Solid State Guitar Amp Forum | DIY Guitar Amplifiers

Solid State Amplifiers => Amplifier Discussion => Topic started by: tette2 on March 14, 2017, 11:21:36 AM

Title: Roland CUBE 100
Post by: tette2 on March 14, 2017, 11:21:36 AM
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
Title: Re: Roland CUBE 100
Post by: g1 on March 14, 2017, 12:48:57 PM
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.