Tube Amp Archive

I’m reading all of these responses with great interest, but it seems like nearly everyone is commenting on best practice for fuse and switch placement. Although it’s interesting reading, respectfully, this is not what I was asking about. :? The fuse is almost always on the Line side in these schemat...

i don't know if you see what gear with the sunn badge on it is fetching these days It’s true, I’m not as familiar with Sunn amps. But I’ve seen beautiful 1960s Twin Reverbs selling for well under a $1000. They must be one of the best values you can get in vintage amps. It would difficult to get the...

I was going to just build a Fender Twin amp… I’m new to building tube amps myself. I’ve been building pedals and audio electronics for more than a decade, but my interest only turned to tube guitar amps in the past couple years. This is just to say I’m not an experienced builder or expert. With tha...

I’ve been discussing this same topic (Line/Neutral wiring on JMI Vox) on another forum, and I still haven’t come up with any decisive reason why Vox would have wired the Line (after fuse and switch) going to PT common/0v and Neutral going to PT Primary voltage input. But the consensus seems to be th...

I’ve seen this wiring on a number of JMI Vox schematics and in photos of actual amps. But strangely, not all of them. Here is the power section from the AC30: 7B390275-A080-4238-AD57-C68FA0009F99.jpeg Sometimes the fuse is on the Live wire, sometimes on the Neutral. Most all JMI Vox schematics depic...

1EEF5A56-2B26-4D78-90EB-A90689C99E48.jpeg I’ve been assembling an AC15 clone using the 1960 schematic, and Stephen Grosvenor’s Service Engineer’s Guide to the Vox AC30. I’ve noticed in several JMI Vox schematics that the live mains lead is fed to the PT Primary common (post fuse and switch), and th...