Dug out the SX-780...

steveinazsteveinaz Posts: 18,807
edited January 5 in 2 Channel Audio
Getting ready to put this 'ol girl back to work in my shop. Cracked the lid to blow it out a bit and have a look at the caps (Nicholson) which all looked good. This SX-780 was built in 1980 (Japan). Gonna replace the lamps while the lid is off, they all work, but I figure I'll do it now as they are original and easy to replace. I also need to de-ox the balance pot.

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Source: Bluesound Node 2i | Preamp/DAC: PS Audio Stellar Gain Cell | Power Amp: Parasound Halo A21 | Speakers: PSB Imagine T2 | Cables: Kimber Hero XLR; Kimber 8VS Bi-Wire; DH Labs D-75 Dig Coax | AC Power: Panamax M5300-PM
Post edited by steveinaz on
«1

Comments

  • verbverb Posts: 5,092
    Nice looking unit Steve! It looks minty!
    Basement: Polk SDA SRS, Rega RP1 TT, VTL 2.5 Preamplifier, Enlightened Audio Designs CD Transport, Northstar Designs DAC, Conrad Johnson MF2300A Amp, Furman 15PFi Power Conditioner, Wireworld Oasis 8 RCA IC's, MIT Terminator2 Bi-Wire speaker cables
    Office: PC, Marantz CD-1 transport, Marantz AMP-1, Acoustic Technologies Classic Speakers, SVS SB12 Plus Subwoofer, MIT AVt2 speaker cables, IFI Purifier2, AQ Cinnamon USB cable
    Spare Room: Dayens Ampino Integrated, Tjoeb 99 tube CD player (modified Marantz CD-38), Project BoxE Bluetooth Streamer, Polk TSi200's
    Living Room: Pioneer SX-N30 Network Receiver, Pioneer PD10AE CD Player, Furman M8-LX Power Conditioner, Polk RT265 In Wall Speakers, Polk DSW Pro 660wi Subwoofer
  • oldrockeroldrocker Posts: 2,073
    Nice.

    Mine is on a shelf for now.

    Delivers a great sound with my DM4's.
  • steveinazsteveinaz Posts: 18,807
    edited January 5
    It's an interesting story. Let me bore you with the details. Back in 1980, my best friend (Rob) and & I went to an audio "super sale" at the Checkerdome in STL. We both bought SX-780's and I also bought a Pioneer CTF-500 cassette deck. Fast forward to several years ago, I was able to make contact with Rob. My SX was long gone, but he still had his, which had been stored for over a decade. He sent me his, gratis, when he found out I was doing a 70's themed man cave. It IS mint, and I at least got him to agree to let me pay for the shipping. I had to agree to never sell it, and I did so willingly. So here she is!

    Tell you what, this thing is HEAVY. Nothing like receivers today. I'd bet it's near 20lbs.

    At the other house, in that HUGE RV garage, I had the 780 hooked up to a pair of ENERGY C-9 towers, and that SX could FILL that area (2500 sq ft) at incredible volumes thru those C-9's.
    Source: Bluesound Node 2i | Preamp/DAC: PS Audio Stellar Gain Cell | Power Amp: Parasound Halo A21 | Speakers: PSB Imagine T2 | Cables: Kimber Hero XLR; Kimber 8VS Bi-Wire; DH Labs D-75 Dig Coax | AC Power: Panamax M5300-PM
  • EndersShadowEndersShadow Posts: 16,397
    edited January 5
    oldrocker wrote: »
    Nice.

    Mine is on a shelf for now.

    Delivers a great sound with my DM4's.

    Gotta say I’d love to hear that pairing!
    "....not everything that can be counted counts, and not everything that counts can be counted." William Bruce Cameron, Informal Sociology: A Casual Introduction to Sociological Thinking (1963)
  • DaveHoDaveHo Posts: 2,146
    Sweet looking gear. They don't make them that pretty any more.
  • verbverb Posts: 5,092
    steveinaz wrote: »
    It's an interesting story. Let me bore you with the details. Back in 1980, my best friend (Rob) and & I went to an audio "super sale" at the Checkerdome in STL. We both bought SX-780's and I also bought a Pioneer CTF-500 cassette deck. Fast forward to several years ago, I was able to make contact with Rob. My SX was long gone, but he still had his, which had been stored for over a decade. He sent me his, gratis, when he found out I was doing a 70's themed man cave. It IS mint, and I at least got him to agree to let me pay for the shipping. I had to agree to never sell it, and I did so willingly. So here she is!

