Hi Music men
My HD130 head model without the preamp tube stopped working the other night. The first channel as in the one with less tone controls still works but thats not the channel i like to use. Ive had a look at the electrolytics and tested their ESR and they are fine. all four tubes are still glowing. What should i test next? im thinking i may change the lm1458N op amp since the first channel bypasses the preamp section right?
edit* by "not working" i mean no sign of the guitar input sound at all on that channel and the only sound is when you turn the preamp volume to 10 where it just makes noise
Thanks for the help