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a-9

  1. R

    A-9 for Magneplanars?

    So I've nearly collected the entire communication series of components, I love the champagne and I adore the design. I want to have it be my central setup in my home so I can have it displayed as well as having it be functional. I know theres higher end stuff but I like the communication series...
  2. Ftlbs

    A-9 Volume ctrl assy needed

    I'm looking for a part number GWX-583 volume control assembly for my 1981 A-9 Amp. I've had it since new and it recently quit on me. I also have the entire collection of that series, but my CT-9R of course died and nobody can seem to repair it. Thanks in advance for any tips.
    • Ftlbs
    • Thread
    • a-9 gwx-583 volume control volume control assembly
    • Replies: 0
    • Forum: Pioneer Audio
  3. C

    Sansui A-9 Classique A-900

    Hi! I’m new here and to repairing audio equipment. I recently acquired what is labeled a Sansui Classique A-900 amplifier. The service manual did not match the unit. However, my unit seems to match the A-9 model. Does anyone know the story behind this? Thanks!
  4. Tangerine

    Pioneer A-9 - Goes into protection all the time, with loud pops in speakers

    Hello all. Hope you've been keeping well and that you and yours are safe. :) Problem Well last time I was here I was getting this A-9 beast back up and running, and running quite well these past couple of years, with one minor issue. That being the machine randomly going into protection (the...
    • Tangerine
    • Thread
    • a-9 diagnosis faulty pioneer protection circuit
    • Replies: 2
    • Forum: Pioneer Audio
  5. QSilver

    Pioneer A-9 Biasing instructions wrong?

    I'm going through the procedures for setting this bias on an A-9 and having some trouble. Some history: I got it as a non working piece some months back and found it had many poor repairs in the all the regulator boards. I've now been right through the whole amplifier and slowly and surely...
  6. Tangerine

    ASR-068 Protection Circuit relays

    Hello all. These 48vdc relays are used to drop the output of the Driver Amps from reaching connected speakers during a fault condition. The two in my A-9 operate, i.e. armature operates but no output to speaker connections. Now these are not available under there Pioneer nomenclature, and a...
  7. Tangerine

    Pioneer A-9 in parasatic oscillation after repair - HELP!

    I've already posted this under my blog that covers the re-build of the A-9: Having fitted the new transistors: 2SA1295 2SC3264 to the (GWX-593/4) Driver Assemblies (that's a post on its own) and recapping the (GWH-148) Power Amp Assembly we now have parasitic oscillation (PO) present running RF...
  8. Tangerine

    Pioneer A-9 service manual - looking for owner of original full manual

    Hello all, All versions I have come across out there are missing the second panel of section 7 "Boards Connection Diagram" of the manual, grids 4-6. I have 1-3, 7-9 and 10-12. Typically the whole drawing has red coloured interconnects. If anyone who has the original manual could photo copy in...
  9. Tangerine

    A9 - A7: circuit board comparison

    Hello all. Looking to find out if anyone has done the analysis to determine the compatibility of A-7 boards for use in an A-9. I'm thinking that the input, EQ, switching boards could be a one for one swap. Regulator boards not so much but depending on rail voltages used. Any thoughts and...
  10. Tangerine

    Pioneer A-9 ASR-027 (RL3 reed relay) - in need of substitution sources

    Hello all! In another thread I'm documenting the re-birth of my A-9 integrated amplifier. To date RL3, which sits on the Pwr Amp assembly needs to be replaced. It's an axial six pin device with two sets of contacts that sits on the collector of Q40. It's Pioneer part number is ASR-027 and it...
    • Tangerine
    • Thread
    • a-9 asr-027 l23 pioneer reed relay rl3
    • Replies: 2
    • Forum: DIY
  11. Tangerine

    Pioneer A-9: Rebirth...more like a heart/lung transplant w/- kidney failure

    Hello all. This thread will be documenting that path to getting my A-9 back up an running. I bought it a few years ago, it was not running and I assumed an easy repair was needed. It's remained in storage in a sub-tropical environment in Sth East Queensland, Australia (this fact has weight...
  12. QSilver

    Pioneer A-8 hot transformer and humming.

    I got one of these a few months ago but only just got into using it this week but I've noticed that the transformer does hum noticeably and gets quite hot. Even when idling. Is this anything to worry about? The hum is from the transformer itself rather than the amp.
    • QSilver
    • Thread
    • 50hz a-8 a-9 ac hum hot hum humming mains hum pioneer transformer
    • Replies: 93
    • Forum: Solid State
  13. PIONEER A-Line Series Components

    PIONEER A-Line Series Components

    In 1980 PIONEER offered up the A-Line Series.Although the units in this series were well built,some incorporated silver painted plastic panels,faceplates and knobs and marked the beginning of the plastic era.In which all big manufactures headed towards. The above photo is not of the complete...
    • madpioneer
    • Media item
    • a-9 a-line ct-9r f-9 sg-9
    • Comments: 0
    • Category: Pioneer Gallery
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