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October 06, 2022, 07:24:56 PM

Author Topic: Left channel hum [resolved]  (Read 200 times)

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Offline smodtactical

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Left channel hum [resolved]
« on: July 02, 2022, 07:46:06 PM »
My build is below. The preamp works, sounds fine except for a left channel hum. Reversing tubes doesn't reverse the hum. Reversing output jacks does. Happens on both outputs. Any idea why?

https://cdn.discordapp.com/attachments/594534273483276298/992953107657011231/unknown.png
« Last Edit: July 03, 2022, 06:36:01 AM by Paul Birkeland »

Offline smodtactical

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Re: Left channel hum
« Reply #1 on: July 02, 2022, 08:01:49 PM »
Now it seems to be more of a hiss and when music plays it seems to change character somewhat to the pace of the music.

Online Paul Birkeland

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Re: Left channel hum
« Reply #2 on: July 03, 2022, 05:36:45 AM »
You don't appear to have any connections to pin 3 on either 8 pin socket.  This would cause you to fail your voltage checks for sure, and may cause some damage to the tubes if run for a long time.
Paul "PB" Birkeland

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Offline smodtactical

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Re: Left channel hum
« Reply #3 on: July 03, 2022, 06:28:53 AM »
Oh my god I missed an entire step! You were right Paul. Somehow I still passed resistance and voltage checks. Anyway I added the connectors to terminal 3 as per the instructions. Hum is gone and its now totally silent like my crack!

Thanks Paul you are the best bro.

Edit: Sorry for being a moron :(
« Last Edit: July 03, 2022, 06:30:38 AM by smodtactical »