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  1. 73's de Edd

    Lab Volt Model 790A will not power up

    Sir Willard . . . . Nope that Simson doesn't have that high of a voltage capability, it's basically for 500V, but plugging into right bottom corner doubles the range up to 1000V. On any one of my 1-2-3-4- Five TRIPLETT 630NA's . . . .akin to your unit, has one plug in receptacle that...
  2. 73's de Edd

    Newbie help please- Omron relay

    https://www.amazon.com/Advanced-Electronics-Omron-General-G8P-1A4P-12VDC/dp/B074ND19FC Check post #7 to confirm your units coil resistance.
  3. 73's de Edd

    Unable to find replacment potentiometer

    Sir HFoster . . . . . . . . . . . . . . . The VR201 is just their generic component identification assignment of the control. For example VR is variable resistor assigned to one SECTION of the unit, its associated neighbors should be VR202 VR203 its sections capacitors should be C200 C201...
  4. 73's de Edd

    Sewing machine speed controller repair

    Sir whiteoutage . . . . . Just two wires are being involved with the dimmer power control path in the submited explanation. HOT AC line power comes down and passes thru the lamp then passes down into the dimmer as the PURPLE DOT path unitil it reaches the TRIAC power controller YELLOW...
  5. 73's de Edd

    Analog guitar amp with digital meter

    Sir Still buildin . . . . . OK I moved back to the very first of your photos with some good flat board shots . CONFIRMED . . . that the zig zag path from stake J2 which is your system power ground does route to closest gold pad and is soldered to assure a definite ground to the frontal...
  6. 73's de Edd

    Analog guitar amp with digital meter

    Sir Still buildin . . . . . Kudos ! . . . .on your photo support / supplifications . . . with them being just what is now needed.. Now after some squaring up . . .resizing to scale . . .paralllax correction . . . (triple lll is when its reallly bad). . . we then come up with the supplied...
  7. 73's de Edd

    My brand new oscilloscope

    WD-50 . . . . . IS . . . . . being the excess use of WD-40. . . . .however, with being in that state now, it certainly is being a nice / effective fly repellent ! In the parts list it is shown as a 14V bulb and with that 0.75W spec, with its 53/4ma current consumption . . . and if HAVING to...
  8. 73's de Edd

    Analog guitar amp with digital meter

    Sir . . . .(are you ?) . . . .Still buildin Refer to the submitted CURTIS INSTRUMENTS sheet and its PARAGRAPH 4 of pages 14 and 15. There you have the model 700 resettable unit and the model 701 unsresettable (supposedly) unit. Ignore the following 703 model, as its just being a unit...
  9. 73's de Edd

    My brand new oscilloscope

    Sir Steve . . . . . And just to think, that back in the late 60- early 70's one of my engineering crew was desperate for rent money coming up and was trying to sell both his Hoolet Plastered, state of the art of miniaturization DVM and his Telequipment scope. His was being the dual channel D54...
  10. 73's de Edd

    Small SMD Fell Off Motherboard

    Right sure that your handling did not bump into and whack / impact it off ? The whole cluster of bypasses / decouplers are probably of the same values and being monolithic layer ceramic and probably all being 0.1 ufd at 50-100VDC rated.
  11. 73's de Edd

    Lab Volt Model 790A will not power up

    Thir Willard . . . . . Well I see that my good friend from Bucharest "Hungry" has now come upon the scene. He had been asking me repair info about a goldmine of 18 pieces of lab equipment that he has just came into. He must have read and liked your topic also . Here is my earlier mentioned...
  12. 73's de Edd

    Timer circuit help

    I done that timed spraying to my 3 ton refrigerated air conditioning units outside condensing unit, years before it was even being considered, except in commercial situations. That, along with a sun barrier for that outdoor unit, has done wonders for its longevity- - - shorter run time- - -...
  13. 73's de Edd

    Suggestions on analog galvanometer ?

    NEVER . . . . would have interpreted that, with the sole initial info supplied. I don't think that you will have any success in the degree of reforming required to the original pointer needle of that unit. Probably, will need just a stub of the original needle and a conjoining of the aluminum...
  14. 73's de Edd

    Timer circuit help

    SIR paul60 . . . . Your locale is not being provided, other than your having " spunky monkeys in your garden" , which might suggest of the tropics, which might relate to your having adequate and frequent rainfall . . . ergo . . .quasi distilled water plus adding additional micro particulate...
  15. 73's de Edd

    Porcupine Transformer

    Sir Al Slitter . . . . . Correct me if being otherwise, but it looks like the RED wrapped portion is being the AC line voltage primary winding and the BLUE wrapped section is being all of the separate and isolated secondary windings. With the primary, possibly of having two series coil...
  16. 73's de Edd

    Suggestions on analog galvanometer ?

    Ayyyyyyyy Caramba ! . . . . . . . parace ser, que es Externet . . . . . . . NO Internet . . . . pero . . . . Externet ! You got answers ? . . . . . . then I'se gots questions . . . . a la Rat Shack I have to glue a 15mm x 10mm x 1mm ***** mirror to its pointer. Do you see an alternative...
  17. 73's de Edd

    GE radio 7-4135

    Sir spythe2 . . . . . BEHOLD . . .it's a MIRACLE ! Submitted herewith is your units schematic . . . The rest of the story . . . . It was retrieved from my inherited massive technical documents collection of paaaaased brother in law ***. I had written down your model number on a Post-it and...
  18. 73's de Edd

    Lab Volt Model 790A will not power up

    Condolences . . . . . . . until that pain in your heart subsides . . . . for the most adored woman in your life . . . and for certain, the most IMPORTANT one .
  19. 73's de Edd

    What should I do with unused outputs?

    SEND THEM TO ME ! I can dern sure use them . . . . they will be well received . . . and therefore, not be wasted.
  20. 73's de Edd

    Lab Volt Model 790A will not power up

    Sir Willard . . . . . And so I said to myself . . . . . . . MYSELF, now doesn't the front panel of that unit seem all so familiar . . . like a B&K ? I then see by the physical scaling of the mu metal shield around that units CRT, that it is smaller than expected, with me initially thinking of...
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