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
General Discussion
Seeking schematic for Rotel RB-890 power 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="Family_Dog" data-source="post: 94345" data-attributes="member: 82"><p>This is what I am suspecting. The bias voltages were correct and there was no overheating. Volume was turned down low, less than 30%. The amp uses two bipolar transistors in a complimentary design. I had not (yet) replaced the smaller signal trannies (mainly because I was unable to source all of them at the time) but this will be done in a future attempted repair. I had no trace of parasitic oscillations so it made me even more certain of inferior components, in spite of Toshiba branding on the cases.</p><p></p><p>Because I was unsure of the quality of the replacement transistors, I have not bought NEC equivalents, which are at least genuine NEC. </p><p></p><p></p><p>-F_D</p></blockquote><p></p>
[QUOTE="Family_Dog, post: 94345, member: 82"] This is what I am suspecting. The bias voltages were correct and there was no overheating. Volume was turned down low, less than 30%. The amp uses two bipolar transistors in a complimentary design. I had not (yet) replaced the smaller signal trannies (mainly because I was unable to source all of them at the time) but this will be done in a future attempted repair. I had no trace of parasitic oscillations so it made me even more certain of inferior components, in spite of Toshiba branding on the cases. Because I was unsure of the quality of the replacement transistors, I have not bought NEC equivalents, which are at least genuine NEC. -F_D [/QUOTE]
Insert quotes…
Verification
Post reply
Audio and Video Talk
General Discussion
Seeking schematic for Rotel RB-890 power amplifier
Top