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  1. 73's de Edd

    MCS 3847 Integrated Amp Noisy Left Channel

    Sir KilgoreCemetery . . . . . Also, I don't have any pictures of the tool I've been using simply due to embarrassment. It's one I made from watching a video and is far more functional than it is pretty. It has a probe (POS), ground wire (NEG), a high-voltage, low capacitance, in-line capacitor...
  2. 73's de Edd

    Old power converter/charger 120 to 12v TRIAD-UTRAD 730-2

    Sir brediaj . . . . . That sounds about like 1974-76 vintage and the AC power cord comes in the front corner as a 3 wire connnector with center being frame ground. On model TU-730 the second numbers are the ampere ratings. here is the TU-740 BIG brother at its 40 amps vice your 30 amps. If...
  3. 73's de Edd

    MCS 3847 Integrated Amp Noisy Left Channel

    Sir KilgoreCemetery . . . . . I don't know of any EXACT schematic of that unit, with it being one of those exotique French " Jeeeeey Czzeeeeeee Peneeeeeeeee modular units . . . . . . via import . . . au Japan as, actually being a NEC. I have been using a probe to "listen in" to the audio...
  4. 73's de Edd

    Bose Wave AWR1-1W Series 3 circuit board photograph request

    Sir Jeremy C e e e e e e . . . . . I no can do bumpie-bumpie . . . .as all of my 3 units are I and II series, with their round toroid power transformers cores and yours is using the central placed, conventional cored unit, . . . . . plus there is being some power supply circuitry...
  5. 73's de Edd

    MCS 3847 Integrated Amp Noisy Left Channel

    KilgoreCemetery . . . . .Attn: of Chief of interment . . . Looks like your unit is going to be developing its noise right at / within the AUDIO OUTPUT STAGES, since your descripton of the effects at earlier stages, designated there being no earlier stage control over that noise. That units...
  6. 73's de Edd

    Amplifier and long distance remote

    . Sir Shawnp . . . . . . OBSERVATIONS . . .coming up If this is going to be for making gaming sounds . . . .that tinny 'lil ole horn speaker aint' a gunna be worth a crap on any faithful reproducing of bull moose / mule deer / boar sounds. Sparrow or songbird sounds . . .yes. Slide on...
  7. 73's de Edd

    Looking for a small project to fill void

    Sir Wiginometry . . . . . Just in case some . . . or ALL . . . . of that circuits Resistor /Capacitor values have slipped your mind . . . . . . The rest of the story . . . . . . https://www.eeweb.com/extreme-circuits/full-duplex-intercom BTW with that stage being nulled out with R7 pot, I...
  8. 73's de Edd

    Newbie needs help identifying correct capacitor replacement

    Sir / Sr . . . . . .eagarcia Questions : Is that unit now puttting out a low /moderate / high HUMMMMMMMMMMM . . .or . . . making more like the noise of an electric shaver running ? Are you good enough at soldering so as to not damage the foils on the board ? Do you have a DVM and familiarity...
  9. 73's de Edd

    Comedy Thread

  10. 73's de Edd

    Stuck with fixing SZBJ DT9205a multimeter selector mechanism

    Sir Erastro . . . . . I now ask you HOW---HOW--- HOW ? could you not have realized the IMPORTANCE of placing an indexing / reference mark, with a SHARPIE, between the rotary knob and the instrument case . . . bet you will take note in the future. Should you ever be field stripping an AK-47 ...
  11. 73's de Edd

    Will this charger work?

    SERIES charging can be " VEWY-VEWY " problematic, you need 3 identical batteries and all of them being at the same state of discharge, or the "BIG DOG" gobbles it up and the weaker one(s) starve.
  12. 73's de Edd

    (1973) Imperial HIFI 2700 stereo decoder and memories

    Sir Richard9025 Actually, the frequency decreased, now its ~75 - 90MHz. Plus I wonder why the voltage is so strange with the 20k clipped. Two reasons : BECAUSE we just had to " Guesstimate" as to the actual value of the " Mystery" resistor shown in the YELLOW BOXED area We are NOT connecting...
  13. 73's de Edd

    I have Sony Trinitron CRT TV 12 years old. It's 21" color.it goes in to standby mode. Gives 4 blink

    My last Sony 21" kine tube was 40 years ago . . . how about giving its Sony MODEL number ? In those olden tymes 4 blinks was the code for loss of vertical sweep and then a resultantt blanking of the video to preclude a phospor burn on the kine face. 73's de Edd
  14. 73's de Edd

    Sound Dynamics subwoofer schematics

    Sir Serge125 . . . . . U say . . . . So iI (sic) must get a 1MΩ pot right? Just for further confirmation . . . . I think that you are possibly short on your comprehension versus your observations. You did not tell which pot it was , as was requested . . .if being one of the two on that...
  15. 73's de Edd

    (1973) Imperial HIFI 2700 stereo decoder and memories

    Sir Richard9025 . . . . . Those were the exact numbers I needed, and that tells us that we have more tuning voltage than is needed, rather than the other possibility . . . . of being way down at a minimalistic 2.7 voltage level. Referring to the schematics MANUAL tuning you can see that from...
  16. 73's de Edd

    Comedy Thread

  17. 73's de Edd

    Fan wires

    You gave none of your original units physical / mounting aspects. BUT that one 560 ma spec says that OEM unit IS moving some air, when its on.. Keeping out of the $90 range of perspective seller/scalpers. See if any of a l l l l l of these offered below will meet your original units aspects...
  18. 73's de Edd

    Help identify a resistor without bands

    NOW . . . . . . how about REALLY breaking that serial info down and actually coming out with . . . . . . 3W for 3 watts R for being the position of a decimal place Then that collectively becomes decimal 27 ohms .27 ohms And then the final K relates its 10% tolerance. All of that is then...
  19. 73's de Edd

    (1973) Imperial HIFI 2700 stereo decoder and memories

    I really need to know what the variable voltage resulting on the RED ARROW line is at those manually tuned 88-98 and 108 tuned in positions. AND THEN you keep the metering at the same points used and then press in the presets one at a time and see what voltage is then read on the RED ARROW...
  20. 73's de Edd

    Sound Dynamics subwoofer schematics

    Sir Serge125 . . . . . So on the meter it starts at 0 then the moment I move the adjuster a bit the needle goes completely at the other end. To check the middle and outer terminal I use an analog meter so I see more clearly at what it does. What you do now is test between the middle terminal...
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