Products

MA32-SE

MA-32 Single Ended Class A Stereo Power Amplifier

 

 

Product ID# SE-32P

$2295.00

MA-32

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The SE-32P utilizes a pair of horizontal output tubes paralleled in triode mode to produce 15 watts per channel. The input stage for each channel utilizes my proprietary constant current/infinite plate load resistance design that combines both triode sections of a 6N1P as the voltage amplifier and a 6CL6 as the current source. This is a true constant current source that will properly respond to the signal / voltage changes without a resistor dropping large amounts of voltage, typically in standard Mu follower circuits. This circuit design operates the input tubes at optimum linearity and is not subject to high plate load resistance or internal tube resistance to set the gain & linearity characteristics. The driver stage for each channel uses a 6SN7 of which one triode provides drive regulation and the other triode directly drives the output tubes- no coupling capacitors are used! The only capacitors in the signal path are between the input and driver stage. The output stage for each channel consists of two 12DQ6 horizontal sweep tubes paralleled in triode mode operating in class A. Without coupling capacitors each output tube receives the identical signal and therefore both output tubes can be electrically considered as one tube. The output transformers are custom designed and hand wound by McAlister Audio with four primary and three secondary interleaved sections with each layer varnished prior to insulation. A separate well regulated bias supply with external top chassis mounted adjustments. The power supply has over 2,000uF of initial capacitance bypassed with film capacitors. Electrolytic capacitors are only used in the power supply and never in the signal path. Plate voltage is delayed 40 seconds automatically on turn on to prevent cathode stripping. This proprietary circuit uses a damper tube and relay circuit producing an automatic controlled delay. Wiring is point to point with no circuit traces. A Separate power supply chassis that contains only transformers and relays with all rectification and regulation in the amplifier chassis. Only AC travels through the umbilical isolating D.C. signal voltages ensuring no possibility of interference.

Build Features:

Only film capacitors in the signal path
Hardwired point to point
Proprietary input and driver stage design directly connected to the output tubes
Special output transformer design
Thermal delay to prevent cathode stripping
Dimensions: 19”W x 14”D
Power Supply Dimensions: 12”W x 8”D

Build Options:

240 volt configuration available on request
LED colour choices for power on and operation status
Maple, Cherry, Oak or Paduke ( similar to mahogany) wood choices

Pricing: SE-32P $2295.00
All prices are in USD and do not include shipping or customs duty and brokerage fees if applicable.

Shipping Weight: 46lbs.

MA44-SE

MA44-SE Single Ended Class A Stereo Amplifier
Using Horizontal Output Tubes Paralleled in Triode Mode with 22 Watts per Channel.

 

 

Product ID# MA44-SE

$2695.00

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The MA-44 stereo single ended power amplifier utilizes four horizontal output tubes paralleled in triode mode to produce 22watts per channel in class A. The input stage for each channel utilizes my proprietary constant current/infinite plate load resistance design that combines both triode sections of a 6N1P as the voltage amplifier and a 6CL6 as the current source . This is a true constant current source with more than enough gain to properly respond to the small signal / voltage changes without a plate load resistor dropping large amounts of voltage typically in cascade designs. The driver stage uses a 6SN7of which one triode provides regulation with the other triode directly driving the output tubes in a cathode follower configuration without the need for capacitors. The only capacitors in the signal path are between the input and driver stage. The output stage for each channel consists of four 12DQ6 horizontal sweep tubes paralleled in triode mode with class A operation. No coupling capacitors are used to drive the output tube grids so in effect all tubes are connected together as one. This output configuration can pass a large amount of current with harmonic distortion in dB relative fundamental of 2nd -26, 3rd -44, and 4th - 60. A separate and well regulated bias supply with external top mounted chassis adjustment. The negative voltage is adjustable and fed to the control grid of the drive tube which determines the current flow in the output tubes. All of my power amplifier designs use a fixed bias voltage that eliminates the cathode resistor and electrolytic by-pass cap producing an amplifier with fast rise time, superior dynamics and transparency. The output transformers are custom designed and hand wound with four primary and three secondary interleaved sections with each layer varnished prior to insulation. The power supply has over 2,000uf of capacitance by-passed with film capacitors- electrolytic capacitors are only used in the power supply and never in the signal path. Plate voltage is delayed 30 seconds to prevent cathode stripping. This automatic system uses a damper diode providing D.C. relay voltage through a controlled warm up. Wiring is point to point with no circuit traces. A Separate power supply chassis that contains only transformers and relays with all rectification and regulation in the amplifier chassis. Only AC travels through the umbilical isolating D.C. signal voltages ensuring no possibility of interference .

