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output stage's Gm, we get 2Gm.
Using the Williamson Front End
Like the Split Load phase splitter, the Differential amplifier can be tweaked to deliver an unbalanced output that ultimately balances the output stage. Once again a capacitor bridges output to one phase of the output that feeds the output tubes. The purpose is to sample the output voltage so that tube T1's grid-to-cathode voltage matches that of T2. As the output moves in anti-phase to T1's grid signal, the output signal will subtract from the
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input voltage presented to T1.
The output stage in the schematic below functions like a Cathode Follower. Any attempt to force T2's cathode negatively from its idle voltage, will cause T2 to conduct more, thus pulling its cathode upward; while a negative pulse relayed to T1's grid through the capacitor C will cause T1 to conduct less, thus pushing its plate upward, which will force the output more positive.
Next time: a class in Circular amplifier CLASSES
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High gain Circular/Bridge/Balanced amplifier with a Williamson amplifier input stage.
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Over 10,000 square feet of:
Tubes, books, transformers, sockets, friendly folks, capacitors, resistors, literature, cabinet restoration materials, friendly folks, wire, grill cloth, gifts, tools, information...and did we mention the friendly folks?
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68 pages of products and information (most of which is also available on our web site). It's all here!
tubesandmore.com
Or e-mail us.
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Get our 1999 catalog
absolutely free!
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www.tubecad.com Copyright © 1999 GlassWare All Rights Reserved
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