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
DIY & Tutorials
DIY For Audio
6L6 UL PP valveamp build thread
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="fredeb" data-source="post: 1025443" data-attributes="member: 13623"><p>Hey Eric , yes , power transformer seems to be coping better than I anticipated . Having adjusted bias to ~75% total dissipation per tube voltage dropped to 410V on B+ . B++ is 365V . After having replaced 4k7 with 47k at B+++ voltage there is 235V .</p><p></p><p>Transformer appears to be running quite cool ( just slightly warm to the touch , not hot ) .</p><p></p><p>It was a bit late when I spoke to you last night , but these transformers , which I imported from the USA , have a primary rated at 240V @ 50hz .</p><p></p><p>Seem to be really decent transformers </p><p>, EI96 with ~80mm stack . Beefy .</p><p></p><p>Without load filament winding is rated 6.3V at 6.5A ; I thought it would drop to at least 6.3V , but is hovering around 6.4-6.5V . I usually prefer filament voltage a little lower rather , in favour of tube life , so this bugs me a little . I was actually thinking about putting a 0.33 or 0.47e resistor in series to see if I can drop it ever so slightly .</p><p></p><p></p><p></p><p>Sent from my SM-G935F using Tapatalk</p></blockquote><p></p>
[QUOTE="fredeb, post: 1025443, member: 13623"] Hey Eric , yes , power transformer seems to be coping better than I anticipated . Having adjusted bias to ~75% total dissipation per tube voltage dropped to 410V on B+ . B++ is 365V . After having replaced 4k7 with 47k at B+++ voltage there is 235V . Transformer appears to be running quite cool ( just slightly warm to the touch , not hot ) . It was a bit late when I spoke to you last night , but these transformers , which I imported from the USA , have a primary rated at 240V @ 50hz . Seem to be really decent transformers , EI96 with ~80mm stack . Beefy . Without load filament winding is rated 6.3V at 6.5A ; I thought it would drop to at least 6.3V , but is hovering around 6.4-6.5V . I usually prefer filament voltage a little lower rather , in favour of tube life , so this bugs me a little . I was actually thinking about putting a 0.33 or 0.47e resistor in series to see if I can drop it ever so slightly . Sent from my SM-G935F using Tapatalk [/QUOTE]
Insert quotes…
Verification
Post reply
DIY & Tutorials
DIY For Audio
6L6 UL PP valveamp build thread
Top