Build Features:

Only film capacitors in the signal path
Hardwired point to point
Proprietary input and driver stage design directly connected to the output tubes
Special output transformer design
Thermal delay to prevent cathode stripping
Dimensions: 19”W x 14”D
Power Supply Dimensions: 12”W x 8”D

Build Options:
240 volt configuration available on request
LED colour choices for power on and operation status
Maple, Cherry, Oak or Paduke ( similar to mahogany) wood choices

Pricing: MA-44SE $2695.00
All prices are in USD and do not include shipping or customs duty and brokerage fees if applicable.

MA150-8

MA150-8 Stereo Tube Amplifier 75Watts per Channel

 

 

Product ID# MA150-8

$2695.00

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The MA150-8 stereo power amplifier utilizes 8 horizontal sweep tubes in the output stage producing 75 watts per channel. Four output tubes per channel lower the AC plate resistance allowing a smaller transformer turns ratio. 12EM7/12EA7 dual triodes are used for the input, phase splitter and driver stages with 12DQ6/6GW6 horizontal tubes in the output stage. Bias voltage is derived from a separate source and is well regulated with external top mounted adjustments. Fixed bias voltage eliminates the cathode resistor and electrolytic by-pass cap producing an amplifier with fast rise times, superior dynamics and transparency. The output transformers are custom wound M6 core that have 4 primary and 3 secondary sections with each layer dipped in varnish prior to insulation. Plate voltage is delayed 30 seconds to prevent cathode stripping. This high voltage delay is accomplished with a damper diode rectifying the relay coil voltage through a controlled warm up. A Separate power supply chassis that contains only transformers and relays with all rectification and regulation in the amplifier chassis. Only AC travels through the umbilical isolating D.C. signal voltages ensuring no possibility of interference . The power supply has over 2,000uf of capacitance by-passed with film capacitors. Electrolytic capacitors are only used in the power supply and power distribution networks. Distortion and speed are greatly improved with the addition of a drive stage between the front end 1st gain / phase splitter and output stage. The end result is an extremely stable high wattage power amplifier that has a flat frequency response; low distortion and output stage/transformer overshoot of less than 1%.

Build Features:

Only film capacitors in the signal path
Hardwired point to point
Special output transformer design
Thermal delay to prevent cathode stripping
Dimensions: 19”W x 14”D
Power Supply Dimensions: 12”W x 8”D

Build Options:

240 volt configuration available on request
LED colour choices for power on and operation status
Maple, Cherry, Oak or Paduke ( similar to mahogany) wood choices

Pricing: MA150-8 $2695.00
All prices are in USD and do not include shipping or customs duty and brokerage fees if applicable.

M170B

McAlister Audio M-170B Power Amplifier

 

 

Product ID# M170-B

$2995.00

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This amplifier has a completely novel circuit design producing 85 watts per channel accomplished with only two horizontal sweep tubes per channel. Hand wound output transformers with proprietary winding configuration along with 6 interleaved primary and secondary sections ensures superb performance with no overshoot, flat frequency response and low D.C. resistance on the secondary due to the low turns ratio. This provides excellent transfer and control to the speaker load and dynamically breaks back E.M.F.

Build Features:

Only film capacitors in the signal path
Hardwired point to point
Balanced and unbalanced inputs
Special output transformer design
Thermal delay to prevent cathode stripping
Dimensions: 19”W x 14”D
Power Supply Dimensions: 12”W x 8”D

Build Options:

240 volt configuration available on request
LED colour choices for power on and operation status
Maple, Cherry, Oak or Paduke ( similar to mahogany) wood choices

Pricing: M170-B $2995.00
All prices are in USD and do not include shipping or customs duty and brokerage fees if applicable.

MB-130

MB-130 mono block amplifier

 

 

Product ID# MB-130

$4495.00

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The MB-130 mono block amplifiers share the same circuitry as my MA150-8 amplifier but are dual mono with 6 output tubes per channel. 12EM7 dual triodes are used for the input, phase slitter and driver stages and EL504/PL504 horizontal tubes for the output stage. Bias voltage is derived from a separate source and is well regulated with external top mounted adjustments. Fixed bias voltage eliminates the cathode resistor and electrolytic by-pass cap producing an amplifier with fast rise times, superior dynamics and transparency. The output transformers are custom wound M6 core that have 4 primary and 3 secondary sections with each layer dipped in varnish prior to insulation. Plate voltage is delayed 30 seconds to prevent cathode stripping. This high voltage delay is accomplished with a damper diode rectifying the relay coil voltage through a controlled warm up. A Separate power supply chassis that contains only transformers and relays with all rectification and regulation in the amplifier chassis. Only AC travels through the umbilical isolating D.C. signal voltages ensuring no possibility of interference. The power supply has over 2,000uf of capacitance by-passed with film capacitors. Electrolytic capacitors are only used in the power supply and power distribution networks. Distortion and speed are greatly improved with the addition of a drive stage between the front end 1st gain / phase splitter and output stage. The end result is an extremely stable high wattage power amplifier that has a flat frequency response; low distortion and output stage/transformer overshoot of less than 1%.

