Recent content by Vegemite

  1. Vegemite

    Dynaudio Emit 20!

    I guarantee that this has nothing to do with the speakers. Talk to an AV specialist.
  2. Vegemite

    TDA1541A-R1 & SAA7220P/A DIY DAC from CHINA

    You'll have to excuse my lack of knowledge on DACs - I know the basic functions only I think its the TDA1315H pictured maybe? And I'm trying to figure out what will happen if I feed it 24bit audio, it looks like (from the datasheet) the TDA1315H just converts the extra depth to 0's depending on...
  3. Vegemite

    TDA1541A-R1 & SAA7220P/A DIY DAC from CHINA

    This thing actually sounds really good. Quite surprised. Now just to figure out a way to have a Rpi resample everything to it 16/44.1
  4. Vegemite

    TDA1541A-R1 & SAA7220P/A DIY DAC from CHINA

    I pulled a busted Rotel player out of my mothers place that has a 1541A in it, so I've grabbed one of these semi completed boards. Cant hurt to see how it goes. If it works it works.
  5. Vegemite

    Amp HF distortion - only with covers on?

    There was a lot of flux on the PCBs. But this did not improve or fix the oscillating condition. Caps replaced a couple days later. Problem solved. Caps were/are film.
  6. Vegemite

    Amp HF distortion - only with covers on?

    If anyone ever finds this, here's a possible solution After deep cleaning the PCBs and a crash course in electronics, specifically amplifiers, I've replaced the heatsink/rail coupling capacitors (C23 in the attached schematic) with properly spec'd 0.1uf and threw away the 0.007uF (measured)...
  7. Vegemite

    Amp HF distortion - only with covers on?

    This MOSFET AB amp - PMF2150B - measures fine with the top and bottom covers off, within the limitations of my gear anyway. (theres a small DC offset issue, 6mV one channel 40mV the other, but I'm pretty sure I can fix that by replacing the input differential transistors with better gain...
  8. Vegemite

    Yamaha MX-1 Thread

    Finally got everything back together - still 90V chassis to true ground/earth. This is enough voltage to make your eyeballs vibrate, let alone your finger hairs tingle. Rest assured this is not a mains side voltage leakage but a leakage somewhere after the secondary side of the transformers. I...
  9. Vegemite

    Yamaha MX-1 Thread

    Managed to get the transformers tested. Perfect results with insulation resistance testing @ 250V DC. Isolated them from the chassis w/nylon, earthed cases to mains grid and retested, chassis voltage down to 7V A.C. (expected). Removed the voltage selector switch to rule that out also. New...
  10. Vegemite

    Yamaha MX-1 Thread

    Thanks for reply Avionic I'm 240V here and cannot flip the plug but I can swap L-N inside the amp or plug (I'm ticketed electrician). I could just earth the chassis with a new 3c mains lead, but I'd rather keep the mains ground out of the audio circuit - as I tested the speaker negatives are...
  11. Vegemite

    Yamaha MX-1 Thread

    Picked up a 240V (selectable 120-240) Yamaha MX-1 that had been DROPPED on the ground. Paid 200 for it untested. Fortunately the chassis is so damn solid the damage only bent the corner of the front face a little, doesn't bother me. Plugged in and powered on - checked DC offset; 4.2mV RC 3.9mV...
  12. Vegemite

    KEF Q100 $229

    Anyone heard the latest Q300 vs Q350? Opinions? Looks like the main change is the relocation of the port and that's about it. I'm wondering if the rear port will limit my location options as I will have them within close proximity of a wall, say ~1.5ft. If that's the only difference I might as...
  13. Vegemite

    Rega Unvails 2017 Brio-R!

    So it's no longer the Brio-R but just Brio. I picked up one of these to set up a system in my new office. Still undecided on speakers and source but considering the LS50 for front end. Seems like the LS50 really can't be faulted. But since they are in the office they will just be plonked on a...
  14. Vegemite

    The Yamaha A-S2100

    I can't speak for the as1000, I haven't heard it. With my as2100, now powering a set of dynaudio focus 260s - I think my weak link now is the source, blue sound node 2 using node dac, but as I have it at the moment there are constantly songs on tidal making my jaw drop. I am so happy with the...
  15. Vegemite

    Schiit Modi Multibit

    Dell Inspiron 7537. Always made a weird high pitched noise when scrolling down a web page. Knew the graphics were dicey. And had a feeling it would be a problem with the modi. Wish there was a way to disable the integrated intel graphics chip, and force all graphics to display through the...
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