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  1. Schmidlapper

    Newbee Q of the Day - Pioneer SX780: I'm inputting 1,000Hz into AUX but only getting 8-10 VAC out of the speaker terminal at full volume. Now what?

    You did well and learned much along the way, the most important being that you can. Nice work.
  2. Schmidlapper

    Newbee Q of the Day - Pioneer SX780: I'm inputting 1,000Hz into AUX but only getting 8-10 VAC out of the speaker terminal at full volume. Now what?

    Ok they share the same circuit. The SX-780 has a much better service manual than the SX-790, both on HiFi Engine.
  3. Schmidlapper

    Newbee Q of the Day - Pioneer SX780: I'm inputting 1,000Hz into AUX but only getting 8-10 VAC out of the speaker terminal at full volume. Now what?

    This is a good point, also the balance circuit could be a factor alternatively. This is where a scope would be helpful.
  4. Schmidlapper

    Newbee Q of the Day - Pioneer SX780: I'm inputting 1,000Hz into AUX but only getting 8-10 VAC out of the speaker terminal at full volume. Now what?

    Ok, if you have gotten them both to null then the variance is not likely an issue, maybe an effect of the issue. The schematic shows many nominal voltages you can check, the other channel mirrors it. Continue looking for differing values from on the schematic and the good channel and write down...
  5. Schmidlapper

    Newbee Q of the Day - Pioneer SX780: I'm inputting 1,000Hz into AUX but only getting 8-10 VAC out of the speaker terminal at full volume. Now what?

    I'm looking at R237 and R238, both 36K ohms, the one side indicates a nominal value of 17.1v on the schematic, looking at the photo I am assuming that is where you are seeing the differing values you measured. When the manual has you adjust for the null, is it using VR5 and VR6? If so where do...
  6. Schmidlapper

    Newbee Q of the Day - Pioneer SX780: I'm inputting 1,000Hz into AUX but only getting 8-10 VAC out of the speaker terminal at full volume. Now what?

    If I'm transferring that pic to the schematic correctly and those voltages are set with VR5 and VR6, the voltage closest to -17.1 should be the working channel. Can you verify?
  7. Schmidlapper

    Ohhh that smell!

    Maybe you already did this, but in my ST-70 rebuild I had so many squirrely issues until I heeded the recommendation of someone on here by replacing all the old original tube sockets. The old plating was so worn, it would clean up briefly only to quickly corrode again. I had random noises...
  8. Schmidlapper

    NAD Barbecue?

    I’ve purchased eBay electronics that have came with all sorts of dead bugs inside, never saw a fried one though. Reminds me of the story on how the computing term “bug in the system” came about. Cotton swabs would be useful as well when needing to remove that much unwanted material without...
  9. Schmidlapper

    Newbee Q of the Day - Pioneer SX780: I'm inputting 1,000Hz into AUX but only getting 8-10 VAC out of the speaker terminal at full volume. Now what?

    Glad to hear your new cable has solved the input issue. It appears you have one working channel, and one degraded channel. The good news is that with one good channel you have the perfect example to compare voltage readings against.
  10. Schmidlapper

    Newbee Q of the Day - Pioneer SX780: I'm inputting 1,000Hz into AUX but only getting 8-10 VAC out of the speaker terminal at full volume. Now what?

    Thanks for that. Your phones measurement of .98 Vpp provides approx .350mV RMS, which should be more than sufficient for the SX-780 based upon manufacturer stated input sensitivity of 150 mV. I have been hoping the OP doesn't have an output power issue instead. Without knowing the actual input...
  11. Schmidlapper

    Newbee Q of the Day - Pioneer SX780: I'm inputting 1,000Hz into AUX but only getting 8-10 VAC out of the speaker terminal at full volume. Now what?

    Excellent! Where there separate adjustments for each individual meter on yours, or a common one?
  12. Schmidlapper

    Newbee Q of the Day - Pioneer SX780: I'm inputting 1,000Hz into AUX but only getting 8-10 VAC out of the speaker terminal at full volume. Now what?

