Voltage drop

[Captain Kilowatt]

Any and all thoughts and suggestions are welcome. Just installed new cap bank and diode board. Going to fire it up in a bit. See what happens.

Well I saw a bright flash and heard a loud BANG!!! but I guess it wasn't your amp. Turned out to be the 480 volt 1500amp three phase slip rings on a machine at work. Second time in less than 12 hoirs. First machine just welded the brushes to the rings. Second machine is down a couple days. After we put the fire out we started looking for missing pieces. Better wear eye protection when you plug that beast in.

 

[Crusher]

Anytime I fire up an amp. I have at least safety glasses and gloves on. Sometimes even earplugs. LOL.

 

[BJ radionut]

And a plastic broom handle...not a bad idea either
All the Best
Gary

 

[Captain Kilowatt]

Maybe even wear one of these. Throw a ground lead on it for added protection.

 

[Crusher]

I also have a pair of class 1 or class 2 electrical gloves with the proper leather gloves that fit over top. Ya never know.

 

[wavrider]

Did you apply power to the tr? What was the results.

 

[Crusher]

Its up and running. Making a few last minute modifications to bias. But amp is up and running. Did a 250w carrier and it swings up to 800w average. Over 1600 pep. Bias had 15v of bias, but I'm putting around 18v now. It should run a bit cooler. I was driving it with a pair of 1446 transistors. Its a lot of drive, but I wanted to make sure it will hold together. Also after I'm done. Will install a 10k -15k resistor across diode bank in case it fails. It has a 1.5a fuse, he has blown it at least 10 times that I have known. So that is why I am adding a bit more bias to calm it down some more. Plate sits at 3kv and drops to about 2700vdc under load.

 

[Crusher]

After its all said and done, I think it was the 1ohm 10w resistor that failed.

 

[wavrider]

Glad you got it up and running. Thanks for posting the results.

 

[Crusher]

Thanks to everyone that passed along thoughts and things to check.