Joule Electra VZN 100 Need help


Not sure this is the venue to post this tale of woe but I'm in desperation mode.

I upgraded the power cables on these wonderful amps and managed to mis-wire one of the cables. These amps are NOT easy to work on.

Looking for some other VZN100 owners who could shed some light.

Yes I've written Joule (Jud) but got no help as yet.

It's very quiet around here...

Has to be one of the dumbest mistakes I've made in 56 years.
desalvo55

Showing 4 responses by desalvo55

The problem is that I rewired the power inlets (the ones without the fuse holder) and I'm pretty sure I mis-wired one of those, somehow, as I was damn careful. I was also under the illusion that they carried AC. My stupidity. The variac wiring seems straightforward and I'm almost certain that it is correct. Voltage appears normal on both amps but on the right amp, the power tubes don't light. On the left amp, they light too brightly when bringing up the voltage. This condition follows the amp if I reverse left to right. Anotherwards, the power cords don't seem to make a difference.

And after careful measurements with an ohm meter I made the wires match what the ohm meter would suggest is the same, banking on the amps are wired as mirror images. Thought I was on to something as it was so logical.. Now I have no voltages showing on either meters and no power to either amps power tubes. I pretty much "cooked my goose".
Hey guys thanks for the posts.

I brought this on myself by wanting to rid the amps of those cheesy power cords. Simple enough but it wasn't. I didn't take any pictures like a total idiot. I assumed they were wired identically like an idiot. They are not. I measured all points with an ohm meter so that the amps measured the same. Bingo. NOT. Now neither one of them work.

I brought them over to Nick Gowan of Truesound, a tube amp guru repairman. He took a look and was in what I would term as dismay. "Reminds me of the old Audio Note amps". I think he has doubts whether he can get these working without any pics or documentation. They look like they were built in a garage. I think they were!

I've taken pics and sent them to Jud's repairman but he referred me back to Jud who simply told me to put the old cords back in. Followup emails have been ignored.

If Nick and I even knew they were to be wired in a similar fashion, that would be extremely useful.

Checked and ohmed the fuses. Checked the bridge rectifier. Checked everything I could check. Nothing looks broken other than some bulging caps. A simple (not so simple)miswire with no roadmap.

I agree with Johnthompson regarding full power to one amp. I'll try to upload pics to Flicker to post link.

Appreciate the help!
Pretty worried at this juncture.
Got it sorted out myself. In the end, I really could find a mistake in wiring. I just trimmed and reset all the connections. But something happened. There's no hum anywhere and the amps sound even more amazing.

Thanks again for your help.
Wow, that is really great information.

I got no help, no love from Jud. But many fellow audio guys have really come to my rescue. When something breaks (or I break something) in my house, in about 1 day someone has a spare for me to use till I'm up and running. The wife is really impressed by us audio guys.

It's really cool to be a part of something that so many share a passion in and, generally have a really good core.

I think "reboot" was the answer.