Thanks for the schematic!
I have an assortment of 12" speakers, some used some NOS. I have a set of 4 of the Carvin 12s that they blew...
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Another JTM60 1x12 thread/question... (haven't seen this one)
I have a JTM60 combo. The guy I bought it from told me it was in pieces , in a box when he bought it. He told me that he corrected the heating problems and...
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Thanks Juan. Actually is is a Mark IV, I found a schematic and posted a link in the previous post, maybe it is the same.
It will be this weekend before...Last edited by jbow; 08-20-2014, 02:55 PM.
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I found a schematic. My best guess is I am looking at U2. It is a TL072. It's a Motorola TL072CP. Am I right that this is the suspected OP amp in the schematic,...Last edited by jbow; 08-19-2014, 11:19 PM.
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Gallien-Kruger 400RB 2x10 combo problem, no signal to speakers.
Hi,
I bought a G-K 400RB from a yard sale. It has a problem that I can't figure out. I'm not much of a tech but I do know a little.
I think I...
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Hey Cthulhu! I will. One of the paper caps... the outer paper turns around the inner paper. I haven't given up on it, I've just had to set it aside again...
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I did some reading last night and from what I read I got that a 60 cycle hum comes from somewhere after the volume pot and to the input, or between the pot...
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This is the grounding idea I am going to use. http://music-electronics-forum.com/t32412/
Thanks to Mort....
J
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5F1/5E1 questions... re: grounding
1: On the schematics there is a .05 μf capacitor from the fuse to ground. I assume that this is no longer needed with a three wire power cord. I took...Last edited by jbow; 03-06-2014, 10:27 PM.
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Thank you for posting this. I have a 5F1 build that has a pretty loud hum with nothing plugged in. Same when I plug a guitar in. I tried a silver face champ...
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I have a Tweed Champ clone with a Weber Sig8-s alnico speaker in it. I also have a ceramic version of the same speaker NIB. I am going to swap the alnico...
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Thanks.. yeah, I understand a layout. I've built several 5f1 clones and one 5e3, they all work well except for a fourth 5f1 that I cannot figure out what...
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I will try to get it done next week.... I have some other things to do and I have never done this before, so I may need some help. I don't know what all...
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OK... I have do a little searching and don't understand where or how to install an isolation transformer. A Google search turns up all kinds of results, it...
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I am not that good... to draw my own schematic, but it would be a good learning project! Drawing a schematic would be a huge learning help to me, I started...
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Thanks Tom.
Both transformers have four wires. I opened it and took some pictures but I think it is an odd design. The chassis is just ne piece of...
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