    Tell you what, this thing is HEAVY. Nothing like receivers today. I'd bet it's near 20lbs.

    At the other house, in that HUGE RV garage, I had the 780 hooked up to a pair of ENERGY C-9 towers, and that SX could FILL that area (2500 sq ft) at incredible volumes thru those C-9's.

    Not to thread jack, but I worked at the Checkerdome at that time (not that show, mainly Blues games and concerts) while I was in college! St Louis University! Small world indeed! :smile:
    Basement: Polk SDA SRS, Rega RP1 TT, VTL 2.5 Preamplifier, Enlightened Audio Designs CD Transport, Northstar Designs DAC, Conrad Johnson MF2300A Amp, Furman 15PFi Power Conditioner, Wireworld Oasis 8 RCA IC's, MIT Terminator2 Bi-Wire speaker cables
    Office: PC, Marantz CD-1 transport, Marantz AMP-1, Acoustic Technologies Classic Speakers, SVS SB12 Plus Subwoofer, MIT AVt2 speaker cables, IFI Purifier2, AQ Cinnamon USB cable
    Spare Room: Dayens Ampino Integrated, Tjoeb 99 tube CD player (modified Marantz CD-38), Project BoxE Bluetooth Streamer, Polk TSi200's
    Living Room: Pioneer SX-N30 Network Receiver, Pioneer PD10AE CD Player, Furman M8-LX Power Conditioner, Polk RT265 In Wall Speakers, Polk DSW Pro 660wi Subwoofer
  • steveinazsteveinaz Posts: 18,807
    Sweet! Once a year they would have model year-end super sales at the Checkerdome. I remember seeing a Pair of HPM 100's that had acrylic see-thru cabinets--awesome.

    I need to make a correction: Nichicon capacitors.
    Source: Bluesound Node 2i | Preamp/DAC: PS Audio Stellar Gain Cell | Power Amp: Parasound Halo A21 | Speakers: PSB Imagine T2 | Cables: Kimber Hero XLR; Kimber 8VS Bi-Wire; DH Labs D-75 Dig Coax | AC Power: Panamax M5300-PM
  • rooftop59rooftop59 Posts: 5,151
    I was 2 in 1980.

    Sweet reciever!
    HT Rig:
    Denon AVR-X4200w; Peachtree Audio NovaPre; B&K TX4430; Bryson BPD-1; Mains: Dynaudio Emit 10; Center - Polk cs400i; Heights, Center Surround - Klipsch KHC - 6 In-Ceiling; Surrounds - Monoprice in-ceiling; Sub - HSU VTF-2 MK5; LG UP870 4K BDP; NVidia ShieldTV
    ;
    Master Bedroom
    Marantz SR-5007; Parasound HCA-1000A, PSB Imagine B, NHT Super One CI surrounds, Martin Logan Dynamo (original), Squeezebox Touch
  • oldrockeroldrocker Posts: 2,073
    oldrocker wrote: »
    Nice.

    Mine is on a shelf for now.

    Delivers a great sound with my DM4's.

    Gotta say I’d love to hear that pairing!

    Funny you say that.
    When I came to your GTG with the DM4's I almost brought it with me.

    Don't know what it is about those 2 pieces but they really work well together.



