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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: Sharing cathode resistors...your opinion. posted by Iczerman on October 10, 2024 at 08:04:39:
Sharing a cathode resistor between channels always seems to cause greater distortion. It might also limit power a bit. The resistor, in any case, must be properly bypassed at audio frequencies.
A good example if you want to see this in action is the Dynaco SCA-35. There are mods to that amp that eliminate this 'problem'. You can see one example of what this mod does at the link.
The problem you are up against is cathode bias. It might be OK for one power tube or a pair of matched tubes, but its never going to be prefect. IMO you might be better off if instead the cathodes were simply grounded and fixed grid bias used instead.
In a driver circuit the extra resistor needed for a stereo situation is trivial so I see no point in going further since it is a compromise.
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- Higher distortion - Ralph 08:53:55 10/11/24 (0)
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