Build Features:

Only film capacitors in the signal path
Hardwired point to point
Special output transformer design
Thermal delay to prevent cathode stripping
Dimensions: Each mono block; 12”W x 19”D
Power Supply Dimensions: two power supplies; 12”W x 8”D

Build Options:

240 volt configuration available on request
LED colour choices for power on and operation status
Maple, Cherry, Oak or Paduke ( similar to mahogany) wood choices

Pricing: MB-130 $4495.00
All prices are in USD and do not include shipping or customs duty and brokerage fees if applicable.

MA-150 SPECIAL

MA-150 Special with polished aluminium and copper sub chassis with Separate Power Supply Chassis

 

 

Product ID# PP150-8

$2995.00

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Here is a very unique MA-150 available as a special order. Polished top and bottom plates with a copper sub chassis. 12EM7/12EA7 dual triodes are used for the input, phase slitter and driver stages and PL-509 horizontal tubes for the output stage. Bias voltage is derived from a separate source and is well regulated with external top mounted adjustments. All of my power amplifier designs use a fixed bias voltage that eliminates the cathode resistor and electrolytic by-pass cap producing an amplifier with fast rise times, superior dynamics and transparency. The 12EA7/12EM7 dual triode has one section similar to the 6SN7 but with a 10 watt plate dissipation and the other similar to the ECC83. In each channel the two 12EA7/12EM7 sections do the first stage gain and phase splitting while the second 10 watt sections accomplish the drive for each output tube. This unit comes with a front mounted volume control and rear mounted on/off switch.
The output transformers are custom wound M6 core that have 4 primary and 3 secondary sections with each layer dipped in varnish prior to insulation. Plate voltage is delayed 30 seconds to prevent cathode stripping. This high voltage delay is accomplished with a damper diode rectifying the relay coil voltage through a controlled warm up. The separate power supply uses a massive power transformer system. High speed diodes, regulation and 2x 15,000uf of capacitance paralleled with film capacitors are used in the power supply. Electrolytic capacitors are only used in the power supply and power distribution networks. Distortion and speed are greatly improved with the addition of a drive stage between the front end 1st gain / phase splitter and output stage. The end result is an extremely stable high wattage power amplifier that has a flat frequency response; low distortion and output stage/transformer overshoot of less than 1%. This amplifier comes complete with a detachable power cord, IEC input, ceramic tube sockets, NOS tubes, and instruction manual with bias instructions. Tube compliment 4x 12EA7 / 12EM7, 4x Pl-509 and a 6AX4 used as the thermal delay. This unit comes with a one year warranty parts and labour except the tubes that are covered for 90 days.

Build Features:
Point to Point wiring
No electrolytic capacitors in the signal path
High quality film capacitors used in the signal path
Regulated fixed bias
Separate regulated screen supply
Amplifier dimensions:17”W x 14”D Power supply 8”H x 14”W X 8”D

Build Options:
Front panel lettering
LED color choice for power on and operation status
240 volt configuration available on request
Umbilical cord length between the power supply and amplifier to suit your needs.

Pricing: PP150-8 $2995.00
All prices are in USD and do not include shipping or customs duty and brokerage fees if applicable.

Shipping weight: a) amplifier 40lbs b) power supply 25lbs

OTL-195

OTL-195 Mono Block Amplifiers 195 watts per channel

 

 

Product ID# OTL 195

$8895.00

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An innovative new design offering superb efficiency and reliability with a continuous output of 195 watts per channel using 16 sweep tubes per mono block in the output stage.  

OTL’s ( no output transformer ) have the potential to produce lots of power with clean effortless sound and most important, very musical but also have a number of problems that have to be over come;

  • Inability to drive low impedance loads.
  • Numerous adjustments to keep internal signal balance.
  • Shortened output tube life
  • D.C. offset voltage; in fact some manufactures use large capacitance in series with the output tubes and speaker load to eliminate D.C. Any time large electrolytic capacitance is used in the signal path performance suffers.
  • Reliability

With this in mind I designed an OTL that overcomes all these issues- the original prototype designed 10 years ago is used in my personal home as the main amplification and still has the original output tubes.  

