Recent content by LesE

  1. LesE

    sx535 parts question

    The parts database suggests that the ASC-061 Function Switch that is used in the SX-535 is unique to that model.
  2. LesE

    Pioneer SX-828 diagnostic/repair assistance needed

    Here is the schematic of the amplifier assembly showing the calculated voltage values for all of the transistor leads. Hope it helps.
  3. LesE

    help locating Pioneer A 71 service manual

    It would be interesting to know if any of the circuit board part numbers in the A-71 match the part numbers in the A-858.
  4. LesE

    help locating Pioneer A 71 service manual

    This indicates that the A-858 is the 220/240V version of the A-71. https://www.audioservicemanuals.com/p/pioneer/pioneer-a/pioneer-a-858/2456191-pioneer-a-858-service-manual The A-71 manual on eBay is likely the additional manual (KU/CA) refered to in the A-858 document and may be the only...
  5. LesE

    Spec-1 & Spec-4

    https://drive.google.com/file/d/1g8gqWbq_4mkDE3S3QHCupDc2g5656fu9/view?usp=drive_link https://drive.google.com/file/d/1U5zIhSgbs1ZFgP7oNlaBXgQDvEyWcPvW/view?usp=drive_link
  6. LesE

    Adcom GTP-750 Service Manual

    https://www.audioservicemanuals.com/a/adcom/adcom-gtp/9419936-adcom-gtp-750-service-manual
  7. LesE

    SX-980 Balance pot

    A comparison to an SX-1080 should be valid since both the SX-980 and SX-1080 use the GWG-112 Flat Amplifier Assembly with an ACV-190 balance control. Here is a photo from @RS Steve 's SX-1080 thread which shows that the shaft of the balance control is short. Here is the same SX-1080 with...
  8. LesE

    SX-1010 - no bias no offset

    You may also want to try decreasing C5 from 4.7uf to 2.2uf. This will allow the protection relay to drop a little sooner when powering down which may be sufficient to suppress the pop you are experiencing. The following shows how this change affects the relay coil current upon power down. In...
  9. LesE

    Pioneer VSX-D1S capacitor question.

    For future reference, here is a list of the capacitor types used by Pioneer. Capacitors with the "CE", "CSS" or "CSY" part number prefix as listed in the service manuals are "Aluminum Electrolytic" type.
  10. LesE

    Best Way to Connect a RG-1?

    Yes, that should be fine. Welcome to Audiokarma!
  11. LesE

    SX-1250 issue

    Here is the service manual. https://drive.google.com/file/d/1Tr2EDRlOKA8fytESnw3Kp3qjNsg2iGnW/view?usp=drivesdk
  12. LesE

    PIONEER: Serial number -> production year?

    I can say with complete certainty that the W prefix is 1976. I purchased my PL-530 new on Jan 22, 1977 and the serial number prefix is WK which has to be November 1976. I also have an SX-1250 that I purchased on May 1978 which has a serial number prefix of WH (August 1976). In this case, I...
  13. LesE

    Avid 105 speakers

    From High Fidelity November 1975
  14. LesE

    Roy Allison / RA labs speakers

    Here is an RDL Acoustics and RA Labs product brochure. Unfortunately, some of the pages are a little fuzzy. https://www.classicspeakerpages.net/library/allison/rdl_acoustics/rdl_acoustics_ra_labs_broch/
  15. LesE

    SX-880 left channel volume stays on even when turned down

    ACV-161 was also used in other models.
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