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Old 6th November 2012, 05:05 AM   #11
cotdt is offline cotdt  United States
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Great news! I got rid of the hum/hiss! All I did was attach 470pF capacitors from each 5842 heater pin (3 and 9) to ground.

Now my Tubelab SE 45 is GREAT with headphones. Makes for a noiseless 300B amp too.
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Old 8th November 2012, 06:31 PM   #12
beeah is offline beeah  United States
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Is there a link you can share describing the hows and whys of this approach? Or does anyone else care to chime in?

In any case, glad to hear you got it fixed. I have some bugaboos in my own TSE 45 that I'm trying to sort out.
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Old 8th November 2012, 06:43 PM   #13
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So you added another C to the filter on the input tube's filament power supply.... I guess the question is why this is needed? The circuit is either picking up some extras on the way or your AC power may not be so great. Either way, happy to hear the solution is working for you!
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Old 8th November 2012, 06:48 PM   #14
cotdt is offline cotdt  United States
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All I know is that the 5842's oscillate easily and it is heater related. Others have used the trick for 5842's and it worked for them. I'm not sure why. It doesn't make much sense to me.
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Old 8th November 2012, 06:50 PM   #15
cotdt is offline cotdt  United States
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Quote:
Originally Posted by Davec113 View Post
So you added another C to the filter on the input tube's filament power supply.... I guess the question is why this is needed? The circuit is either picking up some extras on the way or your AC power may not be so great. Either way, happy to hear the solution is working for you!
Maybe the leads are picking up RF noise, I don't know. I have much to learn.
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