ADCOM GFP-750 Blue Boards

Toolfan66
Toolfan66 Posts: 17,244
edited August 2010 in 2 Channel Audio
Really does anybody know what the difference is other then the color?

My board is the Blue Board. This is a pic of mine

ADCOMBLUEBOARD.jpg

Here is another board looks blue to me the Adcom logo is there and bigger,
But I am guessing this is a red board.. this is a pic of one on ebay right now.

ADCOMRED.jpg

Anybody???
Post edited by Toolfan66 on
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  • comfortablycurt
    comfortablycurt Posts: 6,745
    edited April 2010
    Blue board 750's were made in America, and the other 750's were made overseas(not sure where exactly).

    I've looked into this myself, and that's the only difference that I'm aware of.


    From what I understand, there isn't any real sonic difference between the two. Some people have claimed that the build quality of the blue board units is slightly better.
    The nirvana inducer-
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  • steveinaz
    steveinaz Posts: 19,538
    edited April 2010
    Maybe the blue boards are mil-spec, lacquer coated??
    Source: Bluesound Node 2i - Preamp/DAC: Benchmark DAC2 DX - Amp: Parasound Halo A21 - Speakers: MartinLogan Motion 60XTi - Shop Rig: Yamaha A-S501 Integrated - Shop Spkrs: Elac Debut 2.0 B5.2
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  • Ricardo
    Ricardo Posts: 10,636
    edited April 2010
    Blue ones have the same effect as Viagra.
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  • steveinaz
    steveinaz Posts: 19,538
    edited April 2010
    My CEC CDP has all blue boards.
    Source: Bluesound Node 2i - Preamp/DAC: Benchmark DAC2 DX - Amp: Parasound Halo A21 - Speakers: MartinLogan Motion 60XTi - Shop Rig: Yamaha A-S501 Integrated - Shop Spkrs: Elac Debut 2.0 B5.2
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  • Toolfan66
    Toolfan66 Posts: 17,244
    edited April 2010
    Well I got Blue Balls..
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  • steveinaz
    steveinaz Posts: 19,538
    edited April 2010
    ...those are definitely not mil-spec...LOL
    Source: Bluesound Node 2i - Preamp/DAC: Benchmark DAC2 DX - Amp: Parasound Halo A21 - Speakers: MartinLogan Motion 60XTi - Shop Rig: Yamaha A-S501 Integrated - Shop Spkrs: Elac Debut 2.0 B5.2
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  • sda2mike
    sda2mike Posts: 3,131
    edited April 2010
    those are strikingly handsome, in blue
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  • ALL212
    ALL212 Posts: 1,577
    edited April 2010
    The balls...or the boards?
    Aaron
    Enabler Extraordinaire
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  • sda2mike
    sda2mike Posts: 3,131
    edited April 2010
    the boards, man!
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  • cstmar01
    cstmar01 Posts: 4,424
    edited April 2010
    comfortablycurt wrote: »
    Blue board 750's were made in America, and the other 750's were made overseas(not sure where exactly).

    I've looked into this myself, and that's the only difference that I'm aware of.


    From what I understand, there isn't any real sonic difference between the two. Some people have claimed that the build quality of the blue board units is slightly better.

    from what I read and heard this was it. There was a guy selling one on audiogon and I inquired about it because he said the blue boards are worth more, but never really gave a reason why, just that it was made in the USA compared to china is the only reason why he said.
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  • jimangie1973
    jimangie1973 Posts: 1
    edited August 2010
    Raised from the dead....

    Both those pictures up top are of the blue board. They were American made with nice ALPS pots for the volume and balance controls. The red board models were just that, completely red and made overseas. The problem with the red board models is they use crappy pots with a large amount of 'play' or wiggle, definately not ALPS. I know this first hand because I ordered one of the red board units new and returned it soon after only to buy a blue board version on Audiogon.
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  • Toolfan66
    Toolfan66 Posts: 17,244
    edited August 2010
    Thanks!!! Now we are in the know..
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  • FTGV
    FTGV Posts: 3,649
    edited August 2010
    If I was the fortunate owner of one of these I would want to upgrade those cheap looking film caps they use for input and output coupling.
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  • heiney9
    heiney9 Posts: 25,165
    edited August 2010
    FTGV wrote: »
    If I was the fortunate owner of one of these I would want to upgrade those cheap looking film caps they use for input and output coupling.

    Tell me more? There is a thread on DIY Audio, but it's hard to follow. The guy replaced all the caps. I'm going to be ordering some coupling caps shortly for my Norh tube integrated. If you could point in the right direction on the Adcom with a few suggestions.