  • honestaquarianhonestaquarian Posts: 2,261
    What's the power output per channel on this beast?
    I remember those days well. Most of the receivers looked like this one back then, with some notable exceptions like Sansui. These boat anchors were durable and sounded good.
    Living room Home theater: Upgrade Company modified Onkyo PR-SC5509,Sunfire Cinema grand Signature 5 channel amp(1st gen),Carver TFM-45,Carver M-400a,Panasonic TC-P50ST60 50" Plasma(last gen before Plasma production stopped)Pioneer Elite DVL-91,Meridian 519 Dolby AC-3 RF Demodulator,Oppo Digital UDP-205,TiVo Bolt VOX,Nakamich BX-300,Technics SL-1200MKII,Shure V15 Type VxMR cartridge,Polk SDA-SRS 3.1 TL(with RD-0198 tweeters, upgraded with Larry's rings, black hole5,an Avel-Lindberg 1000VA isolation transformer, VR3 customer crossovers and internal wiring),Polk CS-1000P(with SL-6506 tweeter),Polk Monitor 5jr(with RD-0194 tweeters),Polk RT-35i (1),Polk Mini Monitors,Polk PSW150(4)Monster Power HTPS 7000 MKII Signature series,Monster Power AVS 2000 Signature Series,Various MIT,Monster,Upgrade Company and Belden interconnect,power,HDMI,Coax and Toslink Digital and speaker cables.

    Bedroom 2 channel system:Integra DTM 40.4,Nakamichi BX-100,TiVo mini,Musical Fidelity X-LPS,X-PSU,Carver TFM-25,Sony KV-34XBR970(last of the widescreen tube sets before production stopped)Technics SL-1200MKII,Shure V15 Type V MR cartridge,Polk RT-55(with SL-6506 tweeters),Polk PSW-200 in plexiglass(2),Sony Playstation 3 slim.Monster Power HTPS-7000,Monster AVS-2000, PowerVarious Kimber,Audioquest and MIT interconnects and speaker cables.
  • honestaquarianhonestaquarian Posts: 2,261
    Oh wait I see it on the meters in the close up pic. 50 wpc
    Living room Home theater: Upgrade Company modified Onkyo PR-SC5509,Sunfire Cinema grand Signature 5 channel amp(1st gen),Carver TFM-45,Carver M-400a,Panasonic TC-P50ST60 50" Plasma(last gen before Plasma production stopped)Pioneer Elite DVL-91,Meridian 519 Dolby AC-3 RF Demodulator,Oppo Digital UDP-205,TiVo Bolt VOX,Nakamich BX-300,Technics SL-1200MKII,Shure V15 Type VxMR cartridge,Polk SDA-SRS 3.1 TL(with RD-0198 tweeters, upgraded with Larry's rings, black hole5,an Avel-Lindberg 1000VA isolation transformer, VR3 customer crossovers and internal wiring),Polk CS-1000P(with SL-6506 tweeter),Polk Monitor 5jr(with RD-0194 tweeters),Polk RT-35i (1),Polk Mini Monitors,Polk PSW150(4)Monster Power HTPS 7000 MKII Signature series,Monster Power AVS 2000 Signature Series,Various MIT,Monster,Upgrade Company and Belden interconnect,power,HDMI,Coax and Toslink Digital and speaker cables.

    Bedroom 2 channel system:Integra DTM 40.4,Nakamichi BX-100,TiVo mini,Musical Fidelity X-LPS,X-PSU,Carver TFM-25,Sony KV-34XBR970(last of the widescreen tube sets before production stopped)Technics SL-1200MKII,Shure V15 Type V MR cartridge,Polk RT-55(with SL-6506 tweeters),Polk PSW-200 in plexiglass(2),Sony Playstation 3 slim.Monster Power HTPS-7000,Monster AVS-2000, PowerVarious Kimber,Audioquest and MIT interconnects and speaker cables.
  • oldrockeroldrocker Posts: 2,073
    Need to pull her off the shelf.

    ybgbwt19q5ar.jpg
  • EndersShadowEndersShadow Posts: 16,397
    oldrocker wrote: »
    oldrocker wrote: »
    Nice.

    Mine is on a shelf for now.

    Delivers a great sound with my DM4's.

    Gotta say I’d love to hear that pairing!

    Funny you say that.
    When I came to your GTG with the DM4's I almost brought it with me.

    Don't know what it is about those 2 pieces but they really work well together

    Next time for sure!
    "....not everything that can be counted counts, and not everything that counts can be counted." William Bruce Cameron, Informal Sociology: A Casual Introduction to Sociological Thinking (1963)
  • mhardy6647mhardy6647 Posts: 20,981
    rooftop59 wrote: »
    I was 2 in 1980.

