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In Reply to: RE: has anyone tried silk gridchoke for pp phasesplitter? posted by amnesiac on July 20, 2015 at 07:30:50
Both my line stage and power amps (fully balanced differential) use Lundahl input transformers. In both instances the balanced input connection is made on the transformers secondary. In essence using the transformer's secondary as a center tapped grid choke. In that context a CT grid choke works well. I am not sure how a CT grid choke could be used to effect phase splitting. Perhaps someone out there could explain how this would work. I'd be interested to learn.
"It is better to remain silent and thought a fool, then speak and remove all doubt." A. Lincoln
Follow Ups:
A CT grid choke can be wired as a 1:1 inverting transformer and if you use the "primary" of this transformer as a grid choke you get an inverted signal from the secondary. Both Jack at EP and Mike at MQ offer devices specifically for this situation.
dave
I always wanted to ask you ...
How is that different than a 1:1 transformer
with L5 as the primary and L6 the secondary?
DanL
It isn't any different. It is a 1:1 inverting transformer with the grounds internally connected.
dave
The Silk has a dual chamber bobbin . Would this still be good as a phase splitter ?
Al
I can say that a simple split bobbin choke used as an inverting IT has horrible behavior. I think Mike did some additional interleaving on the EXO-173 to come up with the 173pps for this specific use.
dave
I might ask of the magnequest forum.
Does mean NO signal to other phase? it just said on the add that is was suitable for pp amp use. Perhaps they meant in a different way. Lucky I asked first :)
Any advantages or disadvantages vis a v. an IT?
"It is better to remain silent and thought a fool, then speak and remove all doubt." A. Lincoln
your taking the magnetics out of the drive. it is the sound of a cap coupled grid choke loaded stage verses a transformer coupled stage. I was hoping to get better bandwidth and more direct sound. The silk is designed for such use I don't want to be the first guy here to try it.
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