tlsmith Posted February 18, 2010 Share Posted February 18, 2010 I have an old Gibson GA15RVT that needs repair. I have replaced all of the tubes (all 5 of them) and still get no sound at all, not even a hum. All of the tubes light up bright and the little red light on the front of the amp lights up. What has gone wrong? Link to comment Share on other sites More sharing options...
Gibson Gear01 Posted February 18, 2010 Share Posted February 18, 2010 It could be a number of problems, but I would advise checking the speaker connections first , and also make sure the speaker is not dead. You can test the speaker with a 9 volt battery as shown in this link. http://www.soundspeakerrepair.com/speaker-parts-cp/Speaker-Testing-with-9-Battery/INST/Installation+Instructions/ If you find that your speaker is working properly and the speaker cables are good, and you still do not get any output at all, then I would suggest you bring the amp to a qualified tech to check the output transformer. Good Luck Link to comment Share on other sites More sharing options...
tlsmith Posted February 18, 2010 Author Share Posted February 18, 2010 Thanks: I'll give that a try first and see what happens. Link to comment Share on other sites More sharing options...
tlsmith Posted February 23, 2010 Author Share Posted February 23, 2010 I switched out the dead speaker and now I get a loud hum without any sound from the instrument. At least the speaker works now. Where do I go from here? Link to comment Share on other sites More sharing options...
L5Larry Posted February 23, 2010 Share Posted February 23, 2010 I switched out the dead speaker and now I get a loud hum without any sound from the instrument. At least the speaker works now. Where do I go from here? To a repair shop! Link to comment Share on other sites More sharing options...
max2343 Posted February 28, 2010 Share Posted February 28, 2010 You might just have a bad fuse. It could be the boards output 1/2 amp fuse. Try replacing it. After you get that replaced and if it works fire it up and watch the tubes to see if 1 or more of them are red platting because thats one reason it may blow the output board fuse. If its red platting you have to get it baised by a pro Link to comment Share on other sites More sharing options...
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