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Old 20th May 2008, 05:59 AM   #1
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Join Date: Aug 2005
Default no coupling caps

Hi all,

Was wondering if anyone has come up with a way of routing or nulling out the VDC that would be at the output of a Tube preamp's stage, so you do hnot have to use a coupling cap at the outputs?

Ray Bronk
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Old 20th May 2008, 06:46 AM   #2
cerrem is offline cerrem  United States
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Location: San Diego, CA
Typically you use a negative supply on the tail of a CCS acting as the load for a Cathode Follower....
Adjust for 0 volt out.....
The trick to keep the circuit locked in from drifting is closed loop feedback ......Output is DC sampled and sent to error amp to control the CCS grid....

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Old 20th May 2008, 07:10 AM   #3
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Hi Chris,

Well, I am looking at getting a GGP, and was thinking if only I could get rid of the damn coupling caps. It's using 12AU7 tubes. So probably to do what I want is probably not worth the effort. But I thought I'd at least ask.

Ray Bronk
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