![]() You can read more about these clocks here. Other Heathkit clocks, like the GC-1000 Most Accurate Clock, the GC-1195, GC-1197, and so on would also be of interest.
Don't worry about whether the clock is working or not. Even if it doesn't function, I can always use the parts. Speaking of parts, I'm also interested in finding MM5311 and MM5315 clock chips, 7441 and 74141 driver ICs, and Nixie tubes to build and repair other old clocks. (I have more information about Nixie tubes here.) If you have one of these clocks, or some spare parts, gathering dust or headed for the trashcan, please drop me a line! |
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![]() ![]() For instance, the stopwatch to the left is from 1973, uses Panaplex display elements and requires four 'C' cell batteries to operate. For more information, click here. If you have an old digital stopwatch like these that you'd like to part with, please send me an e-mail!
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![]() If you have one of these clocks, or some spare parts, gathering dust or headed for the trashcan, please drop me a line!
From the 1968 HP Catalog:
2509A Digital Clock is a precision time source used to supply time information to the data system and initiate measurements at predetermined intervals. Time-of-day is available visually and as an electrical output. It supplies time on demand, permitting associated system to operate independently of clock. All solid-state, it features pushbutton selection of timing outputs at intervals from 1 second to 1 hour. Time reference derived internally or from external 1 pps signal. Provision for 100 kHz external reference optional. Easy manual or remote time set. BCD output. Panel height 5 1/4" (133 mm). Price: 2509A, $2,250. |
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![]() If you have one of these clocks, or some spare parts, gathering dust or headed for the trashcan, please drop me a line!
From a description in a training manual:
The clock provides time of day and the calendar: month, day, hour, minute, and second. As the months roll by, the calendar remains correct as long as the clock has power. A built-in computer knows how many days are in each month. Only once every 4 years does the calendar require operator intervention, to set the "leap year" switch. The clock outputs calendar and time onto the Interface Bus for any desired destimation such as a data plot or printout. The clock also displays calendar and time on its LED (Light-Emitting-Diode) readout.
From Hewlett-Packard Journal, January 1975:
The Model 59309A ASCII Digital Clock gives absolute time in seconds, minutes, hours, days, and months. When connected to the HP interface bus and asked to talk, it outputs the time on the bus. A block diagram is shown in Fig. 3.
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Software I have written software to communicate with the clock using a relatively inexpensive USB-to-HPIB interface. You can read about the software and see the source code here.
Problem Unit I have a 59309A with an odd problem. It appears to function correctly - the display shows the date and time, the front panel buttons and switches update the display, and the back panel configuration switches (at least A6 and A7) correctly control the mode (at least according to the illumination of the ADDRESSED LED). The problem is that the display (all segments of all digits) blinks at the rate of several times per second. Pressing the PUSH TO READ button causes the display to stop blinking, but the flashing resumes after releasing the switch. I have not connected it to an HPIB controller. There is no 9 volt battery installed; the shorting pin is in place. Any ideas on what to check for?
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From Texas Instruments' history timeline:
TI's first light emitting diode (LED) digital watch featured a black plastic case and a red LED digital display. Eventually, watches of this type were reduced to sell at a suggested retail price of $9.95. You can read the guide that came with the watch here.
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I'm interested in finding a working Beckman WWV receiver. Model 905 is
circa 1965.
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![]() ![]() 640 110V 60CY 5W 4 RPM (UL) BL1RC 6-60
This decodes to:
The output gear has 21 teeth.
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![]() ![]() I'm looking for a replacement movement mechanism to return this tabletop clock to functioning condition.
The label on the back
indicates the following:
The response I received from Howard Miller was that this model was last manufactured in 1986 and has been discontinued now for more than a decade. Unfortunately, no parts are available from them. If anyone has one of these movements, perhaps in a clock they no longer wish to keep, please send me an e-mail. |
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I have four identical six-digit clocks from Chrono-Log marked as
model 70,071-011. There are no controls on the front, and only a single
power switch on the back. Protuding from the back is a slotted card edge connector
with a total of 80 connector traces (40 on each side, organized as 32 and 8 with a
notch in between).
I'm looking for a technical manual for this clock, specifically the pinout specifications for the connector.
I also have a Chrono-Log 70,101-412, which is similar to the 071-011 model except for the addition of mode and setting switches on the front panel.
I also have a Chrono-Log 70,233-412, which is very similar to the 101 model except that it displays month and day rather than just a day number. Correspondence with Chrono-Log reveals that they no longer have documentation or manuals for these 1980's-era clocks. |
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Here's a switch. I have an Operating and Service Manual for
an HP K79-5214L 24 hour digital clock.
I'm looking for the actual 5214 device, or at least more information about it (like a picture or dates of manufacture?). |
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![]() ![]() The photos here show the male end coming from the Hewlett-Packard 58532A GPS receiver. Click here for more information. |
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![]() Click here for more information. |
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![]() As you might expect, I'm looking for a manual. The tens-of-seconds digit doesn't light up, but the clock itself appears to keep time. Also, one of the three push buttons on the bottom appears to be missing or broken. So, I expect I'll be needing spare parts as well. There is a mention of this clock on page 50 of Michael Robbins' book Electronic Clocks and Watches. The caption reads 'A TTL clock with seven segment incandescent display.'
The brochure lists ESE headquarters as 506 Main Street in El Segundo. |
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Also from ESE, I have an early digital timer, model ES-572CM, but
no manual for it.
The timer has a 24-pin connector on the back, for which I would like a pin-out description. |
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I have a couple of General Electric model C4505D clock radios
where the clock runs fine but the radio section does not function
correctly (static, low audio output).
I'm looking for a schematic that covers this model. |
Send leads or offers to Dan Veeneman
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Updated May 22, 2023