x 8" high
x 7.5" deep with a 5.5" reflector for the strobe tube. It has 3 tubes a 6X5,
6N7, and a 1D21/SN4 srtobe tube. A big front knob controls a dial that is
visible on the top with 2 scales on the dial: 6 to 37 and 25 to 145. If
anyone can ID the mfg and model I'd like to see if I can find a schematic.
tnx
hank wd5jfr

I've got one that fits the description you gave. Mine works ok (last time
tried, 10 or 15 years ago). I'll get it out and see what the data plate
says. (might be one or two days) I was thinking there was a schematic glued
inside the case to one wall, but I'll check that too. This one I have became
military surplus when bombers changed from reciprocating engines to jet
engines. I think (think, I repeat) this one was used to view propellers in
motion. Blade tracking and such I imagine.
Old Chief Lynn (AKA W7LTQ)

"Henry Kolesnik" wrote in message
...
I just got this black box with no mfg or model #. It's 6.5" wide x 8"
high
x 7.5" deep with a 5.5" reflector for the strobe tube. It has 3 tubes a
6X5,
6N7, and a 1D21/SN4 srtobe tube. A big front knob controls a dial that is
visible on the top with 2 scales on the dial: 6 to 37 and 25 to 145. If
anyone can ID the mfg and model I'd like to see if I can find a schematic.
tnx
hank wd5jfr

I just posted a pix to: news alt.binaries.pictures.radio
tnx
hank wd5jfr
"Henry Kolesnik" wrote in message
...
I just got this black box with no mfg or model #. It's 6.5" wide x 8"
high
x 7.5" deep with a 5.5" reflector for the strobe tube. It has 3 tubes a
6X5,
6N7, and a 1D21/SN4 srtobe tube. A big front knob controls a dial that is
visible on the top with 2 scales on the dial: 6 to 37 and 25 to 145. If
anyone can ID the mfg and model I'd like to see if I can find a schematic.
tnx
hank wd5jfr

Hi,
That's a model 631B (or BL, if it has a toggle switch on the back
marked "direct - slow," for 1/10 range.

73, Alan

It has an unlabeled toggle switch on the back and 2 pin female plug as well
as phone jack. The wire to the phone jack has been clipped?
hank
"Alan Douglas" adouglasatgis.net wrote in message
...
Hi,
That's a model 631B (or BL, if it has a toggle switch on the back
marked "direct - slow," for 1/10 range.

73, Alan

On Mon, 12 Jan 2004 15:07:51 -0600, "Henry Kolesnik"
wrote:

I just posted a pix to: news alt.binaries.pictures.radio

Henry -

It is part of a General Radio Type 631-B or 631-BL Strobotachometer.
The plate that identifies it was on the top of the case, which is
missing. It was probably manufactured in the mid-to-late 1950s.

Dale H. Cook, Chief Engineer, WWWR Roanoke VA, WCQV Moneta VA, WKBA
WZZI Vinton VA, WKPA WLNI WZZU Lynchburg VA, WMNA/WMNA-FM Gretna VA
http://members.cox.net/dalehcook/starcity.shtml


Dale H. Cook, Chief Engineer, WWWR Roanoke VA, WCQV Moneta VA, WKBA WZZI Vinton VA, WKPA WLNI WZZU Lynchburg VA, WMNA/WMNA-FM Gretna VA
http://members.cox.net/dalehcook/starcity.shtml