Vacuum Tube Sound for the 21st CenturyMapletree Audio Design offers a unique range of products designed and hand crafted by Dr. Lloyd Peppard and Dr. Al Freundorfer, both electrical engineering professors. Our goal is to foster the enjoyment of recorded music through the use of vacuum tube amplification and signal processing, offered at a reasonable price.
Click on the above tubes for more information
Headphone Amplifiers Routers and Switches
|Line 2C Line
Preamplifier (contact Lloyd
Peppard for more information)
Review of Line 2B SE by Tim Smith at wall of sound.
Line 2CRM and PS 2C with
black oak side panels shown
Premium passive components
include polypropylene film coupling capacitors
Line 2C RM available
with Bent Audio/Alps remote volume
Also availableLine 2C HT with Home Theatre bypass. A separate toggle switch routes whatever input is selected to the output completely isolated from the preamp circuitry (preamp can be powered off).
Ultra 4C Phono/Line Preamplifier (contact Lloyd Peppard for more information)
Premium passive components include polypropylene film coupling capacitors and Alps volume control.
48 dB phono gain, three 18 dB line inputs, two line outputs.
Volume and Balance controls.
2 x 12SN7GT (switchable for 6SN7GTB) and 2 x 12SC7.
Separate PS 2D power supply included.
Ultra 4C RM available with Bent Audio/Alps remote volume control.
Phono 3C Phono Preamplifier (contact Lloyd Peppard for more information)
For a number of years, customers have asked about a separate phono preamplifier that embodies the characteristics of the phono stage of the Ultra 4. The Ultra 4 is really a phono preamp with line inputs, 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 Phono 3C preamplifier incorporates the low-level gain and equalization stages of the Ultra 4C 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 that can supply the additional 5-10 dB of gain required. The Phono 3C 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 3C is designed to use a separate power supply. Normally, for stand-alone use, this is the compact PSX unit shown. However, the Phono 3C is fitted with an extra power jack on the rear panel (not shown in the photo above) to permit connection of the PS 2D power supply to both the Phono 3C and Line 2C preamps without any modification. Two switched phono inputs are provided, which can be ordered with custom loading specs. Details and full specifications can be viewed by downloading the User's Manual from the "Users Manuals" page.
SugarMaple BB (Black Buff) Line Level Buffer Stage (contact Al Freundorfer for more information)
Layout designed to facilitate tube rolling.
Sweeten the sonics of your DAC or other digital source with the Black Buff line stage. It features unity gain, 50K input impedance, less than 500 Ohms output impedance, and includes a volume control and heater voltage switch for use of either a 6SN7GT or 12SN7GT tube (supplied). Download the User's Manual for complete specs.
Note: Images are shown for example only. Chassis and layout are selected to meet specific customer requirements.
Customers often have specific requirements that can be met with custom features and/or modifications to existing Mapletree products. Usually, these can be accommodated at nominal extra cost. The most modifiable components are those disigned to route signals and/or reconfigure system components, namely the LR 1 Line Router, the SP 1 Amplifier/Speaker Selector, and the SCC 1 System Configuration Controller. Here is a brief summary of what is available. More information can be obtained from the Branches 7 Newsletter.
LR 1 Line Router - The standard version is designed to switch one of up to three input stereo signals to one of up to three outputs. Other configurations are available to handle up to 6 inputs and/or outputs. Chassis sizes are chosen to accommodate the required I/O connections. As with all the Mapletree switching components, RCA jacks are high quality gold plated with inside and outside hex nuts, switches are Lorlin or C&K enclosed rotary types with silver-plated contacts, and wiring is silver-plated stranded copper with Teflon insulation.
Custom LR 1 for phono cartridge switching (4 inputs/2 outputs)
LR 1 Pro Line Router - This is a balanced signal version of the LR 1. The standard model can switch up to 3 inputs and 3 outputs. Additional I/O can be accommodated using special multi-deck rotary switches. XLR connectors are Neutrik gold-plated type with locking tabs on the female version.
Custom LR 1 Pro with 4 inputs and one output.
"I received the switch [LR 1 Pro] today and it is exactly what I wanted and works perfectly - no noise at all when switching. I have bypassed my preamp for my DAC and LPs and have a sonic improvement".
SP 1 Amplifier/Speaker Selector - The simplest (standard) version switches the stereo output of a power amplifier to one of two (or both) speaker systems. A typical modification is the addition of a switch for one or more amplifier outputs. All switches handling amplifier output or speaker connections are high-current rated versions of those employed in the LR 1 line router All amplifier inputs are terminated with 500 Ohm resistors and binding posts are heavy-duty 5-way dual units. A simplified schematic representation of the I/O and switching functions as printed on the top of the chassis.
Custom SP 1 switching 3 amplifiers to one or more of 3 speaker systems
SCC 1 System Configuration Controller - This is a custom combination of the LR 1 and SP 1 that allows switching of several sources to one or more preamps or headphone amplifier, preamp outputs to one or more power amplifier inputs, and power amplifier outputs to one or more speaker systems.
"[The SCC 1 is] simple elegant and effective. Does exactly what I needed it to do and has significantly reduced the effort involved in switching between components. Just a wonderful product".
Custom SCC 1 that handles 3 sources, two preamps, a headphone amplifier, 2 power amplifiers, and 3 speaker systems. Chassis ia 6" x 17" x 3".
For more information or to place an order, please telephone or email Lloyd Peppard or Al Freundorfer as referenced for each product or refer to price list tab
Telephone: (613) 387-3830
Lloyd Peppard: firstname.lastname@example.org
Al Freundorfer: email@example.com