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February 25, 2020, 05:45:38 PM

Author Topic: Feedback through headphones, looking for advice  (Read 128 times)

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Offline pierrot

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Feedback through headphones, looking for advice
« on: February 14, 2020, 10:37:42 PM »
Hi All,

I'm having a bit of difficulty troubleshooting my crack build and i'm looking for advice on how to fix my issue.

I'm mainly getting the rubbing sound feedback every now and then and I haven't been able to fix it. I think it started when I installed the speed ball 1.1 OTL upgrade.

using leadless solder and a soldering iron that goes to 480 degrees C.

So far I've been going through the joints and reheated all of the ones that looked a bit dodgy. Probably missed some though!

thanks!

edit: the last board had one of the wires fall off when I was moving it to take a picture, going to resolder it on later.
« Last Edit: February 14, 2020, 10:39:16 PM by pierrot »

Online Paul Birkeland

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Re: Feedback through headphones, looking for advice
« Reply #1 on: February 16, 2020, 04:46:01 PM »
I would get some 60/40 solder with lead and touch up every single joint in the amp.

This is what I do for factory repairs that come in with lead free solder.
Paul "PB" Birkeland

Bottlehead Grunt & The Repro Man

Offline pierrot

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Re: Feedback through headphones, looking for advice
« Reply #2 on: February 16, 2020, 06:37:09 PM »
Thanks, I'll do that and report back.

Offline pierrot

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Re: Feedback through headphones, looking for advice
« Reply #3 on: February 23, 2020, 11:05:58 PM »
Alrighty,

I've basically added a dab or redid the solder joints that had too much solder after a dab with 60/40 lead solder.

Unfortunately I still have an intermittent crackle/squeel in both sides

All the LEDs light up and both the tubes light up.


Please advise

Thanks!
« Last Edit: February 23, 2020, 11:21:54 PM by pierrot »

Online Paul Birkeland

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Re: Feedback through headphones, looking for advice
« Reply #4 on: Yesterday at 05:01:32 AM »
Can you repost some new photos? Did you use any separate flux during any portion of this soldering?
Paul "PB" Birkeland

Bottlehead Grunt & The Repro Man