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50Hz hum from S.E.X. amp, only headphones and left channel.
50Hz hum from S.E.X. amp, only headphones and left channel.
mwgrient
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mwgrient
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Re: 50Hz hum from S.E.X. amp, only headphones and left channel.
Reply #15 on:
June 21, 2020, 06:57:13 AM
Hey Paul, the hum is still there, even without any connection. No speakers, no rca input. I will test with a phone. Thanks!
mwgrient
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Re: 50Hz hum from S.E.X. amp, only headphones and left channel.
Reply #16 on:
June 21, 2020, 08:13:15 AM
there is stil hum, with or without rca / phone connection and if played music, I do not hear it until the volume is al the way down, then I hear the hum/noise again.
Paul Birkeland
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Re: 50Hz hum from S.E.X. amp, only headphones and left channel.
Reply #17 on:
June 21, 2020, 09:31:46 AM
So there's a sweet spot where there is little to no noise when the volume control is around the middle of its rotation?
What kind of solder did you use when building your kit? Did you use any flux or other products along with the solder?
Paul "PB" Birkeland
Bottlehead Grunt & The Repro Man
mwgrient
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Re: 50Hz hum from S.E.X. amp, only headphones and left channel.
Reply #18 on:
June 21, 2020, 10:52:03 PM
I have bought it build, but have done so much since then that I consider it build myself :-)
See attached label for solder I used. I see a lot of brown spots on the solder. So It has probably flux or something else in the core of the solder. I use flux myself too on some points (flux Almit, T435).
mwgrient
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Re: 50Hz hum from S.E.X. amp, only headphones and left channel.
Reply #19 on:
June 21, 2020, 11:23:31 PM
I also use a soldering station with temp at 710/750 F. And see that the solder is expired??
Paul Birkeland
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Re: 50Hz hum from S.E.X. amp, only headphones and left channel.
Reply #20 on:
June 22, 2020, 05:03:52 AM
For some reason I can't open or view the photo, is there a product name/number with the solder?
Paul "PB" Birkeland
Bottlehead Grunt & The Repro Man
Doc B.
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Re: 50Hz hum from S.E.X. amp, only headphones and left channel.
Reply #21 on:
June 22, 2020, 05:15:57 AM
Photoshop says the jpeg file has an "unknown or invalid marker type". You might try saving as a .png file and reposting it.
Dan "Doc B." Schmalle
President For Life
Bottlehead Corp.
mwgrient
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Re: 50Hz hum from S.E.X. amp, only headphones and left channel.
Reply #22 on:
June 22, 2020, 05:55:14 AM
Hope you can see it now. Picture of solder and flux.
Paul Birkeland
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Re: 50Hz hum from S.E.X. amp, only headphones and left channel.
Reply #23 on:
June 22, 2020, 05:59:12 AM
OK, yeah, the brown dots are probably that flux you've added. You might find it a lot easier to use a 60/40 leaded solder with rosin core flux in the solder, then you don't need the separate bottle of flux.
Paul "PB" Birkeland
Bottlehead Grunt & The Repro Man
mwgrient
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Posts:
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Re: 50Hz hum from S.E.X. amp, only headphones and left channel.
Reply #24 on:
June 22, 2020, 07:16:48 AM
thanks, I have ordered just that.
grufti
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Re: 50Hz hum from S.E.X. amp, only headphones and left channel.
Reply #25 on:
June 22, 2020, 09:13:01 AM
The Fluitin 1532 solder is a rosin core solder. "DESCRIPTION - Alpha Fluitin 1532 is an activated rosin cored solder wire developed for general hand soldering applications. Fluitin 1532 is suitable for use in any commercial no-clean hand soldering application that specifies compliance to J-STD-004 – ROM1 standard." It's pretty standard useful stuff. There was never a need to use flux from a bottle.
mwgrient
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Re: 50Hz hum from S.E.X. amp, only headphones and left channel.
Reply #26 on:
June 22, 2020, 12:28:44 PM
Yes, I can see that on the soldering joints. mostly with a lot of brown color. But the solder label says it's overdue...
Paul Birkeland
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19694
Re: 50Hz hum from S.E.X. amp, only headphones and left channel.
Reply #27 on:
June 22, 2020, 12:38:14 PM
Eh, solder doesn't really expire. I've used solder that's older than I am.
Paul "PB" Birkeland
Bottlehead Grunt & The Repro Man
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