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
Sansui 1000A Transformers on chassis
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="Ampdog" data-source="post: 761614" data-attributes="member: 144"><p><span style="font-size: 16px"><em>YIKES!!</em></span></p><p></p><p>If you are certain that the primary winding is for the highest voltage, I fear a primary series resistor is indicated; 6,9V heater supply will shorten valve life. Yes, this is with no load, so better to determine later when all voltages are loaded, but I would guess that it would still be unacceptably high. (I begin to frown when 6,3V heater voltages go over 6,6V.) A series primary resistor is undesirable but unfortunately often the only way out. A better way but cumbersome and unsightly, is to use a small bucking power transformer, bucking say 10V in the primary circuit (small; only a few VA required, but less wasteful heat generated).</p></blockquote><p></p>
[QUOTE="Ampdog, post: 761614, member: 144"] [SIZE=16px][i]YIKES!![/i][/SIZE] If you are certain that the primary winding is for the highest voltage, I fear a primary series resistor is indicated; 6,9V heater supply will shorten valve life. Yes, this is with no load, so better to determine later when all voltages are loaded, but I would guess that it would still be unacceptably high. (I begin to frown when 6,3V heater voltages go over 6,6V.) A series primary resistor is undesirable but unfortunately often the only way out. A better way but cumbersome and unsightly, is to use a small bucking power transformer, bucking say 10V in the primary circuit (small; only a few VA required, but less wasteful heat generated). [/QUOTE]
Insert quotes…
Verification
Post reply
Audio and Video Talk
Valves / Vacuum Tubes
Sansui 1000A Transformers on chassis
Top