    Sweet reciever!

    I graduated from freaking college in 1980...

    Nice lookin' SX-780 :)

  • mhardy6647mhardy6647 Posts: 20,981
    From the SX-780 manual
    source: http://www.kallhovde.com/pioneer/sx-780om.pdf

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  • steveinazsteveinaz Posts: 18,807
    What have you fellow SX owners used for replacement lamps (faceplate illumination)?
    Source: Bluesound Node 2i | Preamp/DAC: PS Audio Stellar Gain Cell | Power Amp: Parasound Halo A21 | Speakers: PSB Imagine T2 | Cables: Kimber Hero XLR; Kimber 8VS Bi-Wire; DH Labs D-75 Dig Coax | AC Power: Panamax M5300-PM
  • oldrockeroldrocker Posts: 2,073
    Haven't replaced mine. They all still work...
  • joecoulsonjoecoulson Posts: 2,079
    I was 5 in 1980 and full o beans
    Sweet looking receiver for sure. Love 70’s and 80’s gear. They looks so pretty compared to today’s gear.
    2ch: PS Audio Stellar Gain pre, 4 x Linn LK240 monoblocks ( bi-amping) Elac Adante AF-61's, SVS SB16 Ultra Subwoofer, Cambridge Audio CXN v2, Rega Planar 2 with Canaro 2 subplatter, dual belt pulley and upgraded bearing, Rega Ania MC cart, Vincent PHO 701 Phono pre with Mullard NOS 12au7, Audioquest Niagara 1000, AQ Thunder, AQ red river XLR's and Victoria IC's, Wireworld Stratus and Aurora power cables, Atlas EOS power cable, Denon 2910 (as transport) Sony CPD355 Jukebox cd

    5.1: Marantz sr5003 (feeding mains through HT bypass) Sonus Faber solo center, AQ Carbon HDMI's, Sony XBRx900E, Xbox One S as 4k player, Definitive Technology SM350's surrounds, Tivo Bolt, Harmony Elite remote

    Other gear: Totem Rainmakers (not hooked up) Sonos play 5 and play 1's x 2, Audio Technica TT and Edifier active speakers in kids room, JVC XM448 minidisc rack mount, Sony minidisc walkman, Project Debut III (currently not working), Samsung 46, and 2 x32" tvs, Samsung Soundbar, Okki Nokki LP cleaner, Second Harmony remote setup for bedroom, etc etc
  • joecoulsonjoecoulson Posts: 2,079
    Omg. That’s insane Mark!! Lol
    2ch: PS Audio Stellar Gain pre, 4 x Linn LK240 monoblocks ( bi-amping) Elac Adante AF-61's, SVS SB16 Ultra Subwoofer, Cambridge Audio CXN v2, Rega Planar 2 with Canaro 2 subplatter, dual belt pulley and upgraded bearing, Rega Ania MC cart, Vincent PHO 701 Phono pre with Mullard NOS 12au7, Audioquest Niagara 1000, AQ Thunder, AQ red river XLR's and Victoria IC's, Wireworld Stratus and Aurora power cables, Atlas EOS power cable, Denon 2910 (as transport) Sony CPD355 Jukebox cd

    5.1: Marantz sr5003 (feeding mains through HT bypass) Sonus Faber solo center, AQ Carbon HDMI's, Sony XBRx900E, Xbox One S as 4k player, Definitive Technology SM350's surrounds, Tivo Bolt, Harmony Elite remote

    Other gear: Totem Rainmakers (not hooked up) Sonos play 5 and play 1's x 2, Audio Technica TT and Edifier active speakers in kids room, JVC XM448 minidisc rack mount, Sony minidisc walkman, Project Debut III (currently not working), Samsung 46, and 2 x32" tvs, Samsung Soundbar, Okki Nokki LP cleaner, Second Harmony remote setup for bedroom, etc etc
  • mhardy6647mhardy6647 Posts: 20,981
    That's just the rack with the most seventies-era stuff on it (you'll notice a few imposters).
  • steveinazsteveinaz Posts: 18,807
    I think I spy some Fischer or Scott tuners in that stack.
    Source: Bluesound Node 2i | Preamp/DAC: PS Audio Stellar Gain Cell | Power Amp: Parasound Halo A21 | Speakers: PSB Imagine T2 | Cables: Kimber Hero XLR; Kimber 8VS Bi-Wire; DH Labs D-75 Dig Coax | AC Power: Panamax M5300-PM
  • mhardy6647mhardy6647 Posts: 20,981
    Those be Sherwoods, young man.
    The Fishers and Scotts live on another shelf.

