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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: Some of a PP amp's circuitry is balanced--the driver and output stages. posted by jeffreybehr on January 29, 2007 at 10:35:00:
It's relatively easy to stack a few differential pairs one after the other, particularly with CCSs under them. And just as easy to have a switchable balanced or SE input - just ground one grid of the first diff pair for the SE input(s).
With cheap valves, doesn't even cost much more. It does start to get expensive, however, when you use expensive valves and coupling caps.
Against that stepped attenuators have half the parts if you use them in shunt. Another virtue of balanced is lower noise with DHT small tubes. Really deserves to be more widely used.
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Follow Ups
- Balanced isn't too complex, but more parts!! - andy evans 10:47:45 01/29/07 (0)
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