Completely balanced from input to output with only three user adjustments required and internal balance that is not dependent on tube emissions. The ability to properly drive 4 ohm load impedances. No electrolytics in the signal path and horizontal sweep tubes in the output stage that have lower second and 4 th harmonics, pass lots of current and are extremely reliable compared to the standard array of audio tubes. A very unique circuit that tracks the signal level in the driver stage and modulates the control grids of the output tubes. This gives superb efficiency as a super cathode follower and at low to moderate signal levels the output tubes are only operating at 1/3 of their plate dissipation. In addition the idle switch on the front panel reduces the operating current in the output stage to a fraction of the sum- a great standby feature. The OTL-195 using no output transformers with superb reliability, low output impedance, directly coupled is the best amplifier that I have designed and is distinguished from all other amplifier designs with a magical musical sound.  

Build Features:

  • Only film capacitors in the signal path
  • Hardwired point to point
  • Proprietary input and driver stage design directly connected to the output
  • 195 watts per channel
  • Balanced outputs
  • Balanced and unbalanced inputs
  • Simple bias check / adjustment
  • Frequency response 0.2dB 10Hz to 80kHz
  • THD 0.08% @ 5 Watt
    0.3%   @50 Watt
    0.31% @150 Watt
    0.36% @ 195 Watt
  • Output impedance 0.5 ohm
  • Unbalanced input   1.7 Vrms  for full output
  • Balanced  input       2x 0.85 Vrms for full output
  • Thermal delay to prevent cathode stripping
  • Simple bias check / adjustment
  • Separate Dual Mono power supply14”W x 12”D
  • Mono blocks finished in hand rubbed curly Maple
  • Dimensions:16”W x26”D  35LBS each

Build Options:

  • 240 volt configuration available on request
  • LED colour choices for power on and operation status
  • Maple, Cherry, Oak or Paduke ( similar to mahogany) wood choices

Pricing: OTL 195 $8895.00
All prices are in USD and do not include shipping or customs duty and brokerage fees if applicable.

MA-10B

MA-10B Custom Triode Line/Headphone Amp

 

 

Product ID# MA-10B

$1495.00

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Here is a custom built line level pre-amp & headphone amplifier. This amplifier is a special proprietary designed mu-follower with a 6B10 (both sides paralleled for the lowest noise and output impedance) as the gain tube and a 6SN7 as the current source for each channel. This is an extremely stable natural sounding pre-amp that uses no feedback and has no electrolytic capacitors in the signal path- only in the power supply.

The high voltage power supply regulator circuit uses a horizontal sweep tube followed with an oil filled capacitor. Secondary filtration with electrolytics by-passed with film caps. Regulated D.C. filament supplies are used for the6B10’s and 6SN7’s. The front panel has a four position selector switch, mute switch, volume, balance and headphone jack. The back panel has two sets of line out (RCA) four sets of RCA inputs, IEC connector and fuse holder. Using as a headphone amplifier there is plenty of headroom with 92 volts peak to peak that will sufficiently drive any headphone from 10 – 2,000 ohm impedance. As a line pre-amp you have 17dB of gain without feedback.

To sum up, this preamp uses no feedback, no transistors; no electrolytic capacitors in the signal path, horizontal sweep tube and choke loaded rectification with D.C. filament supplies. This unit can serve as a high end purity line stage and also a superb headphone amplifier.

Build Features:

  • No feedback design
  • Hardwired point to point.
  • Only film capacitors in the in signal path- no electrolytic
  • Choke loaded power supply
  • D.C. filament supply
  • 17db gain
  • 100k input impedance
  • LED color choice for power on and operation status
  • Maple, Cherry, Oak or Paduke ( similar to mahogany) wood choices
  • Amplifier dimensions:19x W x 14”D

Options:

  • Headphone / line front panel selector switch
  • Additional inputs / outputs
  • 240 volt configuration available on request

Pricing: MA-10B $1495.00
All prices are in USD and do not include shipping or customs duty and brokerage fees if applicable.

