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  1. kellys_eye

    What are specs on this cap?

    BTW the line voltage (248V) should be ok if all else is working properly. You shouldn't need a buck-boost transformer (show it please, I'm guessing you mean VARIAC?) - is it suitably rated?
  2. kellys_eye

    What are specs on this cap?

    This looks like C4 - and it's typical of a 'motor start' type capacitor which do have a tendency towards failure. If it changes VALUE it will also cause issues. Doesn't necessarily have to be shorted (or open) to give a fault condition.
  3. kellys_eye

    What are specs on this cap?

    Have you tested the thyristor according to the method I mentioned in #14? The 'half clamping' voltage comes from capacitor dropper C4 and that may be dodgy. If it's gone short you'll always have full clamping. If the thyristor tests faulty and needs replacing that's no real problem. The...
  4. kellys_eye

    What are specs on this cap?

    The melted plastic on the spade connector seems to be from the dodgy switch contact causing arcing/heat and melting - nothing we haven't all seen before. Polarity? What about the stop switch? Did you check the contacts Seems to me you got the wiring wrong on the STOP switch.
  5. kellys_eye

    What are specs on this cap?

    Has the wiring been changed at any time? Have you tested the bridge rectifiers on the chassis?
  6. kellys_eye

    What are specs on this cap?

    Indicates the SCR is short.
  7. kellys_eye

    What are specs on this cap?

    To test the SCR, connect the positive output lead of the ohmmeter to the anode and the negative lead to the cathode. The ohmmeter should indicate no continuity. Touch the gate of the SCR to the anode. The ohmmeter should indicate continuity through the SCR. When the gate lead is removed from the...
  8. kellys_eye

    1954 HMV radiogram record player change.

    The plugs are called BANANA plugs (4mm). You are unlikely to get them in the same size/shape as the old version you now have but the modern ones, although longer, will fit the socket. To repeat (and perhaps clarify) connect the RED and BLUE together and then to the YELLOW plug. Connect all...
  9. kellys_eye

    1954 HMV radiogram record player change.

    The tone arm clearly has a stereo pickup and your amplifier has a mono input. Tie the two screens (braids) together and connect that to the braid of the amplifier input. Connect a 1k ohm resistor to each of the other wires (red and blue). Connect the free ends of the resistors together and...
  10. kellys_eye

    Veeder Root 6 Digit electric counter . Does it work ?

    The unit counts the number of applications of 115V. Every time you switch it on it will advance ONE step so you have to 'pulse' the 115V supply for it to count continuously.
  11. kellys_eye

    Silent Switch for MIDI Surface Controller

    'Noisy' key switches are as a result of them using a domed metal disk that provides the 'spring return' needed to keep the key 'open'. The only other types that are actually noise free are those with genuine springs - as you might find on a computer keypad - or that operate using resistive or...
  12. kellys_eye

    arduino and raspberry pi books on the internet archive

    "Site can't be reached"......
  13. kellys_eye

    1954 HMV radiogram record player change.

    Not '4-wires' but two independent screened audio cables. Potentially they might go to the volume control - and back again. i.e the blue carries the audio TO the volume control and the red carries it BACK to the amplifier. Another potential route is from the record deck pick up arm - the...
  14. kellys_eye

    How to troubleshoot single dim bulb/socket on Delco radio pcb?

    If the radio still works then just hardwire another lamp into the circuit, taking the supply from 'wherever' on wire tails from the new lamp - or hot glue the new one into place.
  15. kellys_eye

    How to troubleshoot single dim bulb/socket on Delco radio pcb?

    Bad idea. The 9V could have damaged circuitry on the board - shorted a diode, blown a transistor etc. Without a schematic we'll never be able to determine what it is you did.
  16. kellys_eye

    Switch question

    You need a relay. Use the thermostat contacts to power the relay coil (just a few milli amps so no problem with contact ratings) and the relay contacts themselves to power the heater element. Look for a DPST relay with AC coil (suited to your local AC voltage) and contacts suitably rated i.e...
  17. kellys_eye

    How to troubleshoot single dim bulb/socket on Delco radio pcb?

    It's proper name is 'conformal coating' - not necessarily for waterproofing but stops all sort of issues from occurring, mainly corrosion.
  18. kellys_eye

    How to troubleshoot single dim bulb/socket on Delco radio pcb?

    Please stop using Google for your pictures. This site accepts them directly and should be used - even if you have to resize them.
  19. kellys_eye

    Help with What To Replace Next on Small Board

    The white 6-pin device is an opto-coupler and the burned out 330 ohm resistor was part of the LED side of the coupler. Blowing the resistor has likely blown the opto now so it needs replacing.
  20. kellys_eye

    Triac Question

    This is what I see when I type (dollar sign)15 and (dollar sign)400
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