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In Reply to: RE: Pentode vs. Ultra Linear posted by banpuku on April 19, 2015 at 08:59:47:
Check out the link provided. It explains all the deltas in detail.
Here's the bottom line:
" In a power amplifier with pentode output tubes (6L6GC, EL34, 6550, etc.), output impedance and power depend on the screen grid connection. The three standard connections are:
Pentode: The screen grids are connected to a constant high voltage source.
Triode: The screen grids are connected to the plates. Its performance characteristics are those of a triode; hence it is a triode in all but name.
Ultra-linear (UL): The screen grids are connected to output transformer taps intermediate (about 40% of the way) between the center and plate taps.
The following table compares conventional expectations with PSpice simulations for the Local Hero amplifier, changing only the output tube screen grid connections. "
Hope this helps.
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Satchel Paige
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- RE: Pentode vs. Ultra Linear - Freo-1 13:34:09 04/19/15 (0)
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