This amplifier is part of the estate of our departed friend ClaytonSF.
Clayton's family has asked me to assist them sell some of his equipment.
100% of the proceeds from this sale will go directly to Clayton's family.

Rare Custom Woo Audio WA4 with original box.
This example was made by Jack Wu for Clayton to his specification which included some upgraded components and omitting the speaker taps.
Pictures show the amp is built on the same chassis as the standard amp, and that Jack capped the speaker output and speaker/headphone switch holes.

Like most of Clayton's equipment, this amp looks and sounds great.
This is also the densest amp I've ever seen, weighing a hefty 35 lbs in spite of the small footprint.
Asking $1050 plus actual shipping cost.
Please PM with any questions.

Following is a description of the amplifier from Jack Wu:

Here are some info about the WA4.

It was introduced in 2008, priced at $1399. It is a excellent sounding amp and people will find it very valuable at today's high end audio price. I would sell it at the 2nd hand market at $1500. The tubes are easy to find and all self-replaceable.


Technical Specifications :
Headphones impedance : 8-800 Ohms

Frequency response: 18 Hz - 40 KHz, -2dB

Power output = 1 watt

Signal/Noise: >= 95 dB

THD: <= 0.08%

Voltage: AC 110/220V, 50/60 Hz

External dimension: 5½"(H), 13"(W), 7½"(D)

Weight: 30 lbs

Standard Features:
Point-to-Point wiring

ECC82 / 12AU7 [PDF] - drive tube, dual triode in parallel, one per channel

6C19 [PDF] - power tube single triode, one per channel

Two EZ80 [PDF] rectifier tubes

Four pairs of gold-plate RCA inputs

High or low headphone impedance switch

One ¼" headphone jack

Individual power supply transformer per channel

Individual choke per channel

high-end output transformer design

Brief Introduction to 6C19:
6C19 is a single power triode tube. It is excellent for headphone amplifiers: low plate resistance (300 ohms) and large plate current(105mA).

Sale Conditions:

• Buyers to pay actual shipping costs or provide shipping labels.
• First priority will be to buyers who can pick up in San Francisco Russian Hill.
• Descriptions are as accurate as possible given the circumstances.
• Offers will be considered for purchase of multiple items.
• Please communicate by PM if you are interested in any item.
• Please send offers and any questions by PM.

Please see my other ads for more fine equipment from Clayton's collection.