|
Vintage Asylum Classic gear from yesteryear; vintage audio standing the test of time. |
|
|
|
Vintage Asylum Classic gear from yesteryear; vintage audio standing the test of time. |
|
In Reply to: Is an unused Yamaha CR 820 a fire hazard? posted by Vegman70 on November 15, 2020 at 10:27:37:
You need a dim bulb tester.
I you are not familiar what what that is get back and I can tell you how to build one from parts from a DIY or "electicians" store.
It is better than waiting for the fuse to blow as something loses its smoke. The DBT limits current and almost completely prevents any further damage. It is better than a variac and is nowhere near as costly. I think you can throw one together for ten bucks.
Turn it on and the (INCANDESCENT) light will light and dim down as the main caps charge. Then it when you look for smoke.
If something does smoke let it and be sure. Then on the board it may say "R134" or some shit. Then we get the print and see where that is in the actual circuit. In some cases I can tell you pretty surely what to replace. And do as thou wilt on the caps, but get it working first. Always.
Once it works, MAYBE recap some and test, if it doesn't work look at the most previous work, then more caps then more caps until done, maybe by board. Whatever. But don't just do them all at once in the whole thing. If one little thing goes wrong you could be, well the technical term is fucked.
Few capacitors in most equipment can cause the failure of other components. It can happen but not as much as many think it would. Then your transistors and diodes, all those don't get bothered by sitting idle like caps sometimes do.
When that bulb dims down it should work fine into cans. If so, turn it all the way down and connect speakers. Note them the might get brighter as you turn it up. Then turn it down and take a screwdriver and hit it all over the place with the handle. At zero output there should be no increase in the brightness of the bulb. If it does it has a bad connection that WILL destroy components and then it has to be looked over by someone experienced in that.
If all goes well up to this point plug it directly in the wall, (never put bypass switch on a DBT) and crank it up some on speakers.
LISTEN to it. Some units had really good caps, you do NOT want to replace those unless they went bad. If it sounds thin or muddy it might really benefit from some caps. But if it is shaking the floor, dimming the lights and sounds great, the technical term for that procedure is fukit.
This post is made possible by the generous support of people like you and our sponsors:
Follow Ups
- RE: Is an unused Yamaha CR 820 a fire hazard? - JURB 22:34:50 11/15/20 (0)
Top of Page ]
[ Contact Us ]
[ Support/Wish List ]
[ Copyright © 2024, Audio Asylum, all rights reserved ]