Vacuum Tube
OTL-20 Stereo Amplifier
Part # VT-OTL-20

** PLEASE NOTE ** We are sold out of the OTL Stereo Amp.  If you are still interested purchasing a unit, please contact us.

Contents
Product Summary
Key Features
Specifications
Bottom View
Ordering Information
 

Product Summary

       Unlike the original circuit that used 3 ea. 6082 vacuum tubes in parallel for the output stage, this design uses 10 ea. 6AS7 / 6080 tubes in parallel for each channel (In 1954, it was a single mono amplifier.  The 6082 is the same as the 6AS7 / 6080 except for heater voltage.)  This allows for the use of less overall feedback and the elimination of an additional 12AT7 driver stage resulting in a considerable increase in power with the ability to drive a 4 Ohm speaker load.  The driver tube heaters are powered from a small DC supply.

       High quality, conservatively rated components are used for reliability and long life.  Output stage DC balance is easily adjusted with a single control for each channel.  LED indicators are provided to make this adjustment easy.  Terminals are provided so that feedback may be taken directly from the speaker, this includes the speaker wiring within the feedback loop (optional).

       Speaker and amplifier protection is provided by 10 fuses.  If any one of the 10 should blow, the amplifier is quickly shut down and the blown fuse is indicated by one of 10 LED's.

       The amplifier is relay controlled and may be switched on and off from a preamp, switched outlet.  It may be turned on and off directly at the amplifier as well.

       The conservative component ratings and heavy-duty, reliable construction may make this OTL amplifier ideal for disco sound and guitar applications as well as home stereo installations.

       Comes supplied with: Instruction and service packet, IEC power cord, control power cord, fuse puller and spare fuses.

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Key Features

• Four high quality industrial circuit boards are used for the output stage, power supply, fuse and LED indicator circuit boards
• The driver stages are built on four turret style industrial quality boards, this allows for changes that the audio experimenter may wish to try out
• High temperature, Teflon insulated wire is used for all interconnect wires
• Chassis is finished, inside and out with a durable, powder coat finish
• Driver stage uses a 12AT7 (Mullard) and a 12SN7GTA (GE) in each channel (two 6SN7's may be used in place of the 12SN7's with a simple wiring change) Output stages use twenty 6AS7GA (GE) tubes

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Specifications

• Frequency Response: 10 Hz to 50 Khz
• Power Output (both channels driven):
       ~ 75 Watts, 4 Ohm load
       ~ 100 Watts, 8 Ohm load 
• Input Sensitivity: 1.75 VAC input = full power output
• Input impedance: 500K
• Power requirements: 110-125 VAC 60 Hz
• Dimensions: 23" x 17" x 6" US
• Weight: 50 Lbs. (22.68 Kg.)
• Color: Many colors to choose from (Powder Coated)

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Bottom View

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Ordering Information

To place an order for the Vacuum Tube OTL Stereo Amplifier; Part # VT-OTL-20, click here to contact us.

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