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JohnD

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JohnD last won the day on June 21 2020

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About JohnD

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  1. Well the circuit module for the 5Y23 is Pt No 4001-527 and the coil number is 4002-522 if that helps. The same circuit and coil will also be found in the 5Y22, 5Y30, 5Y31, 5Y32 and 5Y39 movements, so this will widen your search for a donor.......
  2. Does this help, Seiko cal. 38 series from early 1970's...
  3. I missed the degree of error (10's of seconds a minute) in the original post but 'double stepping' of the rotor does sound more mechanical related than the possibility of the oscillator running fast, as surely that would still single step, just at a faster rate than once very second?
  4. As the watch has been left in a drawer for a number of years prior to a new battery being fitted, my money is on nothing more complicated than dried up lube causing the problems, shown up when the watch is warmed up by wearing it. I have about 50 pre 1980 Seiko quartz analogue watches and this is a very common problem with watches that have been stored for a number of years.......
  5. Thanks a lot for that, I have a couple of non-working Seiko 3303's that I can now look at in a new light.?
  6. It does a lot more than that....I've even been able to time a Timex jump minute hand quartz that only emits one pulse every 60 seconds..... They do appear for sale occasionally. I got very lucky and picked mine up a couple of years ago for less than £200, but I did have to drive a 240 mile round trip to collect it as I wouldn't trust a carrier with it! This is a useful document...... 1189973045_1980.07SeikoTechnicalGuideGeneralInstructionAnalogQuartz.pdf
  7. One of these is 'useful'........ I dread to think what they cost new about 40 years ago....?
  8. Fascinating video. A five year apprenticeship as a scientific instrument technician gave me the necessary skills to emulate that, but I no longer have access to suitable workshop facilities, or I hasten to add, the patience any more.....
  9. I have the similar book on Ferranti electric clocks...
  10. And worth a bloody fortune!! (Current value for similar about US$12,000)
  11. This is the mechanism in the 'Floodlight alarm' identical to the other alarm that I have other than a simple cam mech to turn the dial light on at midnight and off at 8am, which sadly doesn't work as the secondary winding in the coil that turns it into a 3volt transformer, is open circuit.... Note the use of Meccano to hold the movement in the case ? This is what it looked like when I got it......?
  12. Well Andy, all of my early ones are made by 'Ferranti'. This is their 'Model No2', and was made between 1932 and 1936, (shown prior to restoration) This is the 'Model No4', again 1932 to 1936, Both of the above have the 'broad spade' hands so date to 1932/33.. This is the 'Model No8' alarm, which dates from 1936.... This 'was' originally a 'Model No6' 'Floodlit' alarm, made between 1936 & 1938, but about 60? years ago someone broke the Bakelite case and then rehoused the works in a home-made wooden case (which I have attempted to 'sympathetically restor
  13. Don't know about '1950's technology' Andy. I have five that were made before 1935, so really from an age when Mallard was setting the world speed record for a steam train and Frank Whittle was still in the theory stage of Jet engine development...? A bit more 1935 technology HERE.........
  14. Sorry about this... Rich mixes the lume colour himself to match, here is another one that he did for me and re-lumed the hands to match the existing lume dots on the dial....
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