Adcom Gfp 750 // Solid-State Preamp / Orig. Box & Remote

SOLD , now part of a Private Collection

On any list of "sleeper preamps," this one would have to land near the top. Adcom name, designed by Nelson Pass.

Production
1999
Condition
9/10
Serial No.
P751DB03075
Restoration
  • Full 30-point service check
  • Cleaned controls, switches, and chassis
Factory Specs

Type   Solid-state preamplifier

Frequency response   20Hz to 20kHz

Total harmonic distortion   0.017%

Input sensitivity   365mV (line)

Signal to noise ratio   102dB (line)

Output   1V (Pre out)

Dimensions   17"W x 4.25"H x 12"D

Weight   15 lbs.

Documentation

Adcom GFP 750 Owner's Manual

Liner Notes

The GFP-750 is a Nelson Pass design—essentially a variation on the Pass Labs Aleph P and Pass's DIY project, The Son of the Bride of Zen. The circuit couldn't be simpler. Says Pass, "It's a differential pair—the end. A single gain stage, balanced input, balanced output, no feedback....We took a pair of MOSFETs, and the inputs go to the gates of the MOSFETs. The MOSFET sources are tied together and biased with a current source, with the signal taken off the drains. [The circuit] can run unbalanced on either side, although the performance is best when it's run balanced."

Stereophile, Mar '99

Stock No.
7601885642973

On any list of "sleeper preamps," this one would have to land near the top. Adcom name, designed by Nelson Pass.



Production

1999

Condition

9/10

Serial No.

P751DB03075

Restoration

  • Full 30-point service check
  • Cleaned controls, switches, and chassis

Factory Specs

Type   Solid-state preamplifier

Frequency response   20Hz to 20kHz

Total harmonic distortion   0.017%

Input sensitivity   365mV (line)

Signal to noise ratio   102dB (line)

Output   1V (Pre out)

Dimensions   17"W x 4.25"H x 12"D

Weight   15 lbs.

Documentation

Adcom GFP 750 Owner's Manual

Liner Notes

The GFP-750 is a Nelson Pass design—essentially a variation on the Pass Labs Aleph P and Pass's DIY project, The Son of the Bride of Zen. The circuit couldn't be simpler. Says Pass, "It's a differential pair—the end. A single gain stage, balanced input, balanced output, no feedback....We took a pair of MOSFETs, and the inputs go to the gates of the MOSFETs. The MOSFET sources are tied together and biased with a current source, with the signal taken off the drains. [The circuit] can run unbalanced on either side, although the performance is best when it's run balanced."

Stereophile, Mar '99

Stock No.

7601885642973

Adcom GFP 750 // Solid-State Preamp / Orig. Box & Remote
Adcom GFP 750 // Solid-State Preamp / Orig. Box & Remote
Adcom GFP 750 // Solid-State Preamp / Orig. Box & Remote
Adcom GFP 750 // Solid-State Preamp / Orig. Box & Remote
Adcom GFP 750 // Solid-State Preamp / Orig. Box & Remote
Adcom GFP 750 // Solid-State Preamp / Orig. Box & Remote
Adcom GFP 750 // Solid-State Preamp / Orig. Box & Remote
Adcom GFP 750 // Solid-State Preamp / Orig. Box & Remote
Adcom GFP 750 // Solid-State Preamp / Orig. Box & Remote
Adcom GFP 750 // Solid-State Preamp / Orig. Box & Remote
Adcom GFP 750 // Solid-State Preamp / Orig. Box & Remote

May We Suggest

Audio Research LS9 // Vintage / Solid State Line Stage Preamplifier

Audio Research Ls9 // Vintage / Solid State Line Stage Preamplifier

$1,399
Audio Research VM220 // Preowned / Tube Amplifier Monoblocks / Near Mint - 801/802

Audio Research Vm220 // Preowned / Tube Amplifier Monoblocks / Near Mint - 801/802

$4,899
Nakamichi BX-125 // Vintage // Solid-State Preamplifier

Nakamichi Bx-125 // Vintage // Solid-state Preamplifier

$499
Preowned / Woo Audio WA7 Fireflies // Tube Headphone Amplifier

Preowned / Woo Audio Wa7 Fireflies // Tube Headphone Amplifier

$699
Preowned / Audio Research VM220 // Tube Amplifier Monoblocks / Near Mint - 803/804

Preowned / Audio Research Vm220 // Tube Amplifier Monoblocks / Near Mint - 803/804

