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PostPosted: Tue Apr 02, 2019 8:03 pm 
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Friend
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Joined: Fri Apr 13, 2018 7:46 am
Posts: 17
Very low, like ear up to my 4x12 to hear it low. I had this issue, couldn’t suss it out so I rebuilt it again from scratch using no similar parts except for jacks and transformers... but still have the same issue.

I made a temporary “preamp out” just before the PI and sent it to a separate power amp and it sounds great, so I don’t believe the problem lies within the preamp section.

Here are the handwritten “actual” voltages I am getting.

I’m out of ideas, can anyone steer me in a direction??

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PostPosted: Wed Apr 03, 2019 11:07 am 
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Experienced
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Joined: Wed Aug 26, 2009 11:27 pm
Posts: 255
Location: Ontario
Check the values of PI cathode resistor make sure its R not K

A picture of the build might help as Well


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PostPosted: Sat Jul 20, 2019 8:06 pm 
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Joined: Sat Jul 20, 2019 7:59 pm
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Hello,

I had a similar problem with a new build...amp worked properly except volume was low. Chopsticking the wiring revealed a bad solder connection on the jumper between pin 8 and 3 on the PI...tapping that wire induced a loud pop out of the speaker. After resoldering that wire, the amp worked perfectly. Hopefully you got the amp working!


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PostPosted: Mon Jul 22, 2019 10:00 am 
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Holy Ghost
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Joined: Sun Mar 13, 2005 4:10 pm
Posts: 7379
Location: Brighton, Canada
What is the cathode voltage on the 6V6's . Is it 22 or close per spec??

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