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Old 6th May 2012, 05:42 AM   #11
rknize is offline rknize  United States
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Sound like the regulator is dropping out. I found that D5 and D6 are a bit overtaxed in this design when used for 300B duty. Swapping them for a pair of Schottky diodes props up the heater supply a bit and they run much cooler to boot.
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Old 6th May 2012, 03:19 PM   #12
Green77 is offline Green77  Sweden
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Hello.

D5 & D6? I don't have them in my schematic.. Is it the STPS30L30?

Thanks
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Old 6th May 2012, 05:15 PM   #13
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He meant D4 and D5. (Tubelab page)
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Old 6th May 2012, 05:17 PM   #14
rknize is offline rknize  United States
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Sorry, D4 and D5. The 1N5401s. When used with 45s, these just provide the bottom half of the bridge rectifier for the input tube filaments. When used with 300Bs, they become part of the bridge for the output tubes too. Mine run very hot...hot enough to discolor the PCB.
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Old 6th May 2012, 06:40 PM   #15
Green77 is offline Green77  Sweden
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Aha, thanks! I can try later this week to change them to 1N5821..I have them home. Will this raise the 6,3 V heater on input tubes?

//Daniel
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Old 7th May 2012, 05:59 PM   #16
rknize is offline rknize  United States
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It may raise it a tenth or two. You can check it afterwards and then adjust R3 accordingly.
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Old 7th May 2012, 06:06 PM   #17
Green77 is offline Green77  Sweden
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Ok, thanks. I will check it. Hope this stop the hum
//Daniel
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Old 28th September 2012, 07:50 PM   #18
cotdt is offline cotdt  United States
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Quote:
Originally Posted by rknize View Post
Sound like the regulator is dropping out. I found that D5 and D6 are a bit overtaxed in this design when used for 300B duty. Swapping them for a pair of Schottky diodes props up the heater supply a bit and they run much cooler to boot.
What Schottky diodes are good to replace D4 and D5? I want to convert my TSE to a 300B eventually.
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