Vacuum Tube Sound for the 21st Century

Mapletree Audio Design offers a unique range of products designed and hand crafted by Dr. Lloyd Peppard, a retired electronics engineering professor. The goal is to increase your enjoyment of recorded music through the use of vacuum tube amplification and signal processing. 




Click on these tubes for more information!





Quick Find:    Headphone Amplifiers   |   Preamplifiers  |   Other Products (line routers, Dynaco driver boards, power amplifiers, crossovers)



Customer Photo of the Month:
    

Kelly Samel: HD300 Limited Edition used with PS1000, RS1i and LCD-2 headphones.
 







NEW PRODUCT LINE: SugarMaple

Over the next year or so, Mapletree Audio Design Associate, Dr. Al Freundorfer, will be offering new designs an
d innovative re-working of existing Mapletree products under the SugarMaple banner. The first new product is the OD300 (Octal Duo) Headphone Amplifier. It uses the same output tube as the HD300 above (6080, special 6AS7G) but with a 6SL7 triode driver stage. Polypropylene output caps are standard and circuit refinements ensure a flat frequency response form 20 Hz to 20000 kHz. The high output power (over 1 W into 16 Ohms!) and low driving impedance of the 6080 easily handles any headphone sensitivity and impedance characteristic. As an introductory special, the SugarMaple OD300 with power supply is priced at $900 with free shipping to N. America. For more details and complete specifications, you can download the User's Manual.

Alternate corner design is available as shown below.



"The OD300 sounds great after settling in and combines musical dynamism with a lovely euphonic quality."


SNEAK PREVIEW: SugarMaple BlackBuffer










A tube buffer stage for your DAC or other digital source. Unity gain with volume control, 100K input impedance, <500 Ohms output impedance. Uses 6SN7GT or 12SN7GT tube.

New product: Phono 3 Preamplifier–part of the Mapletree Modular Series

For a number of years, customers have asked about a phono preamplifier that embodies just the phono stage of the Ultra 4. The issue was always that the Ultra 4 was really a phono preamp with line inputs, so there was little price or sonic advantage in going to a dedicated phono version of the Ultra 4 by omitting the volume/balance controls and source selector switch. The phono gain of the Ultra 4 is around 48 dB which is suitable for MM cartridges driving a typical tube or solid-state power amplifier. The new Phono 3 preamplifier incorporates the low-level gain and equalization stages of the Ultra 4 without the output buffer and with around 10 dB less gain. Thus, it is suited to drive the line input of a preamp or integrated amplifier with at least 5-10 dB of additional gain. The Phono 3 output has a driving impedance of around 2.5 kOhms, which can drive a reasonable length of interconnect without compromising the high frequency response. Noise at full output is less than 2 mV. Like the other Mapletree preamps, the Phono 3 is designed to use a separate power supply. Normally, this is the PSX unit that powers the L2X line preamp. However, the new PS 2a power supply can be ordered if sharing the power supply with the Line 2B preamp is desired. For those customers who have a Line 2 preamp and wish to add phono capability, existing PS 2 power supplies can be modified to PS 2a configuration at a nominal cost. Two switched phono inputs are provided, which can be ordered with custom loading specs. A power switch on the rear panel allows powering down the Phono 3 when just the Line 2 preamp is needed in a shared PS2a setup. Details and full specifications can be viewed by downloading the User's Manual from the "Users Manuals" page. A full description of the preamp/power supply options for the Mapletree Modular Series is shown below.



Modular Series Components

The Mapletree Modular Series of components includes the Line 2B, L2X, Ultra 4B, and Phono 3 preamps, the PSX, PS2, and PS2a power supplies, and the LR 1 and LR 1 Pro line routers. The following chart shows some typical configuration examples. Configuration (a) shows a Phono 3 with PSX power supply feeding an existing line preamp or integrated amp; configuration (b) shows  Phono 3 and Line 2B preamps sharaing a common PS 2a power supply; configuration (c) provides both phono and line preamplification with an Ultra 4B preamp powered by the PS 2 power supply; configuration (d) shows a Line 2B feeding an LR 1 line router to direct the output to either a power amp or a headphone amp; configuration (e) provides line level preamplification with a L2X line preamp and PSX power supply. The L2X can be configured for unity gain if no preamplification is required to drive the power amp(s).






Mapletree Audio Design Product Overview

Go to:   Preamps  •  Headphone Amps   •  Other products (Power amps, Dynaco ST70 driver module, Magic Eye monitors, Line Routers)

NOTE: All MAD components, with the exception of the Super Stealth and Stealth Max power amplifiers, are available for 230-240 VAC 50 Hz at no extra cost. Super Stealth and Stealth Max monoblocs for 230-240 VAC are available at a slightly higher price.  

Chassis colors include RCA red, textured black, Sylvania yellow, eggshell white, cobalt blue, and sage green. Side panels are available in black or stained oak.




