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MP566 Tube microphone preamplifier
48v Not Working
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Topic: 48v Not Working
January 19, 2022, 07:43:36 PM
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ellendelen
Newbie
Posts: 14
Karma: +0/-0
48v Not Working
Hi, I have been testing my new preamp which sounds lovely! I have never heard a SM57 sound this fat!
The only thing that doesn't seem to work is the 48v. Any tips on what to check?
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January 20, 2022, 09:46:48 AM
Reply #1
JPK
Administrator
Hero Member
Posts: 1085
Karma: +35/-0
Re: 48v Not Working
The 48V circuit is very straightforward:
It goes from the back connector (lower finger) to switch SW1 to the input XLR through R1, R2, R3.
Check the solder joints on these components.
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JPK
January 20, 2022, 12:33:45 PM
Reply #2
ellendelen
Newbie
Posts: 14
Karma: +0/-0
Re: 48v Not Working
It turns out it is across all of my modules. Weird, I didn't have this before.
Engaging phantom power only puts out about 8 volts DC. So I guess that its something faulty in my RND R6. I will check it with them.
Thanks!
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MP566 Tube microphone preamplifier
48v Not Working
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