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  1. 73's de Edd

    Help identifying film capacitor on old amp board

    630V rating and is 0.47 ufd . . . . . any vacuum tubes involved ? . . .or possibly just beinhg AC line related, if the unit is solid state.
  2. 73's de Edd

    (Russian) 1978 Radio's audio signal path from cassette deck

    Oh Tay . . . . . as per the attenuation of your post amplifier stages audio output off the radio section of the unit. Build this up and inject audio into the tape stages. Your DA1 is the amp of interest, withit its signal flow as I have marked. The DA2 is related to the record functon. It is...
  3. 73's de Edd

    Power supply for limescale remover

    Sir atha . . . . . What we call water softeners. Why don't you contact the link below and have them inspect their part in stock to confirm its AC or DC output and its marked on voltage and current or watts. The story is . . . . [[[ Since your " dad with dementia " had all of these units in...
  4. 73's de Edd

    How To Control Amperage In A Breadboard ?

    A heavier rated power supply or battery . . . . . . if its max output now is only 2 amps.
  5. 73's de Edd

    A radio from 1920 goes to 2017 !

    That very old radio is not a 1920 . . . . . instead a 1940-1950'ish . . .trust me . . .I was there.
  6. 73's de Edd

    Audio voiceover on TV

    Its a feature that is basically related to your close captioned features called [audio description] you should find it in that or an audio menu category and be able to turn ot off. Program examples . . . .featuring it: http://www.tvhelp.org.uk/audes/schedule.php et al...
  7. 73's de Edd

    Light bar: intended for car battery, but....

    Sir mattfara . . . . . . Why 'soitanly . . . . Those units typically used a plastic " Brick " housing and the majority of the units that I saw, had a plug in AC cord with a small 8 ball shape of AC power plug in. The DC output then had a length of wire with a connector on its end that was...
  8. 73's de Edd

    Sunn Beta Lead Guitar Amp Repair

    Sir Bud . . . . . Parte Deux . . . . . You should be able to test your logic functions just my plugging a phone plug in and out of the three input jacks and seeing if the respective LED’s respond. Then plug in the foot switch and check it out to see if it canges in the same manner.. When...
  9. 73's de Edd

    Sunn Beta Lead Guitar Amp Repair

    Sir Bud . . . . . In reference to that schematic . . . . I initially converted from a two piece to a Unitized copy . . . .with a vest . . .no less ! Then a bit of “ NASSER “ digital area pixel dithering to minimize prior J-peg crusting, then throw in some mathematically averaged digital...
  10. 73's de Edd

    Sunn Beta Lead Guitar Amp Repair

    Sir Bud . . . . . Looking at the Power amp schematic and the separate Pre amp circuitry, it appears to me that all grounds are chassis related. You can even see all connector plug grounds, going to chassis ground. The ONE exception is the shielded cable run where the low level audio input to...
  11. 73's de Edd

    Light bar: intended for car battery, but....

    Sir Mattfara . . . . Easy peasy . . . . . with that all magical spec of 17.46 watts. Round that off on the upper side of 2 amps and use that current spec at 12 volts. OR go upwards to 3 or 4 amps if it is to be on for a length of time or you want a cooler running power supply. ( With a...
  12. 73's de Edd

    Sunn Beta Lead Guitar Amp Repair

    Sir Bud . . . . . This is your initial evaluative homework assignment . . .should you choose to accept . . . .a la Mission Impossible. The power supply for the pre amp is being derived from the snippets that I have extracted from the power amp schematic. Note that there is a disparity in...
  13. 73's de Edd

    What in the heck is a D-TUNER?

    Sir Tony Davis . . . . . This says it ALL . . . .includes everything into and out of it, and its ancillary support circuitry. You can see its 75Ω RF signal input at its left and its 44Mhz output to the initial SAW IF Filter to its right, to then pass to the IF strip. Basic Digital...
  14. 73's de Edd

    Bose Wave Radio AWRC1G left speaker hiss (speaker OK)

    Sir KiloOne Since you have it pulled already let’s start with the Power Audio Output stage to see if the noise is originating WITHIN that potted . . .( no can touchee-touchee ). . . unit. I give you the two GREEN audio channels input pins and their alts at BLUE. Get yourself a test wire with...
  15. 73's de Edd

    Comedy Thread

    What you FIND . . . . is what you GET .
  16. 73's de Edd

    Comedy Thread

  17. 73's de Edd

    (Russian) 1978 Radio's audio signal path from cassette deck

    Pinch rollers and capstan drive will have a layer of dead "rubber " on them. Belts are also inclusive . . . tell me if you have any of them and I will give the separate procedure for them. Any chance that you are familiar with typewriter erasers made either as a round cartwheel with its adjunct...
  18. 73's de Edd

    (Russian) 1978 Radio's audio signal path from cassette deck

    YEP . . . .ABSOLUT . . .ely . . . . . but only on the head.
  19. 73's de Edd

    (Russian) 1978 Radio's audio signal path from cassette deck

    I was surprised with that initially mentioned L7, as it is the second element of a bandwidth filter. With the L6 establishing the rise shape on the first frequency involved and the L10 establishing the fall of the frequency response, That then leaving the L7 and L8 being trimmed to hold up any...
  20. 73's de Edd

    Comedy Thread

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