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| | |-+  HT fuse blew		 « previous next »
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Author Topic: HT fuse blew  (Read 4552 times)
bolso103
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« on: February 05, 2010, 11:20:02 PM »
Hello,

The HT fuse of my Ceriatone JTM45 blew today. I am using the amp since December. Could anyone help me? I can measure voltages if necessary.

Regards,
Gabriel
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cmoore
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« Reply #1 on: February 06, 2010, 12:36:28 AM »
 Do you have any idea why the fuse gave up?
If there are no obvious problems, I would pull the power tubes,  fire up the amp, and turn off  the stand by (put it in play mode) . If you want to read voltages, (plate, bias, screen, etc.) go ahead. If the fuse does not blow, turn off the amp, put the tubes back in, turn the amp back on and see what happens.
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bolso103
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« Reply #2 on: February 07, 2010, 11:09:23 AM »
Quote from: hired hand on February 06, 2010, 12:36:28 AM
Do you have any idea why the fuse gave up?
If there are no obvious problems, I would pull the power tubes,  fire up the amp, and turn off  the stand by (put it in play mode) . If you want to read voltages, (plate, bias, screen, etc.) go ahead. If the fuse does not blow, turn off the amp, put the tubes back in, turn the amp back on and see what happens.

Hello,

I think the OT is fried. I was playing guitar, and then I saw much smoke and started to smell a intense smell.
I do not know an obvious reason. The bias was right. MAYBE the problem was that the amp was connected to the speaker with a common 1/4" guitar plug, and it could not hanndle much current...
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cmoore
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« Reply #3 on: February 07, 2010, 04:32:43 PM »
The instrument cable is a bad idea, but does it (the cable) still work?  Could be a coincidence, but smoke and smell are a bad sign. Something died in your amp, smoke and smell is usually associated with caps and transformers. Start with a visual inspection. To measure DC resistance of your OT you will have to disconnect the wires, unless the OT is obviously a lost cause.
Good Luck
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bolso103
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« Reply #4 on: February 10, 2010, 02:54:03 AM »
Quote from: hired hand on February 07, 2010, 04:32:43 PM
To measure DC resistance of your OT you will have to disconnect the wires, unless the OT is obviously a lost cause.
Good Luck

Should I test continuity between the cables of the secondary?
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