Forums
New posts
Search forums
What's new
New posts
Latest activity
Members
Registered members
Current visitors
Log in
Register
What's new
Search
Search
Search titles only
By:
New posts
Search forums
Menu
Log in
Register
Install the app
Install
Commercial Members
Commercial Members - News & Discussion
6N1 preamplifier with phono
JavaScript is disabled. For a better experience, please enable JavaScript in your browser before proceeding.
You are using an out of date browser. It may not display this or other websites correctly.
You should upgrade or use an
alternative browser
.
Reply to thread
Help Support AVForums:
This site may earn a commission from merchant affiliate links, including eBay, Amazon, and others.
Message
<blockquote data-quote="Mars" data-source="post: 710141" data-attributes="member: 817"><p>Thanks handsome; it's all coming back to me now :teach: I used the same tweak to set up the dc coupled phase splitters :facepalm:</p><p></p><p>OK, so I did that. I pulled out my decade resistance tool, and tried to set up the 10k resistors for equal current flow (same DC voltage drop across the 10k resistors). Not even 0 ohms could balance the CCDA. Next I moved to 33k resistors. I could bias the CCDA nicely with a 470 ohm resistor, but the current flow was about 4mA through the triodes. I would like to get closer to the 10mA handsome suggested. So next is 22k. I had some 5watt resistors and it all balanced nicely with a 100 ohm cathode resistor on the first triode. The voltage across the 100 ohm is 1.2V, and the voltage drop across the 22k's is about 145V on average. That is about 7mA per triode. Closer to the 10mA target number. I could try something lower, but I do not want to bias the input triode any lower than 1.2V, so I'm running with the setup a bit, to check if the sound is good. </p><p></p><p>I left the preamp with emtturntable to check out the phono stage. There should be some comment by Monday, I hope.</p></blockquote><p></p>
[QUOTE="Mars, post: 710141, member: 817"] Thanks handsome; it's all coming back to me now :teach: I used the same tweak to set up the dc coupled phase splitters :facepalm: OK, so I did that. I pulled out my decade resistance tool, and tried to set up the 10k resistors for equal current flow (same DC voltage drop across the 10k resistors). Not even 0 ohms could balance the CCDA. Next I moved to 33k resistors. I could bias the CCDA nicely with a 470 ohm resistor, but the current flow was about 4mA through the triodes. I would like to get closer to the 10mA handsome suggested. So next is 22k. I had some 5watt resistors and it all balanced nicely with a 100 ohm cathode resistor on the first triode. The voltage across the 100 ohm is 1.2V, and the voltage drop across the 22k's is about 145V on average. That is about 7mA per triode. Closer to the 10mA target number. I could try something lower, but I do not want to bias the input triode any lower than 1.2V, so I'm running with the setup a bit, to check if the sound is good. I left the preamp with emtturntable to check out the phono stage. There should be some comment by Monday, I hope. [/QUOTE]
Insert quotes…
Verification
Post reply
Commercial Members
Commercial Members - News & Discussion
6N1 preamplifier with phono
Top