Welcome to Solid State Guitar Amp Forum | DIY Guitar Amplifiers. Please login or sign up.

June 21, 2024, 10:57:58 AM

Login with username, password and session length

Recent Posts


Roland CUBE 100

Started by tette2, March 14, 2017, 11:21:36 AM

Previous topic - Next topic


Hallo !   This is my first post here .   I have changed all  electr. caps in this guitarcombo .  The amp works fine with a very nice sound if I start it

without a speaker connected .  And then connect the speaker .   But if I have the speaker connected , like it should be normally ,  the amp

tilts and the protection lamp I have in series from the walloutlet  ( 230 VAC )  glows ....  current flows ..... probably through one of the powertransistors while the other is choked..... ?    Thanks for some advice ...   tette


Your protection lamp is causing the problem.
If you do not measure DC voltage on the output with speaker disconnected, then you do not need the protection lamp.