    All three brands were/are very good, but the sound quality of Sherwoods per dollar (on today's market) is, in my characteristically unhumble opinion, exemplary.

    11375465156_6aa8243414_o.jpggreat scott by Mark Hardy, on Flickr
    14815780530_d960f53533_o.jpgDSC_9821 by Mark Hardy, on Flickr
  • mhardy6647mhardy6647 Posts: 20,981
    ... but I digress.
    Sorry!

    Unfortunately, I don't know squat 'bout no SX-780 :(
  • aprazer402aprazer402 Posts: 1,296
    01hze5hpo7nu.jpg

    My SX-780 is resting at the moment, enjoyed it's sound with my older small Monitor 7's and 5 JR+'s.

    About four years ago I started using it again after several years. Low volume, easy loads. Then after about 2-3 months of maybe once weekly use, no output, powers on but nothing. Took it to the shop. Owner replaced one of two Darlington IC power packs (he said failed), less than $100.00. Okay, so now good. Take it home use it again, worked fine for about six months, then dead again. So I never took it back to the shop and that has been almost four years. Could be the other channel power pack has failed or the replacement was defective? Or something else? Unit is 9/10 otherwise.
  • mhardy6647mhardy6647 Posts: 20,981
    edited January 6
    Good quality replacement "STK" power output packs for things like the SX-780 are notoriously hard to find. Many of the parts available today, regardless of source, are reputed to be counterfeits of poor, or at best, dubious, quality :(

    It is a major bugaboo* with the late 1970s into early 1980s mass(ish) market Japanese-brand hifi hardware (receivers and integrated amplifiers), unfortunately.

    Here's some example discussion on the subject.
    http://audiokarma.org/forums/index.php?threads/is-there-any-better-new-type-stk-0050.822331
    http://audiokarma.org/forums/index.php?threads/stk-0050-replacement-for-sx-780-and-others.721181/


    _________________
    * Major Bugaboo, of course, distinguished himself in the trenches in WWI. This is a different bugaboo altogether.

  • aprazer402aprazer402 Posts: 1,296
    ^^^^ Thanks Mark. So another option could be the find a donor power pack from a used 780? Is the pack used for each channel identical or specific to L/R?
  • mhardy6647mhardy6647 Posts: 20,981
    edited January 6
    I am not 100% sure, if the STK-0050 is a mono pack, it'll use two; if it's a stereo pack, it'll use one.

    EDIT: looks to be mono:
    https://www.digchip.com/datasheets/parts/datasheet/922/STK0050-pdf.php
  • verbverb Posts: 5,092
    OMG! Professor does have an 8-track player! Don’t get me started, again! :smile:
    Basement: Polk SDA SRS, Rega RP1 TT, VTL 2.5 Preamplifier, Enlightened Audio Designs CD Transport, Northstar Designs DAC, Conrad Johnson MF2300A Amp, Furman 15PFi Power Conditioner, Wireworld Oasis 8 RCA IC's, MIT Terminator2 Bi-Wire speaker cables
    Office: PC, Marantz CD-1 transport, Marantz AMP-1, Acoustic Technologies Classic Speakers, SVS SB12 Plus Subwoofer, MIT AVt2 speaker cables, IFI Purifier2, AQ Cinnamon USB cable
    Spare Room: Dayens Ampino Integrated, Tjoeb 99 tube CD player (modified Marantz CD-38), Project BoxE Bluetooth Streamer, Polk TSi200's
    Living Room: Pioneer SX-N30 Network Receiver, Pioneer PD10AE CD Player, Furman M8-LX Power Conditioner, Polk RT265 In Wall Speakers, Polk DSW Pro 660wi Subwoofer
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