Build amplifier
Design notes (specifications):
- valve preamp (such as Octave's Phono Modul) or passive preamp (such as Music First Audio's Classic Preamplifier)
- built-in preamplifier suitable for various analog and digital sources, w. auto-detection and auto-protection - minimum 2, upgradeable to many (turntable, tape, CD/DVD/SACD, video, tuner/AUX, MIC, USB, HDMI, Ipod, LAN/Wireless etc.), and auto-switch-able IN/OUT paths:
- D/A-converter:
- MOSFET in Zen amp by Nelson Pass, or similar:
- built-in 1-scale FM radio w. RDS, at least 50 preset stations
- built in internet radio
- built-in controls for volume, bass/treble, DSP, multiple EQ (5-10 bands)
- memory presets for controls, individually on radio station and/or record
- support for AudioTag and other online video, music and lyrics databases to get informations related to the record played (freeDB, CDDB, MusicBrainz, IMDB, MLDb, / other music databases etc.)
- remote control (IR + RF, programmable, universal)
- web server for setup (linux)
- multi-color display panel, more like a monitor
Nelson Pass (Pass Labs):
DIY Audio Projects - DIY Hi-Fi for Audiophiles:
- valve preamp (such as Octave's Phono Modul) or passive preamp (such as Music First Audio's Classic Preamplifier)
- built-in preamplifier suitable for various analog and digital sources, w. auto-detection and auto-protection - minimum 2, upgradeable to many (turntable, tape, CD/DVD/SACD, video, tuner/AUX, MIC, USB, HDMI, Ipod, LAN/Wireless etc.), and auto-switch-able IN/OUT paths:
- analog IN: balanced (XLR) +0 dB
- analog IN: unbalanced (RCA) +6 dB
- digital IN: 24bit / 96kHz
- digital IN: balanced 110 ohm (XLR) AES / SPDIF (??!?)
- digital IN: coaxial (RCA) 75 ohm
- analog OUT: balanced variable (XLR) +12dBU (??!?)
- analog OUT: unbalanced variable (RCA) +6dBU (??!?)
- analog OUT: unbalanced fixed (RCA) +6dBU (??!?)
- digital OUT: SPDIF (passive)
- digital OUT: HDMI (passive)
- digital OUT: optical (passive)
- D/A-converter:
- 24bit / 96 kHz (upgradeable to 96 bit / 192 KHz)
- sample rates: 44.1 / 48 / 96 KHz
- THD: less than 0.001 dB
- S/N ratio: over 110 dB
- MOSFET in Zen amp by Nelson Pass, or similar:
- impedance: 4-8 ohms
- power: 50-75 W / mono-block channel, in stereo (upgradeable to 5.1)
- frequency: 20 Hz - 50 kHz
- dynamics: 120 dB
- S/N ratio: over 110 dB
- THD: less than 0.001 dB
- analog OUT: speakers 4-8 ohms, 50-75 W / mono-block channel, 2/5.1 channel
- analog OUT: headphones (Class A MOSFET design), ± 3.5V / 400mW / 32 ohms
- built-in 1-scale FM radio w. RDS, at least 50 preset stations
- built in internet radio
- built-in controls for volume, bass/treble, DSP, multiple EQ (5-10 bands)
- memory presets for controls, individually on radio station and/or record
- support for AudioTag and other online video, music and lyrics databases to get informations related to the record played (freeDB, CDDB, MusicBrainz, IMDB, MLDb, / other music databases etc.)
- remote control (IR + RF, programmable, universal)
- web server for setup (linux)
- multi-color display panel, more like a monitor
Reference
Music First Classic preamp, with TX102mk2 transformers - review by Maarten van Casteren
Octave Phonomodul - analogue done right!
'Noisy' on Tubes vs. Solid State
Octave Phonomodul - analogue done right!
'Noisy' on Tubes vs. Solid State
- Articles and Projects - PDF files
- The Pass Zen Amplifier– 10 Watts of Single-Stage Single-Ended Class A
- Return of Zen – Upgrades to the Single-Stage, Single-Ended, Class A Mosfet Amplifier
DIY Audio Projects - DIY Hi-Fi for Audiophiles:
- DIY Class-A 2SK1058 MOSFET Amplifier, by Mark Houston - intended to be a Zero Component Amplifier (ZCA)
- DIY Solid State Hi-Fi Audio Projects
- DIY Vacuum Tube (Valve) Amplifier Projects
Ralph Stens - diy projects for audio devices (preamplifier, amplifier, turntable, loud speakers), as well as links to other sites
Elliott Sound Products - Professional results for the Do-It-Yourself enthusiast
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