FS WAD PSU, Pre II and Phono II

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adrian
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Posts: 133
Joined: Fri Aug 03, 2007 10:28 pm
Location: London

FS WAD PSU, Pre II and Phono II

Post by adrian » Sat Sep 01, 2018 5:21 pm

P1040278.JPG
World Audio Designs PRE 2, PHONO 2 & Joint PSU - Heavily Modded

Built from a WAD kit but subsequently heavily modified - almost everything that could be upgraded has been, using high-end components: Kiwame resistors, a smattering of Shinkoh’s, Black Gates etc. The sound is authoritative and musical..
The cases are not perfect, but the face plates are fine

PSU

Converted to a pseudo mono set up (by David Coe).
Upgraded with Soniqs, Russian Teflon, Elna Cerafine Caps and Kiwame resistors.
Choke upgrade. The original choke can be put back if you do not like the mounting of the new (large) one on the top of the PSU.

Pre II

Converted to Cathode Follower (CF) configuration (this overcomes the hum issues that some experienced with the original design).

Obliggato gold premium film caps
Kiwame resistors
Elna rotary selector switch
Alps Blue volume potentiometer. Pseudo-shunt mod using 2 x Shinkoh Tantalum resistors
Short signal runs by shifting switch and volume pot to rear. I used plastic chop-sticks for this, which offer a night-and-day improvement over wooden ones ()
Mullard E88CC valve

Phono II

Lots of boutique caps (AmpOhm, Jupiter Beeswax, Black Gate, Sanyo Os-con, etc) and resistors. RIAA curve tweaked for closer matching
Cathode bypass caps to the first valve cathode resistors

2 x Cinemag transformers
2 x Sanyo OsCon caps
2 x Jupiter Beeswax caps
2 x AmpOhm 10uF caps
3 x General Electric 5751 valves
Happy to demonstrate in North London, just north of Finsbury Park

£650
Attachments
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adrian
User
Posts: 133
Joined: Fri Aug 03, 2007 10:28 pm
Location: London

Re: FS WAD PSU, Pre II and Phono II

Post by adrian » Sat Oct 06, 2018 2:30 pm

Reduced to £550

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