Reviewer: Marja & Henk
Financial Interests: click here
Sources: PS Audio PWT; Dr. Feickert Blackbird MKII/DFA 1o5/Zu DL-103; Phasure XX-PC;
DAC: Phasure NOS1 DAC; PS Audio Direct Stream DAC [loaner]; Pink Faun DAC 2.32 [in for review]
Streaming sources: XXHighEnd; iTunes; Devialet AIR; La Rosita Beta; Qobuz Desktop,; Pink Faun AV Streamer [in for review]
Preamp/integrated/power: Audio Note Meishu with WE 300B (or AVVT, JJ, KR Audio 300B output tubes); dual Devialet D-Premier; Hypex Ncore 1200 based monoblocks; Trafomatic Kaivalya; Trafomatic Reference One; Trafomatic Reference Phono One; Music First Passive Magnetic;
Speakers: Avantgarde Acoustic Duo Omega; Arcadian Audio Pnoe; Podium Sound One; WLM Sub 12; Sounddeco Alpha F3; dual Zu Submission MKI; Soltanus Virtuoso ESL
Cables: complete loom of ASI LiveLine cables; full loom of Crystal Cable cables; full loom of Nanotec Golden Strada; Audiomica Pearl Consequence interconnect; Audiomica Pebble Consequence; PTP Audio Blok20 [in for review];
Power line conditioning: PS Audio Powerplant Premier; PS Audio Humbuster III; IsoTek Evo 3 Syncro; AudioMica Allbit Consequence
Equipment racks: Solid Tech and ASI amplifier and TT shelf
Indispensable accessories: Furutech DeMag; ClearAudio Double Matrix; Franc Audio Ceramic Disc Classic; Shakti Stones; Akiko Audio sticks; Kemp polarity checker
Online Music purveyors:,, 
Room treatment: Acoustic System International resonators, sugar cubes, diffusers
Room size: ca. 14.50 x 7.50m with a ceiling height of 3.50m, brick walls, wooden flooring upstairs, ca 7 x 5m with a ceiling height of 3.50m, brick walls and concrete floor downstairs.
Price of review item: €2’250

A few months ago PTP Audio’s Peter Reinders had delivered his new bearing for a review and brought with him not only the PTP Solid12 turntable but also an amplifier prototype in the trunk of his car. After setting up the turntable and documenting the installation of the new bearing—see our review of it here—we had a sneak preview of the amplifier. Peter at the time was not quite sure yet whether the amplifier project would mature into a viable product or not.

The project started when Peter got his hands on some Texas Instrument LM1875 chips. Such chips are highly popular in the DIY audio community and amplifiers built around these chips are commonly referred to as Gainclones. That credits the original 47Labs Model 4706 Gaincard, an amplifier with a revolutionary low parts count and corresponding ultra-short signal path but a price tag that shook up many – mostly for the wrong reason by the way. It was said tag however which became incentive for many a DIYer to copy Junji Kimura’s idea, the man behind 47Labs. Where the original Gaincard used the LM3875 op amp as amplifier output stages good for maximally 56 watts per chip, the smaller LM1875 with its 20-watt rating features a slightly lower distortion number. It’s that chip which came into Peter’s possession.