    I find two details to be interesting, The first is found in the original post of the OP, and RTally later describes it well in post #44. If the output is indeed only reading between 8 to 10 volts, then mid scale on the meters would not necessarily be inaccurate. Second there are two meters...
  13. Schmidlapper

    Newbee Q of the Day - Pioneer SX780: I'm inputting 1,000Hz into AUX but only getting 8-10 VAC out of the speaker terminal at full volume. Now what?

    There is an old story about a dam that has developed a problem that no one has been able to resolve. So they call in a fellow who is considered a specialist to diagnose the dam. After a spell he presents a report showing a 75 cent part is required to correct the problem, and a bill for $2000.75...
  14. Schmidlapper

    Newbee Q of the Day - Pioneer SX780: I'm inputting 1,000Hz into AUX but only getting 8-10 VAC out of the speaker terminal at full volume. Now what?

    i spoke to the load quite plainly in my prior posts, but maybe you weren't commenting to me specifically. The OP doesn't delve much into their set up or procedures.
  15. Schmidlapper

    Newbee Q of the Day - Pioneer SX780: I'm inputting 1,000Hz into AUX but only getting 8-10 VAC out of the speaker terminal at full volume. Now what?

    According to the SX-790 users manual available on Hifiengine, a 150mV, 1KHz signal into the Aux should be sufficient to drive the amp to ~45Watts or ~19Vrms @ .05% THD into a 8 ohm load, w/ both channels driven. Volume control should be adjusted to ~max. 150mV is quite modest, so an iphone...
  16. Schmidlapper

    Newbee Q of the Day - Pioneer SX780: I'm inputting 1,000Hz into AUX but only getting 8-10 VAC out of the speaker terminal at full volume. Now what?

    The listing of basic test equipment necessary to measure the output of an audio amp correctly, probably is overwhelming to most people. It is fortunate that I didn't touch upon procedures, as I hate to think what it might have sparked. ; ) I do not begrudge any person trying to do what they...
  17. Schmidlapper

    Newbee Q of the Day - Pioneer SX780: I'm inputting 1,000Hz into AUX but only getting 8-10 VAC out of the speaker terminal at full volume. Now what?

    You have verification the amp is outputting a random level of audio signal, a form of go, no go test. To accurately measure the amps output you will need to know the input sensitivity of your amp, which is the required input voltage, typically at 1KHz, necessary to develop the full rated output...
  18. Schmidlapper

    MONSTER AMP Modifying

    A 24 volt circuit discussion, https://www.diyaudio.com/community/threads/2-speed-fan-controller.178333/ you can look at.
  19. Schmidlapper

    MONSTER AMP Modifying

    I googled this, it might meet your needs. https://www.instructables.com/How-to-Make-a-Simple-Temperature-Control-Fan-Speed/
  20. Schmidlapper

    FYI the Schiit Saga S has gone missing?

    Too complex, a simple RCA switch provides me the one extra RCA jack I needed. To be honest Schiit did me a favor, the WiiM is actually a better, simpler solution for me now, and a $19 switch is a lot cheaper.
  21. Schmidlapper

    FYI the Schiit Saga S has gone missing?

    Kara is also a larger chassis size. Schiit offers three rather unusual chassis sizes, I would have liked to stick with the one I had settled on with buying the Modius. For my part, I will continue using the WiiM Pro as a solution, it actually has some benefits over the Saga S, such as PEQ for...
  22. Schmidlapper

    FYI the Schiit Saga S has gone missing?

    Since November I've been watching and waiting for Schiit to restock black versions of the Saga S preamp. I eventually wrote Schiit and asked them, but was told they couldn’t comment on such matter. Today I checked their website and the Saga S is now gone all together. The Saga S was the perfect...
  23. Schmidlapper

    Realistic Nova 8b Rebuild & Crossover Re-Design

    The amplified source signal, from say a CD player or turntable for example, is what causes the speaker movements. There will be many frequencies all at once affecting the speaker, all falling somewhere between 20 Hz and 20 KHz typically. An AC or DC power source in theory makes no difference at...
  24. Schmidlapper

    Realistic Nova 8b Rebuild & Crossover Re-Design

    Speakers are transducers, and for consumer audio purposes function from an amplified alternating source signal. Automobile amplifiers, or many portable audio players for example typically operate off of DC batteries, there would be no 60 Hz AC involved in those cases and the speakers function...
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