If I had to guess how many hours they've been used, I would say 200 hours. They are in tremendous shape cosmetically and sonically. Oddly, I am putting the amps up for sale despite just finishing some spring upkeep/upgrades. I had just sent the amps in to Paul Fargo (Manley's tech) for a check up. Obviously he said everything was perfect, I'm a bit OCD and it wasn't called for. I also used Deoxit Cleaner and Gold Rejuvinator on all of the contacts. I sold the power cords and EL84s on Ebay.
So the amps do not have power cords or EL84 tubes! These monoblocks only come with the Ei 12AT7 and 6414 vacuum tubes included (which have 200 hours on them).
The boxes, instructions, and receipt are included. Manley built those boxes very well, so you don't have to worry about them being shipped. FedEx also is the best shipper by far, with very reasonable prices to boot.I will also include (

black Audio Selections support discs (adhesive backing still unused).
Hopefully I've explained all I have needed to. Feel free to ask information, request more photos, etc.. As for my personal accountability, I have been on Ebay for years. You can see my profile on Ebay: irishpatrick33. Go to Ebay, click on COMMUNITY tab on top right, then just enter my name and click FIND A MEMBER. Money order or paypal. Buyer pays paypal fee.
MANLEY INFO:
These cute little guys produce around 40 watts RMS in Ultra-Linear mode or around 20 watts in TRIODE from a quartet of EL84 / 6BQ5 tubes driven by a 6414 dual triode driver and a 12AT7EH input dual triode. The EL84 has been one of our very favorite tubes for many years, extremely long lasting and reliable, and can be considered the smaller brother of the much beloved EL34: really quick-sounding both in the bass and especially in the top end. And of course this has a lot to do with our Manley Output transformer, the same one we build for the Manley Stingray.
We have been building EL84 amplifiers for well over a decade. The Manley-branded Tiny Triodes were much acclaimed in the early 1990's. In 1993 after the Manley company split off from VTL, the Manley Tiny Triodes underwent a chassis rework to become the Manley 35 watt Monoblocks soon followed by the 50 Watt Monoblocks. The more powerful Ultra-Linear mode operation became the standard with hard-wired Triode operation or Triode/UL switching available upon special request.
After the introduction of the Stingray Integrated amplifier in 1998, we then went back and incorporated the Stingray's new circuitry design refinements into the 50 Watt Monoblocks. Finally, big bass out of a small amplifier! So, topology-wise, the post-1998 50 watters were the monoblock version of the stereo Stingray, with the additional variable feedback feature. After the introduction of the fabulous Manley Snappers in 2002, it was obvious that we had to update our classic EL84 50 watt monoblocks both cosmetically and feature-wise. Make-over time!
Everyone was always asking us for Triode/Ultra-Linear switching. We listened to ya and put on the Triode-UL switch as standard for the new MAHI's. As are the beautiful german WBT binding posts. Also we increased the B+ rail capacity in a major way. The 50 Watt monos only had around 45 Joules or energy storage in the B+ rail. Now the MAHI's have nearly 115 Joules of energy storage for the B+ rail. You can hear this improvement in the especially in the bass region: tighter, faster, deeper. More is more in this case.
The chassis design is like a mini-Snapper. They are so cute! And of course they come standard as a pair so you get.... "Mahi-Mahi."
We believe the MANLEY MAHI's give a lot of value for an affordable price and we think you will be surprised at just how big these little guys sound.
Features And Specifications
Manley MAHI®
Input Tube: 1 x 12AT7EH large plate Eletcro-Harmonix Russian
Driver Tube: 1 x 6414 JAN NOS GE or Raytheon branded
Output Tubes: 8 x EL84 Ships with Russian NOS EL84M (aka 6Pi14Pi-EB) We are out of Ei 6BQ5.
Output Tube Quiescent Standing Current: 20mA
Set Bias for 200mVDC measured across each 10 ohm cathode resistor
Gain: 29dB
Negative Feedback: MIN= 3dB; STD=6dB; MAX=10dB of global NFB
Input Impedance: 110 Kohm
Input Sensitivity for Maximum Output Power: defined as input voltage required in order to produce maximum power output reaching 1.5% THD @ 1KHz
TRIODE UL
FB MIN: 175mV 155mV
FB STD: 312mV 340mV
FB MAX: 480mV 566mV
Input Sensitivity for 1W into 8 ohms: 61mV 53mV
Maximum Output Power: defined as power output reaching 1.5% THD @ 1KHz
into 5 ohms:
TRIODE UL
FB MIN: 18W 20W
FB STD: 27W 42W
FB MAX: 28W 46W
into 8 ohms:
TRIODE UL
FB MIN: 14W 24W
FB STD: 24W 40W
FB MAX: 25W 41W
Signal to Noise Ratio Ref. 1W: Typically 82 dB A-WGT 20-20K
Noise Floor: Typically 150µV = -74dBu A-WGT
Noise Floor: Typically 650µV = -62dBu unweighted
Will Scratch Your Floor: Use pennies under pointed feet to avoid marring cabinetry. Try quarters if you are in upper tax brackets. The bargain performer would be nickels. Paper currency does not function as well. Euro coins work 1.54 times better. Concrete pavers or wooden chopping blocks serve fine for amplifier platforms.
Dynamic Range: 83dB
THD+Noise @ 5W: less than 0.15%
Frequency Response at full power UL mode w/MAX NFB: 20 Hz to 20 kHz FLAT
Frequency Response at 5W into 5 ohms: 10 Hz to 30 kHz FLAT, -3.75dB @ 100KHz
Recommended Speaker Load: Optimized for 5 ohms
Output Impedance:
TRIODE UL
FB MIN: 2.43 ohms 3.10 ohms
FB STD: 1.47 ohms 1.67 ohms
FB MAX: 0.90 ohms 0.95 ohms
TRIODE UL
FB MIN: 3.29 2.58
FB STD: 5.45 4.78
FB MAX: 8.90 8.43
Damping Factor:
TRIODE UL
FB MIN: 3.29 2.58
FB STD: 5.45 4.78
FB MAX: 8.90 8.43
Power Consumption (idle): 102 Watts (0.85A @ 120VAC)
Maximum Power Consumption (at Full Power): 168 Watts (1.4A @ 120VAC)
Operating Mains Voltage: Factory set for 100V, 120V or 220-240VAC operation for original destination country's mains voltage.
Operating Mains Voltage: changeable with power transformer re-wiring and fuse value change.
Mains Voltage Frequency: 50~ 60Hz
Mains Fuse 100-120VAC operation: MDA 3 Amp SLO-BLO Ceramic Time-Delay fuse
Mains Fuse 220-240VAC operation: MDA 2 Amp SLO-BLO Ceramic Time-Delay fuse
B+ Fuse: MDA 400 mA SLO-BLO Ceramic Time-Delay fuse
Badge Illumination: Units produced before 3/2003 use 8V, 0.3A "Fuse-Lamp" 1/4" X 1 1/4"
Serial numbers after MAHI036 use LED illumination which probably won't burn out
Dimensions: 11" deep x 10" wide x 5" tall
Shipping weight each: 18 pounds
http://www.manleylabs.com/containerpages/MAHI.html