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In Reply to: RE: Tube loading chokes? posted by kobasa@xs4all.nl on February 07, 2021 at 12:15:31
The normalized parameter is L/R and this choke is in the normal range. The maximum DC voltage drop is 27v, about the same as the Hammond 156C (150H, 8mA, 3700 ohms) or Magnequest BCP-15 (50H, 40mA, 40mA IIRC)
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'The Mind has No Firewall~ U.S. Army War College
Edits: 02/07/21 03/03/21 03/03/21
By "normal range" I mean typical of the plate chokes I have measured or seen measurements of.
Windings are interesting. The L/R ratio is a function of the core and gap, but any winding of the same copper mass will have the same L/R. So if you have 225 henries at 1850 ohms, you could use thicker wire on the same core and get 22.5 henries at 185 ohms. (That's a 3.5 pound choke, in the Hammond catalog.)
If you do layer winding, the self-capacitance is mostly between adjacent layers, and they are in series. More layers, less capacitance. Of course there is winding to core capacitance too, and it may dominate since it's in parallel. But many turns is not necessarily a capacitance problem.
This is not true. Turn-to-turn capacitance dominates, not layer-to-layer.
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The Mind has No Firewall~ U.S. Army War College ber.
Edits: 02/08/21 03/03/21
I picked up a bunch of chokes 70H @ 2.3K not long ago. The response is extremely flat, no unwanted responses, and they've proven to be excellent for this use. The DCR is absolutely not an issue.
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Buy Chinese. Bury freedom.
The Mind has No Firewall~ U.S. Army War College
Edits: 03/03/21 03/03/21
I used several types in actual testing, but you can calculate or simulate the same. My point was that huge inductance and extremely low DCR aren't required in order to achieve good performance. That's based on the use of relatively low-Rp tubes of course, not something like a 12AX7. :)
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Buy Chinese. Bury freedom.
The Mind has No Firewall~ U.S. Army War College
Edits: 02/13/21 02/13/21 03/03/21
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