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Tube DIY Asylum Do It Yourself (DIY) paradise for tube and SET project builders. |
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Tube DIY Asylum Do It Yourself (DIY) paradise for tube and SET project builders. |
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In Reply to: Music Angel Schematic posted by Michael Samra on January 18, 2017 at 20:07:14:
This thing is pretty basic:
The coupling caps are all 0.1, no attempt to spread out poles by using different value caps. 221k grid resistors are really high for fixed bias, I think KT88 datasheet says max. 100k for fixed bias. BAD. Potential for thermal runaway of output tubes.
No compensation components for the feedback circuit, control bandwidth, etc.
The voltage divider on the input looks like cheese too, to make up for the amplifier having too much gain to begin with.
Single fixed bias pot, no chance to balance current if output tubes slightly mismatched.
Looks to me like someone took a williamson and removed all the intelligence from it.. I wouldn't buy this amp, there's too many designs out there by people who took more interest in what they were doing.
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- Looks like they need a better engineer - maxhifi 13:20:19 01/19/17 (0)
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