Preamplifiers





Line 2B SE Line Preamplifier 

Reviews   
Customer feedback



• Premium passive components include Auricap XO polypropylene film coupling capacitors and Alps volume control.
• Optimized circuitry for lowest distortion and noise.
• 3 inputs, 2 outputs, volume and balance control.
• 2 x 12SN7GT with switch for 6SN7GT tubes.
• Separate PS 2 power supply (with 6X5GT tube/fast diode hybrid rectification) included.

Also available—Line 2B HT with Home Theater bypass. The source input switch is modified to select Line1, Line2, or HT. In HT mode, Line2 (front channels) is routed to the output completely isolated from the preamp
circuitry (preamp can be powered off).

                               
NEW!   Alternative styling for Line 2B/PS 2/Ultra 4B/LR 1. If wood side panels aren't your first choice, consider an anodized aluminum front panel as shown her for a Line 2B/PS 2. Black chassis only.
    




L2X Line Preamplifier/Buffer with PSX Power Supply

 

The L2X preamp with the PSX power supply offers a "best value" option that rivals the performance of the Line 2B SE. The differences are in some of the components used (Alpha carbon potentiometer instead of Alps, Nichicon polypropylene film caps instead of Auricaps). There are also some simplifications in the physical layout and appearance (no heater voltage switch and no balance control), none of which has impact on the sonic character. There are two inputs with a selector switch located on the rear panel. Inputs can be individually configured for gains of either 10 dB or 0 dB (unity gain, for use as a buffer). The compact PSX power supply employs solid state rectification (with high speed diodes) and a dc heater supply. The basic specs for the L2X are identical to those of the Line 2B SE.





Ultra 4B SE Phono/Line Preamplifier

Reviews
Customer feedback


Shown above in Cobalt Blue

Sage Green

Ultra 4B SE features:

• Premium passive components include
Auricap XO polypropylene film coupling capacitors and Alps volume control.
• 48 dB phono gain, two 18 dB line inputs, two line outputs.
• Volume and Balance controls.
• 2 x 12SN7GT (switchable for 6SN7GT) and 2 x 12SC7.
• Separate PS 2 power supply included.
(Shown in sage green finish)


PS 2 Power Supply features:

•  Outputs of  12 VDC@1A (regulated) and +200 VDC@15 mA.

•  Power cable and detachable IEC line cord. 
•  High-speed diodes with 6X5GT rectifier tube in hybrid bridge rectifier (Soft startup relieves stress on tubes and filter capacitors).







Headphone Amplifiers






"Now I have to listen to all my CDs all over again. I have a decent stereo system but with the Ear+ it sounds like a $20,000 setup".

Reviews
Customer feedback 





Ear+ HD Super II  Headphone Amplifier.

 The use of  6BQ5/EL84 output tubes in the Ear+ HD250 was popular with customers who appreciated the wide availability of the type. Like the HD250, the new HD Super II  utilizes the EL84 with triode connection in cathode follower mode (as is the 12B4A in the Ear+ HD). The 12AX7/5751 drivers are configured in SRPP topology. The power supply is constructed on a separate chassis to obtain the lowest possible noise floor and to minimize heat buildup in the main amplifier chassis, thus increasing component life expectancy. Both units are a compact 5" wide. Appearance is distinctive with brushed aluminum and chrome trim.  Wood side panels are not available as both chassis have ventilation holes along the sides. The two chassis can be stacked, positioned side by side or even located on different shelves. A 1 ft power interconnect cable is supplied; longer cables can be requested. Available with 240 VAC wiring at no extra cost.




Passive preamp option  provides three inputs and a passive output.



Now Available: Remote volume control module for HD Super II.
Bent Audio motorized Alps potentiometer or DACT stepped attenuator options.
Provides 4 inputs, source output, and passive preamp output. Please inquire about price and package options.




Ear+ HD High Definition Headphone Amplifier

Reviews
Customer feedback


Now available with Panasonic polypropylene film  output caps option ($40).                                             Also available with white/yellow/blue/green chassis and brushed Aluminum front panel.

• Outstanding performance with a wide range of headphone impedances and drive requirements.
• 2 x 12B4A NOS and 1 x 5751/12AX7/ECC83 tubes.
• High and low impedance headhone jacks.
• Premium passive components include Audio Note Tantalum film plate resistors and Alps volume control.
• Ultra high-speed rectifier diodes.
• Line output for use as a passive preamp.
• Dual inputs for easy patching into system.
 





Contact Information





Dr. P spins some 78s on his mini system. Photo by Christian Keresztes
For more information or to place an order, please telephone or email Lloyd Peppard at
(613) 387-3830
lloydpeppard@yahoo.ca

Lloyd Peppard
Mapletree Audio Design
158 Seabrooke Rd
R.R. 1, Seeley's Bay, Ontario, Canada K0H 2N0

PayPal LogoCredit card payments through PayPal are highly recommended. Registered PayPal email address is lloydpeppard@yahoo.ca






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