Jumper Pins On Adcom GFP-750

stogie
stogie Posts: 230
edited February 2014 in 2 Channel Audio
I just picked up a GFP-750 and the jumper pins for the balanced outputs are missing. Can anyone advise on what gauge wire can be used for the pins? According to the manual to use the units unbalanced CD outs, pins 1 and 3 need to be shorted. Thanks
Speakers: Polk SDA-SRS xovers rebuilt by David, RDO194's, Dynamat, BH5, glued magnets, new cloth, custom aluminum terminal plates with Cardas posts and Speakon interconnect
Speaker Cables, Jumpers & Interconnect: DIY Douglas Connection
Power Amp: Sunfire Architect's Choice Series II
Preamp: Adcom GFP-750
SACD/CD: Oppo BDP-95
Tuner: Sansui TU-717
TT: Technics SL-MA1
Phono Pre: Emotiva XPS-1
Music Server: Mac Mini w/JRiver - iPad w/JRemote
DAC: Eastern Electric MiniMax Plus
Other Polks: SDA: 1A, 1C, 2B, CRS+ / Monitor: 10A, 5jr, 4 / RT5
Post edited by stogie on
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Comments

  • pitdogg2
    pitdogg2 Posts: 25,442
    edited February 2014
    http://www.polkaudio.com/forums/archive/index.php/t-79528.html

    http://www.dedicatedaudio.com/inc/sdetail/5158


    Those pins are on sale at the moment^^^^^^^^^
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  • stogie
    stogie Posts: 230
    edited February 2014
    Thank you very much PD2. I tried a search earlier but could not come up with anything useful. Maybe my search terms weren't clear enough.
    Speakers: Polk SDA-SRS xovers rebuilt by David, RDO194's, Dynamat, BH5, glued magnets, new cloth, custom aluminum terminal plates with Cardas posts and Speakon interconnect
    Speaker Cables, Jumpers & Interconnect: DIY Douglas Connection
    Power Amp: Sunfire Architect's Choice Series II
    Preamp: Adcom GFP-750
    SACD/CD: Oppo BDP-95
    Tuner: Sansui TU-717
    TT: Technics SL-MA1
    Phono Pre: Emotiva XPS-1
    Music Server: Mac Mini w/JRiver - iPad w/JRemote
    DAC: Eastern Electric MiniMax Plus
    Other Polks: SDA: 1A, 1C, 2B, CRS+ / Monitor: 10A, 5jr, 4 / RT5
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  • SCompRacer
    SCompRacer Posts: 8,497
    edited February 2014
    I see you have the manual, but just in case others read this and don't. Here is a direct link to Adcom's manual. It shows the correct location of whatever jumper method you implement. The Cardas jumpers pittdog linked to are nice and not too expensive. Wire size, not sure. Maybe 12 gauge? 12 gauge is like .080, XLR pin is ~.090.

    www.adcom-usa.com/userguides/gfp-750-ug.pdf

    The page from the manual.

    adcomjump.jpg
    Salk SoundScape 8's * Audio Research Reference 3 * Bottlehead Eros Phono * Park's Audio Budgie SUT * Krell KSA-250 * Harmonic Technology Pro 9+ * Signature Series Sonore Music Server w/Deux PS * Roon * Gustard R26 DAC / Singxer SU-6 DDC * Heavy Plinth Lenco L75 Idler Drive * AA MG-1 Linear Air Bearing Arm * AT33PTG/II & Denon 103R * Richard Gray 600S * NHT B-12d subs * GIK Acoustic Treatments * Sennheiser HD650 *
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  • eeagle
    eeagle Posts: 226
    edited February 2014
    Enjoy the Adcom GFP-750 Preamp...it is a classic, and a great performer.

    I use the XLR interconnects, but for short runs I think there is little noticeable difference.
    SDA SRS 1.2
    Adcom GFA-5802
    Adcom GFP-750
    Sony DVP-NS999ES
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  • VCoak
    VCoak Posts: 200
    edited February 2014
    I own the same pre, what does happen if there is no pin?? My pre has them and I never ran XLR before.
    W4S SX-1000, Adcom gfp-750, Polk 1.2tl, W4S DAC 2 DSDse, 2012 mac mini (mod), JRivers ver. 19, WD Cloud NAS 2 t.b., Monster Cable AVS-2000 signature, Doug's Alpha I/C & Doug's biwire 6' speaker cables
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  • SCompRacer
    SCompRacer Posts: 8,497
    edited February 2014
    VCoak wrote: »
    I own the same pre, what does happen if there is no pin?? My pre has them and I never ran XLR before.

    From the link pittdog posted in reply # 2....post # 12 in that linked CP thread.

    "Using without the jumpers in place will likely mean that the source component will see a lower input impedance than it would otherwise."

    GV#27 handle is now FTGV. Very smart fellow. When I am stumped, I ask Fred. :)
    Salk SoundScape 8's * Audio Research Reference 3 * Bottlehead Eros Phono * Park's Audio Budgie SUT * Krell KSA-250 * Harmonic Technology Pro 9+ * Signature Series Sonore Music Server w/Deux PS * Roon * Gustard R26 DAC / Singxer SU-6 DDC * Heavy Plinth Lenco L75 Idler Drive * AA MG-1 Linear Air Bearing Arm * AT33PTG/II & Denon 103R * Richard Gray 600S * NHT B-12d subs * GIK Acoustic Treatments * Sennheiser HD650 *
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  • VCoak
    VCoak Posts: 200
    edited February 2014
    Copy, headed to reply 2 post 12. thx
    W4S SX-1000, Adcom gfp-750, Polk 1.2tl, W4S DAC 2 DSDse, 2012 mac mini (mod), JRivers ver. 19, WD Cloud NAS 2 t.b., Monster Cable AVS-2000 signature, Doug's Alpha I/C & Doug's biwire 6' speaker cables
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  • CoolJazz
    CoolJazz Posts: 570
    edited February 2014
    SCompRacer wrote: »
    From the link pittdog posted in reply # 2....post # 12 in that linked CP thread.

    "Using without the jumpers in place will likely mean that the source component will see a lower input impedance than it would otherwise."

    Actually what it means is that the low side ( - ) of the balanced input has nothing attached when lacking the shorting pin, and the high input impedance device it looking for something to amplify. And it may find radiated noise and insert it into the audio.

    Tieing it to ground simply means it's now seeing a zero input. Kind of a cleanliness issue. Might, maybe, in some cases lower noise floor in other words.

    CJ
    A so called science type proudly says... "I do realize that I would fool myself all the time, about listening conclusions and many other observations, if I did listen before buying. That’s why I don’t, I bought all of my current gear based on technical parameters alone, such as specs and measurements."

    More amazing Internet Science Pink Panther wisdom..."My DAC has since been upgraded from Mark Levinson to Topping."
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