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In Reply to: Futterman OTL3 - R29 gets very hot posted by therkild on February 27, 2020 at 13:29:51:
Hi Roger
I found the fault, poor soldering in a connection at one of the tubes.
What I'm struggling with right now is the voltage level across test point one and pin 11 (grid 2) on either V6, V7 & V8. According to the instruction I have there should be around 170 volt, adjusted by R16. I only get half ot it i.e 85 VDC, so think I need to look into the rectifying circuit.
Step learning curve but that's okay, I enjoy learning day by day.
Diagram attached, I have a corresponding version from whomever built it back in the 80'ties.
Regards
Thomas
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Follow Ups
- RE: Futterman OTL3 - R29 gets very hot - therkild 11:35:25 02/28/20 (5)
- RE: Futterman OTL3 - R29 gets very hot - airheadair 22:42:31 04/13/20 (2)
- RE: Futterman OTL3 - R29 gets very hot - therkild 03:25:01 04/15/20 (1)
- RE: Futterman OTL3 - R29 gets very hot - rhinohifi714 14:02:04 04/29/20 (0)
- I'd be looking at the screen regulator for that circuit. - Ralph 14:21:25 03/03/20 (0)
- RE: Futterman OTL3 - R29 gets very hot - rogerh113 07:48:18 03/02/20 (0)
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