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In Reply to: RE: Purpose of these Caps? posted by JKT on August 28, 2016 at 13:18:10
That's the sort of reference I was hoping for! I guess now I don't see this technique as being overly useful. Innovative in its day, but I don't like the caps in the signal path. Choke coupling off the cathodes can serve the same purpose, and like the IT, there's no risk to the outputs if the drivers open.Thanks for the info!
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Buy Chinese. Bury freedom.
Edits: 08/28/16Follow Ups:
As an alternative they show that two separate inductors can be used (e.g. the primaries of two output transformers with their secondaries left unconnected). The claim in the book is that if the bridging caps are left off of the IT transformer transient oscillations often occur with the incidence of grid current.
"It is better to remain silent and thought a fool, then speak and remove all doubt." A. Lincoln
"The claim in the book is that if the bridging caps are left off of the IT transformer transient oscillations often occur with the incidence of grid current."
That doesn't surprise me. There's no dampening at the grids without the AC connection back to the cathodes. The more I look at it, the less I like this circuit. If I had this model Fisher, I'd be very tempted to eliminate the secondary connections altogether.
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Buy Chinese. Bury freedom.
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