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Recent content by Massimogdf

  1. Massimogdf

    Pioneer M-90 service bulletin

    Best regards.
  2. Massimogdf

    Pioneer M-90 service bulletin

    As I wrote, on the M90 you do not have a trimmer for adjustments. Everything happens automatically, if your M90 works well, everything will be adjusted automatically.
  3. Massimogdf

    Pioneer M-90 service bulletin

    Con il Pioneer M90 non è possibile effettuare la regolazione. Tutto avviene automaticamente tramite il circuito PA0016. Cordiali saluti.
  4. Massimogdf

    Old transistors A1145/C2705 for Pioneer M90

    Thank you. How I find it?
  5. Massimogdf

    Pioneer SA 8800 restoration and recap.

    Buongiorno. Qualcuno ha mai sostituito il trasformatore in un Pioneer SA-8800? Devo montare il trasformatore acquistato, ma non ho visione del precedente e non voglio sbagliare collegando i fili colorati. Qualsiasi aiuto sarebbe utile. Grazie a tutti.
  6. Massimogdf

    Pioneer M-90 service bulletin

    This community is fantastic. I tried using the C2383y/A1013y pair as drivers instead of the original C2705/A1145 ones. The result was not good, that torque is not good in that position for the Pio M90a. I recently found the original C2705 and A1145, after installing them the sound became better...
  7. Massimogdf

    Leestereo's Marantz 1090 Restoration/Upgrade

    Thank you for your answers and your time. Yours is an important help. My 1090 only plays from the right channel, the left does not play. Everything seems to be ok, all voltages are ok, but the left channel does not sound. A strange thing happens: if I use the tape inputs and move the selector to...
  8. Massimogdf

    Leestereo's Marantz 1090 Restoration/Upgrade

    Excuse me. In the photo I circled a zener diode. The 1090 manual does not indicate the value of this zener. Does anyone know the value of this diode? Thank you
  9. Massimogdf

    Leestereo's Marantz 1090 Restoration/Upgrade

    Many thank, 1K
  10. Massimogdf

    Leestereo's Marantz 1090 Restoration/Upgrade

    Thanks for your time, I will purchase the 1K trimmers. I can't record idle currents on the left channel, no readings. By rotating the trimmer the measurement remains 0. While the right channel is playing I can feel the heat of the power transistors, only on the right side. On the left there is...
  11. Massimogdf

    Leestereo's Marantz 1090 Restoration/Upgrade

    Good morning. Sorry for asking on an old topic. Can you tell me the original value of the two trimmers (R771 e R772)? I'm working on a 1090, only the right channel works, the left channel has no sound. No regulation of idle currents. I can't understand the problem. Do you have a tip for me...
  12. Massimogdf

    Pioneer M-90 Rebuild

    Please, RY 301 and RY 302 are 12 V relay? 12V or other? Many thanks
  13. Massimogdf

    Pioneer M-90 service bulletin

    Mark good morning, your intervention is precious and I thank you. I haven't done any tests yet, my curiosity is based exclusively on the news found on AK. The A1145/C2705 pair of transistors is very fast, this could be a problem in the audio field. You also wrote something about this topic, the...
  14. Massimogdf

    Pioneer M-90 service bulletin

    Yes, I used 15,000 uf at 100V purchased from Digikey. It was a complete restoration. But even before the restoration the high frequencies were very high, the low frequencies are hardly present. This thing makes me curious, I would like to explore new ideas. Maybe using slower transistors I could...
  15. Massimogdf

    Pioneer M-90 service bulletin

    Of course what you say is right, hannessy. However the Pio M90 has been completely refurbished on the capacitors, all sourced from Digikey, Nichicon PW serie. So the capacitors are all new. In the next few days I will try this modification, I want to replace the 2 pairs of A1145/C2705 for each...
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