    H9
    "Appreciation of audio is a completely subjective human experience. Measurements can provide a measure of insight, but are no substitute for human judgment. Why are we looking to reduce a subjective experience to objective criteria anyway? The subtleties of music and audio reproduction are for those who appreciate it. Differentiation by numbers is for those who do not".--Nelson Pass Pass Labs XA25 | EE Avant Pre | EE Mini Max Supreme DAC | MIT Shotgun S1 | Pangea AC14SE MKII | Legend L600 | BlueSound Node 3 - Tubes add soul!
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  • FTGV
    FTGV Posts: 3,649
    edited August 2010
    The baby blue ones in the gain stages( center right in first pic)
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  • heiney9
    heiney9 Posts: 25,165
    edited August 2010
    FTGV wrote: »
    The baby blue ones in the gain stages( center right in first pic)

    You mean like this

    attachment.php?attachmentid=73154

    Seems some are missing?
    "Appreciation of audio is a completely subjective human experience. Measurements can provide a measure of insight, but are no substitute for human judgment. Why are we looking to reduce a subjective experience to objective criteria anyway? The subtleties of music and audio reproduction are for those who appreciate it. Differentiation by numbers is for those who do not".--Nelson Pass Pass Labs XA25 | EE Avant Pre | EE Mini Max Supreme DAC | MIT Shotgun S1 | Pangea AC14SE MKII | Legend L600 | BlueSound Node 3 - Tubes add soul!
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  • heiney9
    heiney9 Posts: 25,165
    edited August 2010
    Here's one thread.

    http://www.diyaudio.com/forums/pass-labs/37960-replacing-adcom-gfp750-caps.html

    Here's the other I was talking about

    http://www.head-fi.org/forum/thread/392211/adcom-gfp-750-diy-mod-finally-finished-warning-not-dial-up-friendly-loads-of-pics
    "Appreciation of audio is a completely subjective human experience. Measurements can provide a measure of insight, but are no substitute for human judgment. Why are we looking to reduce a subjective experience to objective criteria anyway? The subtleties of music and audio reproduction are for those who appreciate it. Differentiation by numbers is for those who do not".--Nelson Pass Pass Labs XA25 | EE Avant Pre | EE Mini Max Supreme DAC | MIT Shotgun S1 | Pangea AC14SE MKII | Legend L600 | BlueSound Node 3 - Tubes add soul!
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  • FTGV
    FTGV Posts: 3,649
    edited August 2010
    heiney9 wrote: »
    You mean like this

    attachment.php?attachmentid=73154

    Seems some are missing?
    Brock I only see an X.
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  • heiney9
    heiney9 Posts: 25,165
    edited August 2010
    FTGV wrote: »
    Brock I only see an X.

    I guess when you link a photo from a site one has to sign into, no one can see it unless they are signed in. Try this.
    "Appreciation of audio is a completely subjective human experience. Measurements can provide a measure of insight, but are no substitute for human judgment. Why are we looking to reduce a subjective experience to objective criteria anyway? The subtleties of music and audio reproduction are for those who appreciate it. Differentiation by numbers is for those who do not".--Nelson Pass Pass Labs XA25 | EE Avant Pre | EE Mini Max Supreme DAC | MIT Shotgun S1 | Pangea AC14SE MKII | Legend L600 | BlueSound Node 3 - Tubes add soul!
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  • FTGV
    FTGV Posts: 3,649
    edited August 2010
    Ok I see that.I found a schematic on your first link and it appears coupling is actually done with a cheap electrolytic bypassed with a cheap film.:eek:
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  • FTGV
    FTGV Posts: 3,649
    edited August 2010
    heiney9 wrote: »

    Seems some are missing?
    Yes he removed the stock film bypasses and replaced the 'lytics' with Black Gates which are now unobtainium.
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  • heiney9
    heiney9 Posts: 25,165
    edited August 2010
    FTGV wrote: »
    Yes he removed the stock film bypasses and replaced the 'lytics' with Black Gates which are now unobtainium.

    I think some ELNA Cerafine's might work nicely there. What do you think?
    "Appreciation of audio is a completely subjective human experience. Measurements can provide a measure of insight, but are no substitute for human judgment. Why are we looking to reduce a subjective experience to objective criteria anyway? The subtleties of music and audio reproduction are for those who appreciate it. Differentiation by numbers is for those who do not".--Nelson Pass Pass Labs XA25 | EE Avant Pre | EE Mini Max Supreme DAC | MIT Shotgun S1 | Pangea AC14SE MKII | Legend L600 | BlueSound Node 3 - Tubes add soul!
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  • heiney9
    heiney9 Posts: 25,165
    edited August 2010
    Or maybe some nice Obbligato's or Mundorf's.......I guess we don't want 'lytics in there.
    "Appreciation of audio is a completely subjective human experience. Measurements can provide a measure of insight, but are no substitute for human judgment. Why are we looking to reduce a subjective experience to objective criteria anyway? The subtleties of music and audio reproduction are for those who appreciate it. Differentiation by numbers is for those who do not".--Nelson Pass Pass Labs XA25 | EE Avant Pre | EE Mini Max Supreme DAC | MIT Shotgun S1 | Pangea AC14SE MKII | Legend L600 | BlueSound Node 3 - Tubes add soul!
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  • FTGV
    FTGV Posts: 3,649
    edited August 2010
    Well since the output caps (4 needed) are 100uf a film cap would be prohibitively large and expensive,so a premium lytic might be the realistic choice.The Cerafines would certainly be good but having recently tried a pair in a DAC project I would try to source some Sanyo OScons.As for the 10uf input caps I would look at maybe trying the Panny ECQ's film's if they will fit in the alotted board space .While inexpensive they are quite good for coupling purposes and I believe Pass used them in the Aleph P(atleast it appeared so in the pic I saw of the inards.)
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