no coupling caps

ray bronk · 20th May 2008, 05:59 AM

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

cerrem · 20th May 2008, 06:46 AM

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....

Chris

ray bronk · 20th May 2008, 07:10 AM

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

20th May 2008, 05:59 AM	#1
ray bronk diyAudio Member Join Date: Aug 2005	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

Thread Tools	Search this Thread
Show Printable Version Email this Page	Search this Thread: Advanced Search

Similar Threads
Thread	Thread Starter	Forum	Replies	Last Post
Coupling caps.	Trebla	Class D	5	1st March 2006 09:12 PM
Pre-amp coupling caps	Bill Fitzpatrick	Parts	15	4th March 2005 11:54 AM
coupling caps	el capitan83	Tubes / Valves	10	17th December 2004 04:25 PM
coupling caps???	AudioGeek	Tubes / Valves	14	16th September 2004 12:05 PM
What value for the coupling caps?	roibm	Parts	12	23rd March 2004 05:58 PM

New To Site?	Need Help?
Register to Participate Search Privacy Statement Contact Us	Frequently Asked Questions Did you forget your password? Mark Forums Read


	Please consider donating to help us continue to serve you. Ads on/off / Custom Title / More PMs / More album space / Advanced printing & mass image saving

20th May 2008, 06:46 AM	#2
cerrem diyAudio Member Join Date: Jun 2005 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.... Chris

20th May 2008, 07:10 AM	#3
ray bronk diyAudio Member Join Date: Aug 2005	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