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Old 24th March 2014, 01:01 AM   #1
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Default SSE hissing problem.

Hi all,

I'm hoping you can help. My SSE hisses in use. Its intermittent but frequent and isn't exclusive to one channel. I it sound like radio noiee between stations or between tracks on a record.i've swapped all the tubes to no avail, used different sources, cables but again, no change.

Going up and down in volume appears to instigate it. It can even occur quite reliably at certain points in the volumes position so I changed the volume pot but again, no change.

Help!
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Old 24th March 2014, 04:05 AM   #2
rmyauck is offline rmyauck  Canada
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Resistors can cause hissing. Maybe re-flow all solder connections and check every other connection for tightness.
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Old 26th March 2014, 11:39 PM   #3
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Hi, thanks for the suggestions.

I've just visually inspected all the Pcb components for obvious defects but found none. I've tightened all the tube sockets to give a better connection but that also made no difference.

I'll fire up the soldering irion tomorrow to reflow the solder joints but, failing that how does one identify a faulty resistor or is it best to simply replace all of them?
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Old 29th March 2014, 11:17 PM   #4
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I reflowed all the resistor joints and replaced C12, C22, C12 & C22 after reading about someone else's similar problem but to no avail.

Hissssssssss...
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Old 31st March 2014, 02:34 AM   #5
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What's your grounding scheme look like?
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Old 31st March 2014, 10:42 AM   #6
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The same as this one.

Click the image to open in full size.

I've star grounded everything to one point then grounded that to the iec socket.
Its not a humming noise though, its the crackly hissing noise between tracks on a record. Very odd.
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Old 31st March 2014, 05:29 PM   #7
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Hissing that changes can be a faulty tube/driver tube most likely. Try a few more 12AT7 - preferable old stock. Check your wires going from the input jack to the volume pot and solder joints on the volume pot. I twist my signal wires if not using shielded cable and be SURE the signal wires are as far away from your AC jack and AC wires going to the power transformer. Basically isolate those signal wires as best you can. Post a pic of underside maybe there's something glaring at you and another set of eyes can sometimes be a good thing.

Notice how on George's diagram all the signal wires are off to one side of the chassis away from most all the other wires. There's a reason for that not just to make the diagram easy to follow.

Cheers,
Bob
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Old 31st March 2014, 06:21 PM   #8
BZed is offline BZed  United States
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I would check that the correct resistor values were installed around the input circuit and that any feedback has the correct component values and phase connection to the output transformer. Your description seems like it may be oscillating.
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Old 31st March 2014, 07:31 PM   #9
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I've tried multiple tubes which has made no difference.

I've kept the speaker terminals and input terminals away from the power supply wiring and is actually compartmentalised.

The input wiring is shielded, grounded and twisted.

The speaker wiring for the left channel is very short and goes no where near any power cables (it is only the left side that is hissing on and off, the right is fine and clean).

All components have been checked and, are the same part numbers specified by George and obtained from Mouser.

This noise hasn't been there from the start. I've had 6 months of clean sound and the on/off hissing has only been present since late last year. I've only just got around to doing something about it.
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Old 31st March 2014, 09:47 PM   #10
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Obvious question but have you tried switching the speakers over to make sure the fault does not lie within the particular speaker? I expect so but rule out hte obvious....right!
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