YBM Audio currently concentrates on amplifiers and related gear. The product line consists of almost everything that AMB has to offer, plus one of the favorite hybrid tube-solid state designs - Millett Hybrid Maxed.

These amplifiers can be implemented in a wide variety of ways: pure headphone amp only, headphone amp/preamp, or even integrated amplifiers.

The prices below reflect the most popular configurations and options/upgrades on our completely finished products. However, in keeping with the DIY spirit, most of them can be altered to accommodate your needs -- just inquire.

Options and Upgrades: Options include parts and labor. No labor charge for Upgrades if specified before initial build; add labor otherwise. It is always helpful to specify Options before initial build since some Options are no longer possible without drastic and/or costly changes after the unit is built.

All prices are in US Dollars (USD). Shipping and handling not included unless otherwise noted. Paypal fee/custom duty/VAT, if applicable, not included.

Mini³

• Description:
  • A high-performance pocket-sized headphone amplifier with active ground channel. A perfect companion for your portable media player.
• Prices:
  • US and Canada: $175 + shipping. Battery charger is included.
  • Elsewhere: $170 + shipping. Battery charger is not included, it can be sourced locally. Shipping is via USPS First Class International unless requested otherwise.
    
• Standard features:
• High-quality Nichicon/Panasonic electrolytic capacitors.
• Precision 1% metal film resistors.
• Precision CNC-machined 2mm thick aluminum front-panel with overlapping and engraved lettering (black only).
• Choice of 2x / 3x / 5x / 8x gain. 5x gain unless requested otherwise.
• Ultra high capacity 325mAh 9V NiMH rechargeable battery.
• Extended runtime edition (optional High Performance edition available. See Options below).
• Green LED power indicator, red LED charge indicator.
• Aluminum knob with two "soft-touch" rings enable the user to "feel" the sensitive movement.
• Hammond aluminum enclosure (2.126 x 0.905 x 3.150"/54 x 23 x 80mm, W x H x D). Clear finish (Black finish available as an option -- see Options below).
• Stainless steel machine screws.
• Options:
• Black enclosure -- $8
• High Performance edition -- $6.50
• Precision CNC-machined 2mm thick aluminum back-panel with engraved lettering (black only) -- $16.50
• Spare battery -- $13.50
• Two quick-release aluminum thumb-screws for rear panel -- $6

Millett Hybrid Maxed

• Description:
  • A hybrid tube-MOSFET headphone amplifier biased heavily into class-A. The best marriage of tube and solid state. Craving for tubes?
• Price:
  • Configuration varies widely. Please inquire.

M³

• Description:
  • A very high-performance opamp-MOSFET based class-A headphone amplifier with active ground channel. Wide selection of opamps available. It shares the similar topology as the mighty three-channel β22 and powered by the equally impressive, optional σ11 power supply!
• Price:
  • Two versions available. Please inquire
• Version 1: With external σ11 power supply
  • Oversized toroidal power transformer.
• Nichicon/Panasonic electrolytic capacitors (low ESR, low impedance, low noise, high ripple current, high temperature, and long life).
• Wima/ERD/AVX metal film caps.
• Military-spec metal film precision 1% resistors.
• Alps Blue Velvet potentiometer.
• Neutrik 1/4" headphone jack.
• Gold plated chassis-mount RCA jacks.
• Separate aluminum enclosures for amp and PSU (6.15 x 3.10 x 8.5"/154 x 78 x 213mm, W x H x D).
• IEC AC inlet fuse chamber and switch.
• Machined gold plated DIP sockets.
• 3mm blue LEDs.
• Aluminum knob.
• Stainless steel machine screws used thru-out.
• Silver plated, Teflon® insulated copper hookup wire used thru-out.
• Default opamps are TI Burr-Brown OPA134. Others are available.
• Version 2: With external wall-wart power supply (for US and Canada only)
  • Nichicon/Panasonic electrolytic capacitors (low ESR, low impedance, low noise, high ripple current, high temperature, and long life).
• Wima/ERD/AVX metal film caps.
• Military-spec metal film precision 1% resistors.
• Alps Blue Velvet potentiometer.
• Neutrik 1/4" headphone jack.
• Gold plated chassis-mount RCA jacks.
• Aluminum enclosure for amp (6.15 x 3.10 x 8.5"/154 x 78 x 213mm, W x H x D).
• Machined gold plated DIP sockets.
• 3mm blue LED.
• Aluminum knob.
• Stainless steel machine screws used thru-out.
• Silver plated, Teflon® insulated copper hookup wire used thru-out.
• Default opamps are TI Burr-Brown OPA134. Others are available.
• Options:
  • Input pass-thru/loop-out -- $35
  • Additional input -- $40/set, switchable via rear-mount toggle switch.
  • Continuously variable gain -- $60
  • Variable bass boost -- $50 to $65
  • Op-amp options:
    • TI Burr-Brown OPA627
    • Analog Devices AD8610AR

