rudeboy
Full Member
Rudecaster into a Z...heaven.
Posts: 123
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Post by rudeboy on Apr 11, 2022 19:49:27 GMT -7
Older MAZ 18 NR, 2005 which I bought new. Swapped out original tubes about a month ago. Recommended set from "The Tube Store". After the swap no sound. Looked in back and the rectifier tube was not lighting up. Pulled it and reseated and it lit and she was sounding good. No issues till tonight. Was sounding good, swapped guitars adjusted a few tone knobs. All good. Swapped back guitars and nothing. Looked out back and it looked like the V3 was not lit so swapped out with the original tube. Still no sound. Put the new A2AX7 back in and looking closely it is lit, but dim. Swapped cords, guitars, nothing. Fuses are good. So to sum up. Power light is on, tubes are lit up. No sound. Any ideas?
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Post by zpilot on Apr 12, 2022 1:27:13 GMT -7
The statement about the intermittent rectifier tube makes me suspect that the failure is related to that. My first thought is that you have a bad connection at that socket. The rectifier supplies B+ to the rest of the tubes. That is separate from the filament voltage which lights the heaters in the tubes. Just because they are lighting up it doesn't mean they are getting B+ voltage. Could be a failed solder though I'd check that the metal clamps in the socket are making consistent contact with the tube pins. I've seen where when a tube was inserted the pin was misaligned and forced the clamp out of the socket housing. That caused only the tip of the pin to be making a poor contact. Of course it could be the rectifier tube alone.
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Post by j4gitr (John) on Apr 12, 2022 1:34:21 GMT -7
I had a similar problem years ago with my 03 Maz. It was a rectifier.
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rudeboy
Full Member
Rudecaster into a Z...heaven.
Posts: 123
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Post by rudeboy on Apr 12, 2022 3:47:40 GMT -7
Thanks for the replies. I'll put the old rectifier back in tonight after work, if that's not it I'll pull the chassis and look at the socket.
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Post by ME on Apr 12, 2022 5:40:07 GMT -7
Most likely the rectifier. Could be some collateral damage, but not always. ME
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Post by GuitarZ on Apr 12, 2022 9:24:30 GMT -7
If it's got some age on it, if you pull the chassis, give the tube sockets a nice cleaning.
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rudeboy
Full Member
Rudecaster into a Z...heaven.
Posts: 123
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Post by rudeboy on Apr 12, 2022 18:07:50 GMT -7
OK, put the old rectifier tube back in. Nothing. Pulled the chassis and nothing "looks" out of order. Used Deoxit on the tube sockets. Did the pots and switches while I was in there. Buttoned it up and put the new tubes in. Nothing. Old tubes back in. Nothing. I'm at a loss. Maybe time for a Dr's visit and a Mark II upgrade.
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Post by Chilly Gibbons (Todd T.) on Apr 12, 2022 18:13:31 GMT -7
You won’t regret the upgrade. You’ll love it.
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Post by purpletele on Apr 12, 2022 21:19:30 GMT -7
OK, put the old rectifier tube back in. Nothing. Pulled the chassis and nothing "looks" out of order. Used Deoxit on the tube sockets. Did the pots and switches while I was in there. Buttoned it up and put the new tubes in. Nothing. Old tubes back in. Nothing. I'm at a loss. Maybe time for a Dr's visit and a Mark II upgrade. rudeboy, Did you check you speaker wire? Maybe clean the speaker jack, You never know.
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Post by Jaguarguy (Mike) on Apr 12, 2022 21:29:58 GMT -7
How do you know fuses are good?? Looks can be deceiving with fuses.
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rudeboy
Full Member
Rudecaster into a Z...heaven.
Posts: 123
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Post by rudeboy on Apr 13, 2022 4:18:19 GMT -7
Thanks for the suggestions. I'll Ohm check the fuses just to be sure tonight. I did unplug the speaker jack when I pulled the chassis. Won't hurt to look again.
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rudeboy
Full Member
Rudecaster into a Z...heaven.
Posts: 123
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Post by rudeboy on Apr 15, 2022 19:17:06 GMT -7
Finally got to check my fuses (older model, has two). Slow Blow tests good, fast blow tests bad even though it looks fine. Of course I have no back-up for this amp. New fuses on the way...
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Post by premiumplus (Dave) on Apr 16, 2022 5:07:59 GMT -7
Put the new tubes back in before you fire it up...a bad tube is probably what blew the fuse.
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Post by daddyelmis (Greg) on Apr 16, 2022 8:13:26 GMT -7
Put the new tubes back in before you fire it up...a bad tube is probably what blew the fuse. And isn’t a bad rectifier the prime suspect with a blown fuse?
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Post by premiumplus (Dave) on Apr 16, 2022 9:52:33 GMT -7
Put the new tubes back in before you fire it up...a bad tube is probably what blew the fuse. And isn’t a bad rectifier the prime suspect with a blown fuse? Yeppir, I've had it happen more than once!
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rudeboy
Full Member
Rudecaster into a Z...heaven.
Posts: 123
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Post by rudeboy on Apr 20, 2022 17:36:01 GMT -7
Update: Just to let everyone know, fast blow fuse seems to be the culprit. Everything is functioning as it should. Thanks for all the help!
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Post by LT on Apr 20, 2022 19:37:21 GMT -7
I've been there with non-slow-blow fuses. You go to Home Depot/Lowes and buy em and then they don't work in our amps. I get mine from Mouser now.
Glad you got to the bottom of it!
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