Hello all, my first time posting. Thanks in advance for any suggestions.
My beloved Pro sits in my office. Last time I fired her up, she played wonderfully, a few months ago.
Tonight, I put my Kendrick reverb on top, turned on both, and the Kendrick lit up just fine, but.....no sound, no glow, no nothing from my sweet Pro. Moved the tubes around a little, no help. I've had her since 98, never a problem. Fuse is fine.
Any suggestions on what to try?
Is there a place that will help me understand the schematic?
Thanks,
Jim
65 Pro ----- no juice, no sound
Moderators: pompeiisneaks, Colossal
65 Pro ----- no juice, no sound
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martin manning
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Re: 65 Pro ----- no juice, no sound
Which Pro model is it? I'm guessing AB763 circuit w/ normal and vibrato inputs, GZ34 tube rectifier?
Do you have knowledge/skills/equipment to make measurements inside the chassis?
Do you have knowledge/skills/equipment to make measurements inside the chassis?
Re: 65 Pro ----- no juice, no sound
Fuse is fine? Sometimes they open on the end and may look fine cause you can't see the end. Test it,or replace it. BUT, what made the fuse blow? bad tube? If its not lighting up, meaning no tubes are glowing.
The indicator bulb can blow and amp looks like it may not be on.
Other things in the AC, would be the power cord, or switch in the amp is bad.
I would first pull the power tubes and rectifier tube. Replace the fuse with correct rating. Then see if it will power up.
Then power down, put the rectifire back in. Turn the amp back on. If it stays on. power down, and replace the power tubes, one at a time. If one is bad, it will blow the fuse.
IF, the amp does not power up after new fuse and removing the output and rectifier tube.[big tubes] Assuming your amp has a rectifier tube. Also do not mix up a 6L6 with a 5u4 or 5AR4 rectifier.
Then look at the power cord, and or switch, or outlet you have the amp plugged into. Usually a power problem is easy and fast to find why its not working using a volt meter. Some new amps[marshalls] don't have fuses anymore on the outside, they have them on the inside of the amp. Some transformers also have thermal overload gizmos inside them.
It could also be the PT itself. But try the simple stuff first.
Also important thing. if you have an amp or whatever left plugged in, and their is a storm or lightning strike, it can blow up your amp. So, if not using them, unplug them from the wall.
The indicator bulb can blow and amp looks like it may not be on.
Other things in the AC, would be the power cord, or switch in the amp is bad.
I would first pull the power tubes and rectifier tube. Replace the fuse with correct rating. Then see if it will power up.
Then power down, put the rectifire back in. Turn the amp back on. If it stays on. power down, and replace the power tubes, one at a time. If one is bad, it will blow the fuse.
IF, the amp does not power up after new fuse and removing the output and rectifier tube.[big tubes] Assuming your amp has a rectifier tube. Also do not mix up a 6L6 with a 5u4 or 5AR4 rectifier.
Then look at the power cord, and or switch, or outlet you have the amp plugged into. Usually a power problem is easy and fast to find why its not working using a volt meter. Some new amps[marshalls] don't have fuses anymore on the outside, they have them on the inside of the amp. Some transformers also have thermal overload gizmos inside them.
It could also be the PT itself. But try the simple stuff first.
Also important thing. if you have an amp or whatever left plugged in, and their is a storm or lightning strike, it can blow up your amp. So, if not using them, unplug them from the wall.