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
Audio and Video Talk
Valves / Vacuum Tubes
How to design a Power Transformer for a Push-pull tube amplifier?
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="handsome" data-source="post: 195165" data-attributes="member: 772"><p>the ultimate 'upgrade' is purported to be replacing the dropper resistors with constant current sources. considering that you are using chokes of course their isolation could nullify any of these improvements. interesting that you say the RC filter was the most effective. i run my VRs (2x VR150) at approximately twice the preamp draw roughly 20mA but they are fed from 400V so no drop out issues whatsoever. i used 10W resistors as the heat is enormous. </p><p></p><p>by the way the current through the voltage amp and cathode follower will always be in anti-phase and thus cancel (if both currents are equal of course). the voltage amp inverts phase the CF doesn't. </p><p></p><p>i must say i never had any issues with my CFs but i did put 10k grid stoppers on them - mounted right on the pins and 470R cathode stoppers again right on the pins. i used carbon composition resistors for those because they have absolutely no inductance whatsoever. CFs can be nervous but the stoppers are usually a cure.</p></blockquote><p></p>
[QUOTE="handsome, post: 195165, member: 772"] the ultimate 'upgrade' is purported to be replacing the dropper resistors with constant current sources. considering that you are using chokes of course their isolation could nullify any of these improvements. interesting that you say the RC filter was the most effective. i run my VRs (2x VR150) at approximately twice the preamp draw roughly 20mA but they are fed from 400V so no drop out issues whatsoever. i used 10W resistors as the heat is enormous. by the way the current through the voltage amp and cathode follower will always be in anti-phase and thus cancel (if both currents are equal of course). the voltage amp inverts phase the CF doesn't. i must say i never had any issues with my CFs but i did put 10k grid stoppers on them - mounted right on the pins and 470R cathode stoppers again right on the pins. i used carbon composition resistors for those because they have absolutely no inductance whatsoever. CFs can be nervous but the stoppers are usually a cure. [/QUOTE]
Insert quotes…
Verification
Post reply
Audio and Video Talk
Valves / Vacuum Tubes
How to design a Power Transformer for a Push-pull tube amplifier?
Top