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In Reply to: RE: Brook 12A plate load choke? posted by dave slagle on January 21, 2015 at 10:55:08
Thanks, Dave.
It was your examination and posted results on this choke that made me think that this replacement part was built based on misinterpreted data.
So, now, I guess I'm going to have to return this one and keep looking.
Follow Ups:
Magnequest had one at one time; I don't know if Mike still considers that a "current product".
Hi Paul:
We still build the EXO-173 CT choke\phase splitter. It is based on the center tapped choke that was used in the Altec 1570B amplifier (part #17173).
MSL
Builder of MagneQuest & Peerless transformers since 1989
Ooohh - a somewhat different application!
In the Altec 1570 the 17173 was used in the cathode circuit of a pair of push-pull drivers to the output stage.
It will work well as a center tapped plate choke. It is spec'd at 250 Henries when built on M6. A higher perm material like nickel will
produce much,much greater L.
And it is inherently balanced btwn the two winding halves on both the DCR as well as L fronts. The two ends of the winding also have balanced capacitances to ground (ct).
MSL
Builder of MagneQuest & Peerless transformers since 1989
That's good - I estimate a 10Hz cutoff with 6SN7s. As long as it will also handle 42vRMS each side (84v end to end) down to (say) 30Hz than it should be fine in the Brook design.
This might work depending on the "gap" that you require.
"It is better to remain silent and thought a fool, then speak and remove all doubt." A. Lincoln
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