Old OTL circuite question

woody · 4th December 2006, 05:13 PM

I spotted a single ended otl that I don`t quite understand.
The circuite uses a 20 ohm resistor,1mh choke and a 600 mh
choke in seriese for the cathode load. Ok the 20 ohm resistor is
to supply the voltage for the grid and most of the signal is developed across the 600mh choke. What is the 1mh choke
there for ? Could it be that a 1mh air core choke is being used
to filter any hi frequency distortion from the 600mh iron core?
choke.

poynton · 4th December 2006, 05:57 PM

Hi.

I recently started a thread about this circuit.

OTL SE - Help Wanted with Idea

I too wondered about the strange arrangement in the cathode.

The circuit apparently works !!! whatever it's for.

Andy

4th December 2006, 05:13 PM	#1
woody diyAudio Member Join Date: Jan 2002 Location: Tyrone Ga. U.S.A.	Old OTL circuite question I spotted a single ended otl that I don`t quite understand. The circuite uses a 20 ohm resistor,1mh choke and a 600 mh choke in seriese for the cathode load. Ok the 20 ohm resistor is to supply the voltage for the grid and most of the signal is developed across the 600mh choke. What is the 1mh choke there for ? Could it be that a 1mh air core choke is being used to filter any hi frequency distortion from the 600mh iron core? choke.

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4th December 2006, 05:57 PM	#2
poynton Magneto the Gravity Man diyAudio Member Join Date: Mar 2005 Location: A life on the ocean waves when I'm not at home in N. Wales (but I'm not Welsh so no sheep jokes!)	Hi. I recently started a thread about this circuit. OTL SE - Help Wanted with Idea I too wondered about the strange arrangement in the cathode. The circuit apparently works !!! whatever it's for. Andy

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