$4,899
Preowned / Schiit Bifrost // DAC

Preowned / Schiit Bifrost // Dac

$349
Preowned / Nagra VPS // MC Tube Phono Preamplifier

Preowned / Nagra Vps // Mc Tube Phono Preamplifier

$5,499
Vintage / Audio Research M-100 // Tube Amplifier Monoblocks / Beautiful

Vintage / Audio Research M-100 // Tube Amplifier Monoblocks / Beautiful

$3,999
Vintage / Audio Research LS2 // Tube Preamplifier

Vintage / Audio Research Ls2 // Tube Preamplifier

$1,199
Vintage / Cello RMC Phono // MC Phono Preamp

Vintage / Cello Rmc Phono // Mc Phono Preamp

$3,299
Preowned / AKG K1000 // Audiophile Ear Speakers / Original Box

Preowned / Akg K1000 // Audiophile Ear Speakers / Original Box

$1,499
Preowned / Acapella TW 1S // Ion Tweeter / Holy Grail

Preowned / Acapella Tw 1s // Ion Tweeter / Holy Grail

$6,999
Vintage / Marantz 7C // Legendary Tube Preamplifier / Original

Vintage / Marantz 7c // Legendary Tube Preamplifier / Original

ON HOLD
Preowned / Audio Research VM220 // Tube Amplifier Monoblocks / Near Mint

Preowned / Audio Research Vm220 // Tube Amplifier Monoblocks / Near Mint

$4,899
Preowned / Sonus Faber Cremona // Floorstanding Speakers / Maple

Preowned / Sonus Faber Cremona // Floorstanding Speakers / Maple

$3,999
Preowned / Wilson Watt/Puppy 6 // Reference Speakers / Piano Black

Preowned / Wilson Watt/puppy 6 // Reference Speakers / Piano Black

$5,499
Preowned / Avantgarde Trio G1 // 4 pcs 225 subs / Metallic Charcoal / Epic

Preowned / Avantgarde Trio G1 // 4 Pcs 225 Subs / Metallic Charcoal / Epic

ON HOLD
Vintage / Klipsch Heresy I // Speakers In Oiled Walnut / Original

Vintage / Klipsch Heresy I // Speakers In Oiled Walnut / Original

$1,599
Preowned / Quicksilver M-135 // 135wpc Tube Amplifier Monoblock / Pair

Preowned / Quicksilver M-135 // 135wpc Tube Amplifier Monoblock / Pair

$4,999
Vintage / Cello Etude // Passive Solid state Preamplifier

Vintage / Cello Etude // Passive Solid State Preamplifier

$2,299
Preowned / Nagra PL-P // Tube Preamplifier with Phono Stage / Pure Class A

Preowned / Nagra Pl-p // Tube Preamplifier With Phono Stage / Pure Class A

$6,499
Vintage / Audio Research SP-4 // Stereo Preamplifier

Vintage / Audio Research Sp-4 // Stereo Preamplifier

$1,399
Preowned / Benchmark DAC1 // Digital to Analog Converter (DAC)

Preowned / Benchmark Dac1 // Digital To Analog Converter (dac)

$399
Vintage / Avid Volvere // Reference Turntable / SME 309 / Denon DL103R

Vintage / Avid Volvere // Reference Turntable / Sme 309 / Denon Dl103r

$3,999
Vintage / Audio Research SP-3c // Tube Preamplifier / Minty Fresh

Vintage / Audio Research Sp-3c // Tube Preamplifier / Minty Fresh

$3,999
Vintage / Marantz Model 9 // Legendary Monoblock Tube Amplifiers / Original / Museum Quality

Vintage / Marantz Model 9 // Legendary Monoblock Tube Amplifiers / Original / Museum Quality

$19,999
Vintage / Audio Research SP-10 // Tube Preamplifier / Dual Chassis

Vintage / Audio Research Sp-10 // Tube Preamplifier / Dual Chassis

$3,999
Vintage / Audio Research SP-11 MKII // Hybrid Tube Preamplifier / Dual Chassis

Vintage / Audio Research Sp-11 Mkii // Hybrid Tube Preamplifier / Dual Chassis

$4,499
Preowned / Nagra PL-L // Tube Preamplifier / Pure Class A

Preowned / Nagra Pl-l // Tube Preamplifier / Pure Class A

$6,499
Vintage / Phase Linear 400 Series Two // Solid-State Amplifier

Vintage / Phase Linear 400 Series Two // Solid-state Amplifier

$799
Marantz 4270 // Quad Solid-State Receiver

Marantz 4270 // Quad Solid-state Receiver

$1,599
Vintage / Transcriptors Skeleton // Glass Cased Turntable / Hana SH Cart

Vintage / Transcriptors Skeleton // Glass Cased Turntable / Hana Sh Cart

$4,999
Vintage / McIntosh MC225 // Tube Amplifier / Professionally Restored

Vintage / Mcintosh Mc225 // Tube Amplifier / Professionally Restored

$6,599
Vintage / McIntosh MC2200 // Solid-State Amplifier / Professional Electronic Restoration

Vintage / Mcintosh Mc2200 // Solid-state Amplifier / Professional Electronic Restoration

$3,499
Vintage / McIntosh MR75 // Solid-State Tuner / Professionally Serviced / New Glass

Vintage / Mcintosh Mr75 // Solid-state Tuner / Professionally Serviced / New Glass

$1,299