John Kenny Ciunas Dac

These diminutive Dacs pack quite a punch for their price and size. One of their claims to fame is a battery power supply, which is slowly charged by a trickle charger. This Dac came in for a battery replacement.


Another DDDac Completed

This DDDac uses the latest boards with built in Tent shunt regs along with my usual custom built power supplies and other upgraded components.

The received wisdom is that you need more than one Dac board to drive output transformers but in back to back comparisons I have proved this not to be the case. Whilst the buffer output stage added some ‘thickness’ to the sound it loses out on naturalness and air and ‘Joie de vivre’. As usual I’ve used my favourite Italian case with thick alloy front plate. 

Feedback and Recommendations

There’s been a lot of highly positive feedback of my work publicly posted on the Web. Here’s a selection of recommendations and feedback:

‘The upgrade work carried out to the WD Power, Pre and Phono has lifted the system beyond what I had wished for. David gives a reliable, knowledgable cost effective service with good communication and is very accommodating…. What more can you ask for?
The Custom built DACs, hand built and professionally finished in high spec casings are also of a very high standard and sounded utterly wonderful. A great alternative to inferior price point products available in the commercial HIFi world. No Middleman, no BS, No advertising and marketing…It just makes sense!
Highly recommended.’

General Recommendations

General Recommendations 2

General Recommendations 3

Ear Headphone Amp Upgrade

Goodmans Magister Restoration

DDDac see post 8 of thread


Recent Projects

IMG_20151221_200113818Some Recent or Completed Projects
1. Valve Amplifiers /Preamps 

Built KT88 and EL34 stereo valve amps

Built 300b Monoblocs
Built 300b stereo valve amp with interstage transformer
Built Cathode follower, Aikido and other valve pre amps

Upgrade of top of range Ming Da pre including shunt pot and key signal path components
Upgrade of 300b stereo amp with battery bias, coupling capacitors, and key signal resistors
Upgrade of 300b monoblocs with battery bias and key signal components
Installation of own design psu upgrades to Cathode Follower pre + upgrade of key signal components
Upgrade of 300b amp with new choke psu, battery bias and signal resistors

Upgrading power supply of Amphion 6C33 Monoblocs, plus upgraded key signal components

Upgrade and servicing of Amplifon 6C33 push pull amplifier

Upgrade of Cathode follower Pre amp with split psu rail, shunt pot mod etc

Rebuild of 2E22 Chinese SE amp with upgraded power supplies, Western components, Hammond output transformers etc

Repair of Valve Amplification Company (VAC) Renaissance 30/30 amplifier

Upgrade of Yaqin 300b SE amp and removing all local and global feedback. This amp is now definitely a giantkiller!

Service /upgrade of Tube Technologies Unisys amp

Servicing /repair/upgrades to four Audio Innovations 500 amplifiers

Service /repair to Audio Innovations 300 amplifier

Upgrade to Ming Da 300b preamp

Repair /upgrade to Conrad Johnson CT 5 preamp

2. Valve /Solid State Hybrids
Upgrade of ARC SP9 pre including addition of choke regulated power supply

3. Digital /Dacs
Conversion of 5 CD players using TDA 1541 chips to NOS output, with different designs of output stage from capacitor direct, transformers and valve output stages

Conversion of I Pod to high quality digital source

Built custom Dac with valve output and masterclock synched to custom transport
Building of 5 DDDacs

Upgrading of power supplies on around 10 CD players

Repair /upgrade of  Helios CD player

Repair /upgrade of Theta Basic

4. General
Installation of remote control facility on 6 amplifiers and preamps.

Construction of 3 T amps