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In Reply to: RE: Dowdy choke for an headphone/preamplifier. posted by mqracing on July 07, 2016 at 14:13:09
Some times ago my friend measured the primary inductance of your tl404. He found about 27H.
So the anode choke and primary of the tl404 are in series in a parafeed design.
The total inductance isn't a great value.
But I trust you. If in your opinion the dowdy is great for my application (vt52 parafeed) i'm ready to buy a pair.
Have you got in stock a pair of dowdy chokes?Regards
Edits: 07/07/16 07/07/16Follow Ups:
The two inductors (plate choke & output trans) are in parallel.
What was the signal level and frequency that you used to measure the L? What test instrument did you use?
To get true inductance readings you really need to use a professional inductance bridge and drive the unit under test properly.
Builder of MagneQuest & Peerless transformers since 1989
Sorry for the mistake….
I thought to parallel connection but i wrote series…..
We are speaking about parafeed design…
:-)
About the measurement, ASAP i'll send you more information about instrument that my friend used.
Thank you very much Michael,
Regards
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