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
Gunter Steinhart amps: Help Required
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: 37556" data-attributes="member: 82"><p>The vibration comes from the transformer laminations. This seems to indicate that the transformer might be working hard, either as a result of a shorted rectifier diode in the power supply, or quite likely the output valves are incorrectly biased and are therefore causing the valves to go into heavy forward conduction. This in turn, could be caused by an incorrect bias pot setting, or a leaky G1 capacitor on one or both of the output valves. The cause of this vibration must be determined and the amplifier should not be powered up until the problem is remedied.</p><p></p><p>There is nothing 'magic' about Gunther's amplifiers, but due care and diligence should be made when working on them. In the one I have, no form of HT discharging was provided for other than the HT discharging slowly (*very* slowly...) as the amplifier switched off. I found this out the hard way... all 500V of it! ;D I fitted some bleeding resistors over the HT reservoir caps to sort out that problem. </p><p></p><p>My amplifier is not the one you have, but their circuits are all pretty similar.</p><p></p><p></p><p>-F_D</p></blockquote><p></p>
[QUOTE="Family_Dog, post: 37556, member: 82"] The vibration comes from the transformer laminations. This seems to indicate that the transformer might be working hard, either as a result of a shorted rectifier diode in the power supply, or quite likely the output valves are incorrectly biased and are therefore causing the valves to go into heavy forward conduction. This in turn, could be caused by an incorrect bias pot setting, or a leaky G1 capacitor on one or both of the output valves. The cause of this vibration must be determined and the amplifier should not be powered up until the problem is remedied. There is nothing 'magic' about Gunther's amplifiers, but due care and diligence should be made when working on them. In the one I have, no form of HT discharging was provided for other than the HT discharging slowly (*very* slowly...) as the amplifier switched off. I found this out the hard way... all 500V of it! ;D I fitted some bleeding resistors over the HT reservoir caps to sort out that problem. My amplifier is not the one you have, but their circuits are all pretty similar. -F_D [/QUOTE]
Insert quotes…
Verification
Post reply
Audio and Video Talk
General Discussion
Gunter Steinhart amps: Help Required
Top