This should be chocked full of dumb questions so please bear with me.. And sorry in advance.
I'm trying to get a 1963 console back up and running after letting my ADD get the best of me. I had powered up the 480A with a Variac, it ran fine for a while, then while looking at the tubes and noticing one brighter than the rest, I decided to touch it.. Bad move, it shorted out internally than actually cracked. I turned it off and unplugged it within a few seconds. I had also turned the bias knob about a MM prior to this (I was cleaning it with my finger to actually just see what it was). Add another variable: I had just sprayed deOxit into the socket a half hour prior to any of this.
I had another EL84 that I put into the socket the next day and turned it back on. Everthing appeared to power on correctly, but with no sound.. Nothing, not even a hum.
I had another thread on this that some fine folks gave me some advice, but decided to start a new thread on just troubleshooting it. I started replacing the caps, I did the black cardboard 100uF (C15) because I had one laying around, the rest of the caps I'm hoping to pick up at the antique radio show/swap meet/Flea Market that is happening this Friday and Saturday at Kutztown PA.
Does this sound like I may have fried the output transformer? (I would be really bummed if I have).
I tested the OT by just checking continuity between PIN 3 on the sockets, it's good, also tested the two silver diodes, power is going in the right direction. but can anyone tell me a good way to test to see if I freid her? Can I do this on a bench without speakers hooked up? Guessing I should pull the tubes to test trans? Better to use a variac at low V to do this? Do I need to pull the wires?
I guess what I'm looking for is a link to a step my step method..
I'm very new to tubes and Fisher but I really want to learn. Thanks in advance to anyone who can help me out!
Here's a link to the thread I started the other day on this:
http://www.audiokarma.org/forums/showthread.php?t=591480
-Tom
I'm trying to get a 1963 console back up and running after letting my ADD get the best of me. I had powered up the 480A with a Variac, it ran fine for a while, then while looking at the tubes and noticing one brighter than the rest, I decided to touch it.. Bad move, it shorted out internally than actually cracked. I turned it off and unplugged it within a few seconds. I had also turned the bias knob about a MM prior to this (I was cleaning it with my finger to actually just see what it was). Add another variable: I had just sprayed deOxit into the socket a half hour prior to any of this.
I had another EL84 that I put into the socket the next day and turned it back on. Everthing appeared to power on correctly, but with no sound.. Nothing, not even a hum.
I had another thread on this that some fine folks gave me some advice, but decided to start a new thread on just troubleshooting it. I started replacing the caps, I did the black cardboard 100uF (C15) because I had one laying around, the rest of the caps I'm hoping to pick up at the antique radio show/swap meet/Flea Market that is happening this Friday and Saturday at Kutztown PA.
Does this sound like I may have fried the output transformer? (I would be really bummed if I have).
I tested the OT by just checking continuity between PIN 3 on the sockets, it's good, also tested the two silver diodes, power is going in the right direction. but can anyone tell me a good way to test to see if I freid her? Can I do this on a bench without speakers hooked up? Guessing I should pull the tubes to test trans? Better to use a variac at low V to do this? Do I need to pull the wires?
I guess what I'm looking for is a link to a step my step method..
I'm very new to tubes and Fisher but I really want to learn. Thanks in advance to anyone who can help me out!
Here's a link to the thread I started the other day on this:
http://www.audiokarma.org/forums/showthread.php?t=591480
-Tom