Shipping weight: 22lbs

MA-15

MA-15 Line Stage Pre-Amplifier with MM Phono Stage

 

 

Product ID# MA-15

$1995.00

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The MA-15 shares the identical circuit as the MA-10B line amplifier with the addition of a 4-tube M/M phono stage. This amplifier is a special proprietary designed mu-follower with a 6B10 (both sides paralleled for the lowest noise and output impedance) as the gain tube and a 6SN7 as the current source for each channel. This is an extremely stable natural sounding pre-amp that uses no feedback and has no electrolytic capacitors in the signal path- only in the power supply. The phono stage uses 2x 6922or 6N1P and two 12AT7 tubes in a special proprietary phono stage with separate regulated high voltage and D.C. filament supplies. RIAA equalization is passive with no feedback

The high voltage power supply regulator circuit uses a horizontal sweep tube followed with an oil filled capacitor. Secondary filtration with electrolytics by-passed with film caps. Regulated D.C. filament supplies are used for the 6B10’s and 6SN7’s. The front panel has a five position selector switch, mute switch, volume, balance and headphone jack. The back panel has two sets of line out (RCA) five sets of RCA inputs, IEC connector and fuse holder. Using as a headphone amplifier there is plenty of headroom with 92 volts peak to peak that will sufficiently drive any headphone from 10 – 2,000 ohm impedance. As a line pre-amp you have 17dB of gain without feedback and 30db of gain in the phono stage

To sum up, this preamp uses no feedback, no transistors; no electrolytic capacitors in the signal path, horizontal sweep tube and choke loaded rectification with D.C. filament supplies.

Build Features:

  • No feedback design
  • Hardwired point to point.
  • Only film capacitors in the in signal path- no electrolytic
  • Choke loaded power supply
  • D.C. filament supply
  • 17db gain – Line Stage
  • 30dB gain with passive RIAA equalization in the phono stage
  • 100k input impedance
  • LED color choice for power on and operation status
  • Maple, Cherry, Oak or Paduke ( similar to mahogany) wood choices
  • Amplifier dimensions:19x W x 14”D

Options:

  • Headphone / line front panel selector switch
  • Additional inputs / outputs
  • 240 volt configuration available on request

Pricing: MA-15 $1995.00
All prices are in USD and do not include shipping or customs duty and brokerage fees if applicable.

Shipping weight: 24lbs

PH-6

PH-6 Moving Magnet / Moving Coil Phono Stage

 

 

Product ID# PH-6

$1195.00

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The PH-6 has both M/M & M/C inputs with a separate power supply. Front panel input selectors for both the moving coil and moving magnet inputs. The moving coil load selector range 20/50/150/250/500/1000 and moving magnet 47/100/500/1K/10K/47k. The separate power supply supplies two well regulated high voltages to both M/M & M/C stage along with regulated D.C. filament supplies. Tube compliment 2x 6922or 6N1P and two 12AT7 tubes RIAA equalization is passive with no feedback with 30dB MM and 30dB MC gain.

Build Features:

  • No feedback design
  • Hardwired point to point.
  • Only film capacitors in the in signal path- no electrolytic
  • Choke loaded power supply
  • D.C. filament supply
  • MC 30db gain
  • MM 30dB gain with passive RIAA equalization
  • LED color choice for power on and operation status
  • Maple, Cherry, Oak or Paduke ( similar to mahogany) wood choices
  • Amplifier dimensions: 12” W x 8”D
  • Power Supply dimensions 12”W x 8”D

Options:
240 volt Mains
LED colour choice

Pricing: PH-6 $1195.00
All prices are in USD and do not include shipping or customs duty and brokerage fees if applicable.

EA-8

EA-8 Electrostatic Headphone Amplifier

 

 

Product ID# EA-1

$1895.00

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Here is the ultimate expression in electrostatic tube headphone amplification. The EA-8 replaces both the EA1 & EA-4 now using 4 12DQ6 horizontal sweep tubes configured in triode mode for the output. The inputs from your source are routed through volume / balance controls and into the first dual triode paralleled amplification stage followed by four 6CG7 dual triodes. The power supply uses high speed fast recovery diodes with choke loaded HV rails utilizing two horizontal sweep tubes for the regulated high voltage supplies. All D.C. filament supplies. Only HQ film caps are used in the signal path. The front panel has two Stax outputs, one for high bias and one for low bias that will work with virtually all Stax products – high bias, low bias and electret. If desired Sennheisser and Koss outputs can be added at no additional charge but the customer will have to supply the appropriate panel jacks. Tube compliment is 2 x 12AU7, 4x 6CG7, 6x12DQ6.

Build Features:

  • Only film capacitors in the signal path- no electrolytic capacitors (only in power supply circuits).
  • Choke loaded and regulated high voltage circuits.
  • Hardwired point to point.
  • Dimensions 19”W x 14”D

Build Options:

  • Customer options of additional output jacks- to be supplied by customer
  • Front panel choice of white or gold lettering on black
  • LED color choice for power on and operation status.
  • XLR input connectors.
  • Solid side panels in Maple, Cherry, Oak or Paduke ( similar to mahogany )
  • 240 volt configuration available on request

Pricing: EA-1 $1895.00
All prices are in USD and do not include shipping or customs duty and brokerage fees if applicable.

Shipping Weight: 28lbs