Re: For Kurt or ? input tube bias?

Posted by SteveBrown on March 29, 2001 at 11:13:43

In Reply to: Re: For Kurt or ? input tube bias? posted by Paul Joppa on March 28, 2001 at 23:13:47:

Thanks for the input, Paul. I'll try your suggestions. I do have a couple of plate chokes from MQ -- 100H, 10ma. Sounds like just the ticket for this application. As a relative novice to tube design, I wonder if I could get input from someone on how to do this. Here's my idea (let me know if it's wrong): My supply voltage is 460v. If I use a choke, I suspect the DC voltage at either end of it is going to be about the same. So to put 250v on the 6N1P, I'll have to drop (460-250) 210v. 210v at 5ma would mean a dropping resistor of 42k, and 5watts (including a safety margin of 5x). To get 5ma to flow, I'll use a 1k grid resistor on the 6N1P, putting the grid at -5v. Does that all sound correct? By the way, the chokes have a black dot by one terminal. Should I assume that's the B+ side, or does it make a difference?
Steve Brown

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Follow Ups Full Thread

Topic - For Kurt or ? input tube bias? - SteveBrown 11:30:17 03/27/01 (14)

Re: For Kurt or ? input tube bias? - SteveBrown 18:19:34 03/27/01 (10)

Re: For Kurt or ? input tube bias? - Sacreficialanode 08:12:53 03/28/01 (0)

Re: For Kurt or ? input tube bias? - Kurt Strain 19:12:12 03/27/01 (8)

Re: For Kurt or ? input tube bias? - stevebrown 19:18:43 03/27/01 (7)

Re: For Kurt or ? input tube bias? - Paul Joppa 23:13:47 03/28/01 (3)

Re: For Kurt or ? input tube bias? - SteveBrown 03/29/0111:13:43 03/29/01 (2)

Re: For Kurt or ? input tube bias? - Roscoe Primrose 13:46:24 03/29/01 (1)

Re: For Kurt or ? input tube bias? - SteveBrown 15:17:50 03/29/01 (0)

Re: For Kurt or ? input tube bias? - Kurt Strain 21:30:18 03/27/01 (1)

Re: For Kurt or ? input tube bias? - Kurt Strain 21:32:09 03/27/01 (0)

With two stages (nt) - Roscoe Primrose 20:56:35 03/27/01 (0)

Re: For Kurt or ? input tube bias? - Kurt Strain 14:16:01 03/27/01 (2)

Re: For Kurt or ? input tube bias? - dave slagle 16:33:30 03/27/01 (1)

That's true. Good point. nt - Kurt Strain 19:14:53 03/27/01 (0)

Follow Ups

Re: For Kurt or ? input tube bias? - SteveBrown 03/29/0111:13:43 03/29/01 (2)

Re: For Kurt or ? input tube bias? - Roscoe Primrose 13:46:24 03/29/01 (1)

Re: For Kurt or ? input tube bias? - SteveBrown 15:17:50 03/29/01 (0)

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