Mapletree
Audio Design
Special
Red Driver Module for Dynaco Stereo 70
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An
all-octal drop in replacement boad for the ST70
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Low
distortion NOS and current manufacture octal tubes 2x6SJ7, 2x6SL7GT.
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Mullard
circuit topology with pentode voltage amplifier and cathode coupled phase
inverter.
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High
gain, direct coupled circuit enables 20 dB of negative feedback with 80o
phase
margin.
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All
point-to-point wiring with external connections made to silver-plated turrets.
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High
quality components are used throughout: Metal film resistors, polypropylene
and polystyrene film and silver mica capacitors.
Complete
instructions and wiring diagrams for installation in a stock ST70.
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Specifications:
Input resistance: 430 kOhms. Sensitivity for full power output: 0.9
V. Available output drive voltage: >60 V p-p. Feedback: 20 dB with 80o
phase margin. Open loop bandwidth: 4.5 kHz. Closed loop bandwidth: 60 kHz.
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| Email
enquiries to Lloyd Peppard at info@mapletreeaudio.com
or phone (613) 387-3830 |