SE-32P : Single Ended Class A Stereo Power Amplifier |
|
Description: 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 6922/6ES8 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 a plate load resistor 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 connects to 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 EL504 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 is used. 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. The 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, IEC input with 5 way binding posts, ceramic tube sockets with NOS tubes. |
|
Build Features:
Build Options:
Pricing: SE-32P $1699.00 Shipping Weight: 46lbs. |
|
| SE44 : Single Ended Class A Stereo Amplifier Using Horizontal Output Tubes Paralleled in Triode Mode with 22 Watts per Channel and separate power supply chassis |
|
Description: The SE44 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 an improved Mu follower design that utilizes a 6LU6 as the voltage amplifier (triode section) and ( pentode) section as the constant current source. This is a true constant current source that has more than enough gain to properly respond to the small signal / voltage changes without a resistor dropping large amounts of voltage typically in standard Mu follower designs. Additionally a driver stage has been included which is a critical factor to ensure excellent low end response and a quick rise time. The driver stage uses a 6/12SN7 of 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 which are high quality polypropylene. The output stage for each channel consists of four 12GE5 or horizontal sweep tubes paralleled in triode mode with class A operation. 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 is used. The negative voltage is adjustable and fed to the control grid of the output tube that determines the current flow and class of operation. 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 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 directly 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. Quality Ceramic tube sockets, point to point wiring, IEC input, 5 way binding posts and NOS tubes complete the package. All tubes are NOS with 13 tube compliment of 2X6LU6, 2X6/12SN7, 8X12GE5 and 1X6AX4 thermal delay tube. This unit comes with a one year warranty parts and labour except the tubes that are covered for 90 days. |
|
Build Features:
Build Options:
Pricing: SE-44 $2299 |
|
| PP 150-8
: 150 Watt Stereo Tube Amplifier with Separate Power Supply Chassis |
|
Product ID: PP 150-8
|
Description: The PP150-8 stereo power amplifier is identical in circuitry to my PP-150 utilizing 8 horizontal sweep tubes in the output stage producing 75 watts per channel. The bar is raised using four output tubes per channel instead of two lowering the AC plate resistance allowing a different output transformer turns ratio. 12EM7/12EA7 dual triodes are used for the input, phase slitter and driver stages and 12DQ6/6GW6 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 theECC83. 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. 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, 8 x 12DQ6 / 6GW6 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:
Build Options:
Pricing: PP150-8 $2250.00
Shipping weight: a) amplifier 49lbs b) power supply 25lbs |
|
| PP 150V-8 | |
Product ID ; 150V-8
|
Description: This model is identical to the PP150-8 above, but with an added volume control. |
| MB-130 Mono block power amplifiers with two Separate Power Supply Chassis |
|
Product ID: MB-130
|
Description: The MB-130 mono block amplifiers share the same circuitry as my PP150 designs but are dual mono with 6 output tubes per channel producing 130 watts per amplifier. 12EM7 dual triodes are used for the input, phase slitter and driver stages and EL504/PL504 27GB5 horizontal tubes for the output stage. Bias is derived from a separate source and is well regulated with external top mounted adjustments following Fixed negative bias supplies connect the output tube cathode to ground and have an additional negative voltage power supply. The negative voltage is adjustable and fed to the control grid of the output tube that determines the current flow and class of operation. 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 as a dual triode with one section similar to the 6SN7 but with a 10 watt plate dissipation and the other similar to theECC83. In each channel the two 12EA7 sections do the first stage gain and phase splitting while the second 10 watt sections accomplish the drive for each output tube. Bias voltage is from a separate supply and well regulated. 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 2 x 15,000uf 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%. Each mono block power supply comes complete with a detachable power cord and an IEC input. Ceramic tube sockets, NOS tubes, instruction manual with bias instructions. Tube compliment for each mono block 2x 12EA7 / 12EM7, 6x EL504/PL504 27GB5 and 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:
