Reply With QuoteE-w-w-w-w-w, that big filter cap and around it definitely isn't looking good! Actually, the cap may just be singed--looks like it was the resistor below it that went up in smoke.
Calling Tung, calling Tung.....come in, Tung!
Oranges and lemons, say the bells of St. Clements...
Not Happy New Amp Day
How bad does it look?
I just got this used Fender Pro Jr from UPS, so I installed the tubes, powered it up and smoke started coming out of them within seconds.
I opened it up and this is what I saw -
The Law of Gravity is nonsense. No such law exists. If I think I float, and you think I float, then it happens.
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Addicted to solder....
E-w-w-w-w-w, that big filter cap and around it definitely isn't looking good! Actually, the cap may just be singed--looks like it was the resistor below it that went up in smoke.
Calling Tung, calling Tung.....come in, Tung!
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Regular Fretter
Ewwwwwww. Someone call that amph a doctah!
I hope it's a cheap fix, Robert.
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I'm not an amph doctor, but it's just a cap and a few resistors. The real issue is what caused the blow out.. perhaps you didn't seat the tubes properly.
Addicted to solder....
Here's a photo off Bill Machrone's site that shows how that section of the board should look. Looks to me like R32, the resistor below the 22 uf filter cap, is what let go:
Yeah, exactly. And pray that it didn't take out the power transformer with it....Originally Posted by bcdon
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Master Fretter
Is that picture a modded board? It looks like there are a couple of wires -- one yellow and one blue -- that aren't in Robert's photo. Maybe those had something to do with it?Here's a photo off Bill Machrone's site that shows how that section of the board should look. Looks to me like R32, the resistor below the 22 uf filter cap, is what let go:
Don't know, just my uneducated observation...
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Addicted to solder....
Good point! Those wires are part of one of BillM's mods for his Pro Jr. I was just trying to show what the unsinged components in that area of the board were....
BTW, here's a link to a Pro Jr. schematic:
http://www.ampwares.com/schematics/pro_jr.pdf
Looks like R32 is a 2.7 Kohm 2W power resistor that steps the B+ voltage down from 319 VDC to 294 VDC.
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Regular Fretter
Robert it's not the 4th of July yet! I heard those were some bad caps but WOW! I haven't seen 'em light up like that before.Good luck with that one.Sumi
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Regular Fretter
That's ugly.
Play your guitar daily!
playin' from the heart
Do you think you may have any recourse with the seller?
Regular Fretter
No way 2 know in hindsight, I s'pose, Robert...but...assuming that you know how to put tubes in correctly, could that damage have been done by the previous owner, which is why they were selling it in cyberspace, not face-to-face?
Their extortionate (isthataword?) fees aside, as bad as UPS can be (to whit: "What can Brown Do for You?"), blaming that frito-boardito on them may be a tad over-the-top. Although it is possible a solder joint cracked or connection came loose in transit, that could happen with the amp in the trunk of anyone's car hitting a bump in the road.
I think the amp was fried b4 it was packed and sent to you.
Regular Fretter
Ah Kimosabe how can I help,I saw your smoke signal.Sumi
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Oranges and lemons, say the bells of St. Clements...
Who knows what happened to the amp. I can't say for sure. I think I know how to put in tubes correctly, but I should have looked at them as powered up the amp. Perhaps one of the tubes are busted.
The seller already offered to take it back, but I don't want to have spent all this UPS rip off fees for nothing. They charged me over $130 just to let me have this amp, so I would rather get it repaired than to put more money in their nasty little pocketses.
The Law of Gravity is nonsense. No such law exists. If I think I float, and you think I float, then it happens.
Master Guitar Academy - I also teach via SKYPE.
Valar Morghulis
Grrrrrrr!
At least it is repairable.
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Oranges and lemons, say the bells of St. Clements...
Thanks Vood for the schematics link! I dropped it off to a repair guy this morning and he said he needed the schematics before he could go anything. Now I am crossing my fingers that the amp can be fixed without costing me a fortune.
The Law of Gravity is nonsense. No such law exists. If I think I float, and you think I float, then it happens.
Master Guitar Academy - I also teach via SKYPE.
playin' from the heart
I think you and I are being punished for something ~
or maybe out neighbors don't like our loud playing and sabotaged our amps
Super Duper Fretter
Correct. That node is the B+ supply for the EL84 screens. The one good thing is that the resistor blew on top of the board, i.e., not on the trace side. The carbon can cause problems later on if it gets on the PCB's traces.
It is a fairly simple circuit, so any good tech should be able to fix it.
My guess based on the photos is that either one or both of the EL84's screen grids were damaged in shipping; they are not the most robust of tubes. But it is hard to say for sure as I don't have the amp in front of me. Your tech should probably check all the tubes to make sure they are good.
You will want to have the tech check R24 and R25 to make sure they aren't toasted as well. Those could be increased in size. right now they are 100 ohm. Anywhere from 470 ohms to 1.5K ohms would provide more protection for the EL84 screens.
Finally, I've heard bad things about the Illinois caps (marked "ic"). Depending on the age of the amp, you may consider having those replaced when the amp is serviced.
Sorry about your misfortunes with the amp, but hopefully it should be relatively painless to have it fixed.
Regular Fretter
Noooooooo!!!
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Oranges and lemons, say the bells of St. Clements...
The Gods are punishing me... perhaps because I have too many amps now?
The Law of Gravity is nonsense. No such law exists. If I think I float, and you think I float, then it happens.
Master Guitar Academy - I also teach via SKYPE.
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