The smell of resistors in the evening - diyAudio
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Old 29th May 2014, 12:32 AM   #1
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Default The smell of resistors in the evening

R16 to be precise.

Was measuring the two caps C11 and C9 and C11 I could get close to 175V but the other would shoot up to over 350V (brought up via Variac).

I swapped the 5842's around and it stayed with the channel so it seems not to be the tubes.

R16 then smoked so I shut down.

Any advice? What could cause 350V at C9?

I should add that B+ and B- are within expected range.
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Last edited by moggi1964; 29th May 2014 at 09:58 PM. Reason: Additional info
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Old 14th June 2014, 08:05 PM   #2
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Anyone?
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Old 14th June 2014, 09:06 PM   #3
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Well it's unknown what it is you are talking about, so it's a bit hard to say something sensible.
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Old 14th June 2014, 09:09 PM   #4
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Sounds like a bad 10M45 - drawing excessive current.
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Old 14th June 2014, 09:21 PM   #5
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Resistors too small wattage?
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Old 14th June 2014, 09:37 PM   #6
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Give us a clue. A schematic would be good.
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Old 14th June 2014, 09:45 PM   #7
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Sorry, I thought I had mentioned it was the TSE I was building.

JP; thanks, I have ordered a replacement as I thought that might be a culprit.

Jon, checked the resistors match the Part List.

Being doing some measurements comparing resistance across resistors and they seem to match on both sides (R16 slightly off now that it smoked).

I'll start by replacing the 10M45 and see how that pans out.
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Old 14th June 2014, 10:39 PM   #8
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Does that channel red plate the 5842?
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Old 15th June 2014, 03:16 PM   #9
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Yes it does JP!

You are on to something here I can feel it
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Old 15th June 2014, 04:46 PM   #10
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Yep, the 10M45 is a goner. Unfortunately, that 5842 may be as well. I'd replace R16 as well - I never trust them after they've been overheated.
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