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dynaco 120


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944guy 
Member - Posts: 40
Member spacespace
Joined: March 14, 2008
Location: Nebraska, United States
Posted: April 13, 2008 at 12:39 AM / IP Logged  
Hey, guys’ im having a problem with my amp it is a home audio amp but it has been great and its 42 years old. I use it in my home as a test amp to make sure people car speaker’s work. The problem is when I hook it up it doesn’t put out any power it puts out just as much if I had my laptop go directly to the sub from the headphone jack. In addition, if I disconnect the speaker wire the amp still plays music with no speakers hook up to it. It plays the full music to not just a certain note the hole thing its pretty quite but I can make out lyrics and what not. If any one has an idea of what is going on let me know because I love this amp and wont to fix it. Sorry long post.dynaco 120 -- posted image.
Heres a pic and there is some info on the amp here. http://home.indy.net/~gregdunn/dynaco/components/ST120/index.html
DYohn 
Moderator - Posts: 10,741
Moderator spaceThis member has made a donation to the12volt.com. Click here for more info.spaceThis member has been recognized as an authority in Electrical Theory. Click here for more info.spaceThis member has been recognized as an authority in Mobile Audio and Video. Click here for more info.spacespace
Joined: April 22, 2003
Location: Arizona, United States
Posted: April 13, 2008 at 10:05 AM / IP Logged  

Both channels are out?  You probably have a bad power supply, although if you loaded this amp with 4-ohm car stereo speakers you could have blown both output transistors.  These amps were designed for 8-ohm or higher loads.  They are fairly easy to work on as they were available as kits and parts are out there.  Lots of Dynaco fans in the world...

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