RE: Cool

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RE: Cool

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Posted by dave slagle on March 20, 2012 at 18:24:07

In Reply to: RE: Cool posted by Dave Davenport on March 20, 2012 at 18:13:49:

I have used a simple LM350 as a CCS on a tertiary winding of an output for a GM70. The goal was to run 2A of current through a low turn winding to offset 100ma of primary current.

In testing I found out the hard way that there was about 700V at 60Khz appearing across the primary with the CCS operating. This was without the Rp of the tube or a speaker load both of which damped out the oscillation. The OT also had an amorphous core which may have played a role.

In any event the basic idea of not putting two current sources in series is the basis for my warning so they will both fight to be in control which can lead to oscillation.

dave

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Follow Ups Full Thread

Topic - Series feed SE OPT with no air gap and low flux?? - Tube747 23:12:48 03/16/12 (18)

RE: Series feed SE OPT with no air gap and low flux?? - danlaudionut 23:37:58 03/16/12 (17)

RE: Series feed SE OPT with no air gap and low flux?? - Tre' 08:51:22 03/17/12 (16)

RE: Series feed SE OPT with no air gap and low flux?? - danlaudionut 09:10:54 03/17/12 (15)

Cool - Tre' 13:38:27 03/17/12 (14)

Why not a parafeed instead of gone thru so much trouble? (NT) - pushpulltriode 02:04:40 03/21/12 (0)

RE: Cool - dave slagle 07:32:19 03/18/12 (11)

RE: Cool - Tre' 08:28:57 03/18/12 (10)

RE: Cool - dave slagle 08:46:15 03/18/12 (9)

RE: Cool - Dave Davenport 18:13:49 03/20/12 (3)

RE: Cool - dave slagle 18:24:07 03/20/12 (2)

RE: Cool - Dave Davenport 21:16:15 03/21/12 (1)

RE: Cool - dave slagle 15:40:04 03/22/12 (0)

RE: Cool - dave slagle 19:36:27 03/18/12 (4)

RE: Cool - Tre' 11:32:04 03/19/12 (3)

RE: Cool - dave slagle 12:12:00 03/19/12 (2)

RE: Cool - Tre' 14:30:32 03/19/12 (1)

RE: Cool - dave slagle 15:51:56 03/19/12 (0)

RE: Cool - danlaudionut 17:18:43 03/17/12 (0)

Follow Ups

RE: Cool - dave slagle 18:24:07 03/20/12 (2)

RE: Cool - Dave Davenport 21:16:15 03/21/12 (1)

RE: Cool - dave slagle 15:40:04 03/22/12 (0)

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