CK²III

• Description:
  • A cost-effective, fully discrete, high-performance desktop headphone amplifier.
• Price:
  • Order suspended until further notice
• Standard features:
  • Toroidal power transformer.
  • Nichicon/Panasonic/Marcon electrolytic capacitors (low ESR, low impedance, low noise, high ripple current, high temperature, and long life).
  • Metal film capacitors.
  • Military-spec metal film precision 1% resistors.
  • Alps Blue Velvet potentiometer.
  • Neutrik 1/4" headphone jack.
  • Gold plated chassis-mount RCA jacks.
  • Aluminum chassis (8.66 x 6.3 x 2.03", D x W x H).
  • Aluminum knob.
  • 3mm green LED.
  • Stainless steel machine screws used thru-out.
  • Silver plated, Teflon® insulated copper hookup wire used thru-out.
  • IEC AC inlet.
• Options:
  • Ground loop breaker -- $15. It's necessary if you experience ground loop issue in your particular system. Click here for an very easy to understand article regarding ground loops.
  • Input pass-thru -- $20.

β22 with the companion σ22 power supply

• Description:
  • This represents the ultimate in headphone amplifier design. It can be implemented as a high-performance preamplifier, as well as integrated amplifier that powers efficient speakers in smaller space. If you must have the best and willing to put the money where your mouth is/ears are, this is it!
  • Please inquire.

σ22("sigma 22") power supply

• Description:
  • A high performance, high bandwidth, discrete, dual-rail, linear regulated, auto-tracking power supply with extremely low noise and ripple. An ideal companion for the β22.
  • Please inquire.

σ11("sigma 11") power supply

• Description:
  • A high performance, high bandwidth, discrete, single-rail, linear regulated power supply with extremely low noise and ripple. A power supply is the foundation of any electronic equipment, but often t ime, manufacturers choose to cheap out on it. Is your gear still powered by the DC wall-wart?!
• Price:
  • $275 to ~$320. The σ11 can be configured in many different ways to suit different applications (i.e. SqueezeBox, Apogee Mini DAC, and almost anything that uses a DC wall-wart.)
• Standard features:
  • Nichicon/Panasonic electrolytic capacitors (low ESR, low impedance, low noise, high ripple current, high temperature, and long life).
  • Vishay-Dale military-specification 1% metal film resistors.
  • Toroidal power transformer.
  • Ultrafast recovery diodes.
  • Shielded Delta IEC AC inlet with EMI filter, fuse chamber, and switch.
  • 3 mm blue LED.
  • Hammond aluminum enclosure (8.66" x 4.92 " x 2.03", D x W x H). Please specify clear (default) or black finish.
  • Shielded, detachable DC power cord terminated with Conxall twist-lock plug and barrel-type DC plug (Please inquire for other termination options).
  • On-board screw-mount 1.5" heatsinks.
  • Stainless steel machine screws used thru-out.
• Options:
  • Front-panels:
    • Wet-sanded, mirror-shine 1/4" black acrylic front panel -- $40. This is the perfect match for SqueezeBox.
    • Precision CNC-machined, custom engraved 4mm" thick black anodized aluminum front panel -- $40. Lead-time up to two weeks.
• Upgrades:
  • DC power cord standard length is up to 3 feet. Please add $5.00 per additional foot