In Reply to: Capacitor or transformer coupling? posted by Tube Tourist on January 22, 2012 at 02:57:52:
Personally, I will never build another RC coupled amplifier. Power triodes need a low impedance path to ground in order to prevent "blocking distortion" where electrons build up on the grid upsetting the bias and causing distortion. IT coupling does provide the necessary path for grid current but introduces other limitations and challenges. A very good quality transformer is required for the best sound.
I believe (and everyone has their own opinion) that direct coupling solves the issues with both RC and IT coupling. For more information search on "DRD amplifier" and "300B monkey amplifier"
Below is the classic Komuro direct coupled amplifier with "stacked supplies."
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Follow Ups
- RE: Capacitor or transformer coupling? - Palustris 07:10:24 01/22/12 (1)
- I agree, neither one - bwb 12:45:47 01/22/12 (0)