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Headphone Inventory:

I used to have this in chronological order but can't remember the order anymore.

I have probably forgotten some cans completely. I have too many of them.

AKG:
K130
K141-M (new and old, newer sold)
K145
K240-DF
K240 Sextett MP
K240 Sextett LP (Sold!)
K240-M
K260 Pro
K270 Playback
K300-M (gone)
K301 (gone)
K340 (bass-lite)
K401
K500 (together at last!)

Audio-Technica:
ATH-1
ATH-2 (x2)
ATH-A900 (Sold!)

BeyerDynamic:
DT250-80
DT302
DT770 Pro/80
DT801 (gifted out)
DT880-S (Edition 1980)
DT990 (Edition 1990)

Etymotic:
ER-6i (with iCable!)
IM-716

Fostex:
T10
T20 v1
T20 v2
T30 (x2)
T40
T50 v2 (aka Maior RPT-50)

Koss:
ESP6
ESP9
KSC75
UR40
Pro4AA
Pro4AAT
HV/1-LC (demolished)
A/250
ESP/950

MB Quart / Peerless-MB
QP55x
QP85
PMB-100

Realistic:
Pro 10 (ortho retrofit, needs tuning)
Pro 30 (x2)
Pro 60 (aka Koss HV/X) (with ortho retrofit)
LV-10 (aka Koss HV/10)

Sennheiser:
PX100 (black, old version i think)
CX300 (gone)
HD25sp

Stax:
SR-001 Mk2
SR-30 Pro
SR-80 Pro
SR-X III
SR-5
SR-Lambda

Sony:
ECR-500
MDR-V600 (Given away)

Yamaha:
HP-50A
YH-1
YH-2
YH-3
YH-100

Misc:
Accura SR-660
RFT HOK80-2 (the pinnacle of east german orthodynamic headphone technology)
Marantz SE-1 (doesn't work)
Magnavox 1A9217
Superex PEP-71
Akai ASE-50

Headphone Amp Inventory:

I build DIY amps for fun. To date i have built:

A cmoy, with onboard regulator and 18v wallwart. opa2134. Gifted to my father, then brought back for repairs and upgrades. still on the workbench. really oughta fix it.

A47 (2x opa2107), wall-powered 18-0-18 dual regulated power supply, modified linkwitz crossfeed, and all in a mint tin.

AMB Labs M3, with opa627/637 combo.

Sijosae iHybrid Nano 6111WA + jrc4556 (I think) - teeny tiny mint tin tube/chip hybrid. Gifted to my father.

Sijosae's "Simple Class A-B" v.1 headphone amp, 12v wall powered, opa2111 + bc550/560, gifted out to my brother Andrew. He drives eensy 'puter speakers with it, and it sounds great. Go figure.

Millet Hybrid RevMH + diamond buffer, with toshiba power transistors and Silmic II output caps. Mounted in a cigar box.

SOHA v.1, hand-made on perfboard. GE 5963 + lm4562. In dire need of a beefier output stage, but it drives 600-ohm AKGs beautifully.

Millet Hybrid Maxed, mosfet output, Muse KZ output caps. Still need to do the case work.

Mini3 v.2, high performance variation. Highly recommended if you can do SMT work.

CK2III - Sanyo output transistors. Highly recommended for DIYers who want to move up from the CMOY and do something worthwhile. Very musical amp that doesn't cost much to build.

Bijou all-tube streamlined futterman OTL. 6n1p-ev + 6n6p. An excellent tube amp, but expect to spend at least $200 building it. $50 of that just on the power transformer - a harrowing experience for a cheap bastard!

I also own a GoVibe v.5 basic, which I'll probably sell after i drill the end panels for the mini3. It's good, but not as good as the mini3.

If stax stuff counts here, i have an SRD-4, two SRD-7's, and an SRD-X.