For sale is my beloved WA4 headphone amp. This is an amp that has gotten very little attention on the forums here, but is one of the best I've ever heard. This is the amp previously owned by LeChuck. This amp has had over $500 of upgrades from the original design, done by Jack Wu. Per LeChuck this includes:
"a ton of Blackgates, V-Caps, and a total reworking of the circuit topology to make it a headphone-only design (and thus, fully optimized for that purpose)"
I've read that Jack Wu has said that this amp (the unmodified version) falls somewhere between the WA6SE and WA5. I've heard both the WA6SE and WA5 on seperate occasions and I can attest to the fact that it is definitely better than the WA6SE.
This is a very fast and dynamic amp. Jack Wu said of it:
"In brief, the newer version offer the fastest speed among all other models we build. This version has better dynamic, separation, and bigger soundstage than the previous builds." -Jack Wu
The amp is in fully working condition. This version of the amp has ECC88x2, ECC82x2, and 6C19x2 tubes. I recently upgraded the ECC88s to Mullards; they have less than 20-30hrs on them. The ECC82 tubes are RFTs. The 6C19s are Sovteks. I also have an assortment of other tubes I can throw in but I can't attest to their quality (some of them seem to have crackles).
Here's some photos of the amp. They're from the previous seller but the amp is in exactly the same condition except for different tubes. This is a serious beast of an amp. It weighs around $35 lbs or so. The amp has both a high and low impedance switch and works great with all headphones. I've personally used it with both 300ohm Sennheisers and 45ohm Audio Technicas and it drove each of them extremely well. Also of note is that it has 4 RCA inputs.
All told with the upgrades and tubes this amp has over $2000 of value. I've heard amps costing much more than this that are trounced by this amp. I've never heard an amp for less that beats it. At the price I'm looking for it's a steal value-wise.
Stock WA4 internal
Upgraded WA4 internal
Price is PM for price.
I have an entire thread of good feedback in the feedback forum.
Edited by strangelove - 4/9/11 at 10:51am