Lil' Knight
Headphoneus Supremus
- Joined
- Sep 16, 2007
- Posts
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Quote:
Minor problem... Pete Millett's last name should be spelled with two 't's.
That'd cost quite a bit to fix the spelling
Minor problem... Pete Millett's last name should be spelled with two 't's.
Here's another unrefined build
Millet DCPP on a Zebrawood base.
Took me forever, but its finally done
Originally Posted by jlefley /img/forum/go_quote.gif
I finally got around to taking some pics of the β22/σ22 combo I finished up several months ago: (click for hi-res)
Some specs:
- β22 boards built with recommended parts, configured for gain of 5
- 4 channel, balanced configuration with selectable balanced/unbalanced input
- TPA Joshua Tree relay attenuator
- Dual XLR/TRS combo and 4-pin XLR output jacks
- Binding posts for speaker connections
- Dual σ22 boards built with recommended parts, configured for ±30V
- 80VA Avel-Lindberg main transformers
- 15VA Avel-Lindberg auxiliary transformer
- ε24 power switch driver circuit for power control
- σ25 power supply to provide DC to attenuation system
- DPDT relay switches power to both σ22 and σ25
- 16 contact umbilical cord provides power to β22 boards and attenuation system and also carries ground returns for unbalanced headphone connections, uses AMP CPC connectors
- Recessed LED on the power supply front panel provides power indication
- Par-Metal 20-12123B 12" x 12" x 3" enclosures ordered without panels and with 2 front frames per enclosure
- Custom 6mm panels machined from raw aluminum by Cam-Expert, black anodizing and white text fill completed after receiving panels
- Lian Li case feet
As for the performance, the amp sounds great. At this point I have been using it with a pair of Grado SR-60s and a Matrix Mini-i balanced DAC and the sound is phenomenal. Apart from this, I only have a Cmoy that I built ages ago so I don't have much to compare it to but the huge sound stage, clarity of individual instruments, and the speed this amp provides is nothing like I have heard before. The construction went fairly smoothly without any major problems. I was having some issues with noise and hum but ensuring that the case and panels were fully grounded eliminated nearly all the problems I was having. Even at full volume the amp is near silent with only a slight hiss which I assume is the noise floor of the DAC.
More pictures, including some taken during construction, can be found here: http://tech.gotdns.org/gallery2/main.php?g2_itemId=161
Top rig Beefy! Is your M3 still around?
Here’s a shot of my set-up, the speakers are not DIY, these are Ed Schillings (Hornshoppe) Horns which use the Fostex 126e driver.
I’ve changed the front and back panels of my DAC and PSU, all done by Cam-Expert.
and... the mancave with my next beta22 in the works.
Minor problem... Pete Millett's last name should be spelled with two 't's.
Lil' Knight said: