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In Reply to: 'Tube sound' can be very misleading. posted by andy evans on December 14, 2015 at 09:20:39:
All very true; but nearly all tube amps have a relatively high source impedance due to the output transformer. My own experiments, and some calculations tell me that at least 70% of the difference between tube amp with output transformers and direct coupled SS amps lies with the higher source impedance of the tube amps. The other 30% or so must lie somewhere else. A lot of candidates for that remaining 30% have been suggested; but many don't hold up.
One of the differences is that many tube amps have no input coupling cap, and the input goes directly to a tube's control grid, so you have a very high input impedance and minimal interaction with the preamp and interconnect's properties.
Film caps are a good idea in tube amps; but not practical in SS amps. I do add bypass caps to my power supply caps in my SS amps, and some commercial amps I have already had them.
It's good this thread is getting lots of opinions - that's why I posted in the first place.
Jerry
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Follow Ups
- RE: 'Tube sound' can be very misleading. - Bold Eagle 18:41:15 12/15/15 (2)
- Transformers and SIT amps - andy evans 03:44:17 12/16/15 (1)
- RE: Transformers and SIT amps - Bold Eagle 19:16:55 12/16/15 (0)
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