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  1. 73's de Edd

    HELP please OTL tube headphone amp (again)

    Sir Ian Mason . . . . . The top relates to your pot terminals identifications related to circuitry connections. The adding of the bottom pot is a procedure for establishing a phantom variable adjustable center tap on that 6.3 filament winding and thus balancing out the two potential phases...
  2. 73's de Edd

    Need to replace odd value capacitor

    A l l l l of the ducks all lined up in a l...o...n....g row . . . . . with some at 180 ufd and some at > 200 or 220ufd. https://www.ebay.com/sch/i.html?ul_noapp=true&_nkw=photoflash+capacitor&_pgn=2&_skc=50&rt=nc Minimally . . .. it can reference you to a brand and spec . . .even if you...
  3. 73's de Edd

    Help finding fault with old bass amp that blows fuses

    Sir permanentrecordingstudios . . . . . So can I temporarily wire light bulbs in place of the fuses to absorb the excess current draws without damaging anything? Yep, you can watch the brightness increase exactly at fault time considering that you are CONTINUALLY observing them until exact...
  4. 73's de Edd

    clicking from main board on a panasonic TX-42AS650B smart tv

    Sir Richard Gray . . . . . . QUESTION . . .? dependent upon your visual inspection in looking at your final 3rd photo, with the images closeup limitation. That appears to be spider webbing build up on the best amassed clump of it. In the black areas one would immediately associate that with...
  5. 73's de Edd

    Help finding fault with old bass amp that blows fuses

    Did you even read post 3 ???? That was the derivation of the condensed schema in #3. The lamp not going to help on isolating your sporadic and particular type of situation. 73's de Edd
  6. 73's de Edd

    HELP please OTL tube headphone amp (again)

    I'll still bet you want to know as fast as is possible, so go over to the 47 K volume pot on a channel and solder a short jumper wire between the center tab of the control pot and its ground tam. BAMMMMMMM . . . . grounding accomplished on those voltage void connections and not even getting...
  7. 73's de Edd

    Air Pump

    Sir Steve 87 . . . . Go 2 inches out from the PCB and cut 1 of the the brown wire PAIR, go 2 inches further down and cut the other wire . . .so that the cuts then will be staggered on re splicing -soldering and taping. With a soldering and heat shrink tubing being the most preferred...
  8. 73's de Edd

    Tv repair

    is it possible that the IC1001 is the problem? I certainly hope NOT . Q753 has to have a minimum of 700 mv + of base drive from pin 32 of IC 801 . . .check that out.
  9. 73's de Edd

    Help finding fault with old bass amp that blows fuses

    Sir permanentrecordstudios . . . . . Submitted herewith . . . is a better all encompassing referencing of the most concerned aspects of your unit . We can see that . . . . THE . . . . real power sucking portion of your unit are the AF output transistors in the form of that complementary /...
  10. 73's de Edd

    HELP please OTL tube headphone amp (again)

    Aside . . . . . Its been so o o o o o o o long since I have had a 6080 in my hands . . . .circa 52 years . . . that I even forget a normal orange glow from them . BUT . . . that top view of the 6SN7 has its filamants appearing to be impinging on up towards the incandescance threshold.
  11. 73's de Edd

    Tv repair

    Sir thom . . . . . THAT is because it is a switchable regulator, it has to have an activation voltage on its pin 4 from pin 17 of the IC 1001 uP in order for it to switch on and put out its supply voltage. . Confirm if you have a +5 vdc at pin 22 of the uP for its power. Additionally . . .do...
  12. 73's de Edd

    Tv repair

    Sir thom . . . . . Does the indicator LED on the front of the set respond to your pressing the on off switch. Check the hoz driver transformer T603 pins 1 or 3 and tell us its DC supply level. If DC is present there, move to its secondary pin 4 and using pin 2 as ground referencing for...
  13. 73's de Edd

    Harman kardon hk395 help

    Sir Mr.fix it_101 . . . . There is a WHOLE lot that you are not showing or telling about that connector. As it is supposed to connect to a plug and ribbon connector as is dshown in the YELLOW area and then the ribbon cable routes up the RED dot path of the second pic . . .WHERE . . . there is...
  14. 73's de Edd

    HELP please OTL tube headphone amp (again)

    Sir Ian Mason . . . I don't think that I ever saw that you ever performed a good and proper job on connecting up the center of the chassis filament connections. Your very first photo confirms to me that you have properly identified pins numbers 7 and 8. The filament connections on the tube...
  15. 73's de Edd

    How much power needs to light up the LEDs?

    Sir pandadnap . . . . . Look at the CN1 connector vewy-vewy closely and observe its pin 1 connection, that receives the + terminal of a 9V battery. The Pin 2 connection goes to the batteries - terminal. That will then be giving you the prescribed operational / brightness parameters that Sony...
  16. 73's de Edd

    Old Resistors

    Sir David Adonias . . . . Got electricity back yet ? in order to run / repair that thing. AND do you DO fully recognize, that you have got yourself a early 70'ish Wurlitzer organ amplifier ? Also near the right ORANGE drop capacitor . . . . don't you have a whole scheiss-pot full of...
  17. 73's de Edd

    Comedy Thread

  18. 73's de Edd

    Old Resistors

    Sir David Adonias . . . REFERENCING TO: https://www.allaboutcircuits.com/textbook/reference/chpt-2/resistor-color-codes/ You have yourself their specified category 2 code, so enjoy all of that 2.7 ohms. Looks to be about 1 watt . . . considering no side referencing to a coin or actual...
  19. 73's de Edd

    Southwest Technical Products Corporation

    Sir alfa88 . . . . . Courtesy of Daniel Meyers Assemble a Modular Digital Measurement Lab . . . with its Plug Ins for 20Mhz Frequency Counter http://www.swtpc.com/mholley/PopularElectronics/Nov1970/PE_Nov_1970_pg51.jpg...
  20. 73's de Edd

    Transistors

    Sir bill999 . . . . If being TR6 and 7, that's being about half way down your daisy chained audio flow path, from origin at far left to the output into the headphones at far right. Do you have any electronics " junque " that we can scavenge for its transistors, as just about ANY common...
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