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  1. 73's de Edd

    G & E Bradley CT471C

    Referring to the schematic . . . . MR 14 & 15 are being two of the diodes in their configuration as a Full Wave Bridge rectifier that feeds their developed DC to the instruments 1 ma meter movement. They are on the right half of it and I erroneously referred to a pair of cathodes, while it is...
  2. 73's de Edd

    G & E Bradley CT471C

    Nope . . . . ASIDE . . . . I just now, read back, and saw that you did replace C34 and C22 . . . that's good . . . I did do some ESR testing with a scope . . . Was that being in the manner . . . . that you feed a 100KHZ sq wave signal into the scope . . . from a function generator and then...
  3. 73's de Edd

    G & E Bradley CT471C

    SIr Sinewave . . . . . I acknowledge your tests and their results, now we need to further delve into it, to find that if any circuitry tied into that amp string, is not additionally influencing it . That specifically would be the additional use of that same E-cap to additionally shunt . . ...
  4. 73's de Edd

    G & E Bradley CT471C

    Sir Sinewave . . . . . I say there . . . . let's break your unit down by sections . . . and then do an analysis of the cause of your instruments recurring / onset case into VNS Syndrome . (Violent Needle Swing ). Starting with the AC/DC amp section and detector / meter amp circuitry...
  5. 73's de Edd

    Altec Lansing BX1121 Pinout

    Sir Crippy . . . . Reference to: https://www.electronicspoint.com/forums/threads/i-have-a-altec-lansing-bx1121-audio-powered-sys-i-need-to-hook-up-9-pinmini-din-wires.275693/ Now, if you " apprehended " and properly " congested " all of my info contained within that posting, all was...
  6. 73's de Edd

    How do digital sewing machines fail? Is there often a visuall clue on the circuit board?

    Sir MidAtlantian . . . . . In following relevant circitry traces, had those 3 unconnected "dud" solder domes been electrically interfaced, that would have been my guess for the inputting of the speed control , as the left side of the '393 is where the time constant parts of the circuitry are...
  7. 73's de Edd

    H96 Pro plus voltages - no 3vs in board, no signal hdmi, no led light, no turn on - Pics HR inside

    Sir CaLaVeRaK . . . . . Hey Feller . . . . where'd ya get that replacement UN - fusible resistor ? On the closest components marking . . . . is its marking being . . . DC ?=? E2H or E24 If being E24 . . .suspect it to be this unit with voltage in at pin 1 and reg output at pin 5 ...
  8. 73's de Edd

    How do digital sewing machines fail? Is there often a visuall clue on the circuit board?

    Sir MidAtlantian . . . . . Now . . . . in my making a full implementation of your photos . . . GOOD PHOTOS ! . . . . The black paired AC input inductors serve bidirectionally . . . both for filtering any possible sporaidic fast rising incoming AC high voltage line spike(s) and also back...
  9. 73's de Edd

    How do digital sewing machines fail? Is there often a visuall clue on the circuit board?

    Sir MidAtlantian . . . . . The most likely failure would be the failure of that units IRF620 Power FET, with a shorting of its drain to source . of .pin 2 to 3 as per Or possibly the glass bead diode just above it, or the blue paint tipped disc ceramic capacitor / or /MOV, just to its...
  10. 73's de Edd

    How do digital sewing machines fail? Is there often a visuall clue on the circuit board?

    Sir MidAtlantian . . . . . Any chance that this is being the PCB that you are finding residing within that unit of yours . . . .if so the problem is probbaly the TO-220 cased power semiconductor device located at the far left center . . . in its being shorted. Pass on to us, all of the...
  11. 73's de Edd

    Vintage Radiomobile 501T question

    Sir Hematite243 . . . . . Need a photo of the bulb envelope and basing and physical measurements thereof. For that '61-2 ish vintage unit it would be a 12-14 VDC lamp and not over wattage / current, in case of any nearby plastic dial plate that might be discolored / melted. I'm thinking of a...
  12. 73's de Edd

    Help Identifying a DC Power Jack for replacement

    Sir Scottc12 . . . . . I just now see that this info was left from the top post, as another part . . . I was surprised by the way that outer connector case split, in just the way that it did. Thereby it was exposing the pic #1 view, that is showing the pressure contact that the inserted...
  13. 73's de Edd

    Help Identifying a DC Power Jack for replacement

    Scottc12 . . . . . I used to always have BIG problems in identifying the outer diameter of the barrel if being on a female jack, without having the mating plug to take its dimensions from. OR The somewhat easier center pin diameter, unless I compared it to a close size of my numbered drill...
  14. 73's de Edd

    Philips PM 3262 Oscilloscope evaluation/troubleshoot.

    Cosmetically . . . . its dust cap is missing from Hoz timebase knob . The scope probe being used, needs a very slight trim in of its compensation, as it is leaning towards its low end freq response as it is being shown.. Overall, that's . . . . being one hell-uv-a "beginner scope " . . ...
  15. 73's de Edd

    Philips PM 3262 Oscilloscope evaluation/troubleshoot.

    Both channels vert amp cal knobs are off from cal positions. . . . .whadda ya' expect from a chicken farmer . . . . moonlighting on e- Bay ?
  16. 73's de Edd

    Vintage Mica Cap Value ?

    Sir Howard E e e e e e e e e e e ! Ahhhhhh yes . . . ye olde tyme model H725 . . . and I must have upwards of 3-4 working units of the better 832-835 *** series out in my garage. With one being a " listener ". . . if I'm working out there. (*** That's being a fancier cabinet...
  17. 73's de Edd

    How do digital sewing machines fail? Is there often a visuall clue on the circuit board?

    You could at least give the brand and model number of that unit .
  18. 73's de Edd

    Vintage Mica Cap Value ?

    Provide the model of the Zenith . . . then it will be no problem.
  19. 73's de Edd

    Dynamo Air Hockey Table Need help with main board

    Sir roastedrick . . . . . It looks like Valley and Dynamo are wed and now sleeping in the same bed . . . so look at these supplied links and see if it shows electro / mechanical similarities to your unit . . . . My most significant observation is the use of a hefty storage battery to be...
  20. 73's de Edd

    Help with LED sign (Silent Radio) power supply please

    Sir slywuf . . . . . I would just gradually creep up with the supply level to the LED's, until . . . one / they . . . can just be seen to illuminate and then evaluate to see if the system can be seen as operating. I just hope that blank 28 pin socket is surplus or for more memory info . ...
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