Stereo Circlotron OTL Project
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Stereo Circlotron OTL Project

Stereo Circlotron OTL Project

Description:

Published: October 11, 2018 0 0 217
By: Joseph Erdy, Cal Poly San Luis Obispo
Category: Engineering
Hashtags: #Amplifier #amplifiers #Analog #AnalogCircuitDesign #analoghardware #audioamp #audiodesign #Circuit #CircuitDesign #circuitproject #Circuitry #Circuits #circuitsandelectronics #Design #Drafting #Eagle #EagleCad #Electrical #Electronic #electrontube #Engineering #hifi #highvoltage #MechanicalEngineering #Music #music_production #OTL #productcreation #ProductDesign #Project #Prototype #prototypes #Prototyping #Schematic #solder #Soldering #Solidworks #stereo #tube #Tubes #vacuumtubeaudio #vacuumtubes

This stereo OTL tube amplifier project is a continuation of my experiments with the circlotron output topology. Originally conceived as a pair of monoblock amplifiers, this design combines the two separate channels on a single chassis. The output to stereo 8 Ohm speakers is driven by 20 21LG6A (10 per channel, 5 paralleled tubes per phase). The connection is direct-coupled for accurate and uncolored hi-fi audio reproduction. The pre-amp section is a high gain tube amplifier built around triode-coupled negative feedback. The distortion figures are below 0.001% THD (at 1000Hz) at a gain of over 300 mV/mV. The pre-amp is capable of driving the output into class AB2 at power levels in excess of 70 Watts per channel. The chassis will be custom-made in the style of my previous amplifiers, using wood paneling with a milled aluminum top plate.