Build Options:
Pricing: MB-130 $4499.00 per pair |
|
| MB-130S | |
Product ID: MB-130S
|
Description: This model is identical to the MB-130 above, but has a polished stainless steel chassis. |
| PL-10B Custom Triode Line/Headphone Amp | |
Product ID: PL-10B
|
Description: Here is a custom built line level pre-amp & headphone amplifier. This amplifier is a special proprietary designed mu-follower with a 6CG7 (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 feeding a large choke coil. Secondary filtration with electrolytics by-passed with film caps. Regulated D.C. filament supplies are used for the 6CG7’s and6SN7’s. The front panel has a four position selector switch, mute switch, volume, balance and two headphone jacks. 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. This unit comes with all new or NOS tubes 2x 6CG7, 2x 6SN7 and a 12BQ6 regulator tube, detachable power cord and instructions. One year warranty parts and labour except the tubes that are covered for 90 days. |
Build Features:
Options:
Pricing:PL10 $1199.00 Shipping weight: 22lbs |
|
| PL-15 | |
Product ID: PL-15
|
Description: The PL-15 shares the identical circuit as the PL-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 6CG7 (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 The high voltage power supply regulator circuit uses a horizontal sweep tube followed with an oil filled capacitor feeding a large choke coil. Secondary filtration with electrolytics by-passed with film caps. Regulated D.C. filament supplies are used for the 6CG7’s and 6SN7’s. The front panel has a five position selector switch, mute switch, volume, balance and two headphone jacks. 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. This unit can serve as a high end purity pre-amp and also a superb headphone amplifier. This unit comes with all new or NOS tubes 2x 6CG7, 2x 6SN7, 2x 6922, 2x 12AT7 and a 12BQ6 regulator tube, detachable power cord and instructions. One year warranty parts and labour except the tubes that are covered for 90 days. |
Build Features:
Options:
Pricing: PL15 $1699.00 |
|
| PL-15S | |
Product ID: PL-15S
|
Description: This model is identical to the PL-15 above, but has a polished stainless steel chassis. |
| PH-6 Moving Magnet / Moving Coil Phono Stage | |
Product ID: PH-6
|
Description: 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 amplifiers and all filament voltages are also regulated D.C. Tube compliment 4x 6922, 2x 12AT7. Unit is supplied with detachable power cord and instructions. One year warranty parts and labour except the tubes that are covered for 90 days. |
Build Features:
Pricing: PH-6 $849.00 |
|
| DA-6 | |
Product ID: DA-6
|
Description: This non-oversampling DAC is a completely new product and exists due to my acceptance of the superb sonic characteristics possible and in my opinion is vastly superior to upsampling methods. With 1x oversampling clock jitter stability is a non issue and you receive a very natural, musical, jitter free sound. The DA-6 incorporates transformer coupling on the input and also on the two 1865 DAC’s into my tube stage. Transformer coupling is absolutely critical as it provides complete isolation of digital noise, ground bounce between the digital and analogue circuits. There are 6 isolated power supplies supplying the digital & analogue DAC circuits, high voltage tube and filament supplies. The power supplies are in a separate chassis and connected through a military grade umbilical cord. The DAC circuit is completely point to point in construction and incorporates the Crystal CS8414 input receiver and two AD1865N DAC chips. A front selector switch selects one of two digital 75ohm inputs and also a USB input. Please note the unit pictured does not have a USB input but it will be included on future production units. The four tube output stage is similar in design to the PL-10B ( see description ) so is exceptional with headphones. The volume control can be switched out of the circuit, the DAC output is fixed at 2.2 volts in this mode. |
Build Features:
Pricing: DA-6 $1699.00 Shipping weight: 18lbs |
|
| EA-8 | |
Product ID: EA-8
|
Description: Here is the ultimate expression in electrostatic tube 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. All tubes are NOS with 10 hours burn in. |
Build Features:
Build Options:
Pricing: EA-1 $1799.00 Shipping Weight: 28lbs |
|
| PP-150 Special with polished aluminium and copper sub chassis with Separate Power Supply Chassis |
|
Product ID: PP-150 special
|
Description: Here is a very unique PP-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 theECC83. 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:
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 |
|
|
|
||||||||||||||
|
||||||||||||||
