Dead Renegade - No Power - F2 Fuse Issue

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PeteyMac

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Hi all and happy holiday's,

Recently at rehearsal, my Renegade abruptly quit working on me...i.e. no power at all (no fan, no light, etc). I checked the fuse located in the AC input with my meter, but it was still good...same with the power tube fuses. Next I pulled the chassis and started checking the fuses on the PCB. The culprit was f2. It looked like it was probably a 5 amp 250v slow blow, so I went to my nearest Radio Shack and bought a 4 pack. I installed the new fuse, turned on the amp, but once again, the fuse blew. I pulled the power tubes and tried again...same result - the fuse blew...I don't see any apparent problem...i.e. leaky electrolytics, burnt resistors, etc. Has anyone ever had this problem? If so, can you share as to what the problem was? The amp is only 2 years old...hate to think it was the PT, but it's kind of looking that way. Thanks in advanced.
 
Sorry to hear that :aww: ..Someone here has had the same experience recently (it was a bad tube )and,if i remember correctly,,there was also a burned resistor. Good luck!
 
Thanks...Since I don't have any power at all it's probably not tubes though...I actually pulled the power tubes and the fuse still blew. This is also one of the fuses on the Power PCB...the one with filter caps. It could be a resistor I guess, but I checked most of the resistors with my meter and I do get a reading...plus you can usually spot a bad resistor - or at least one that has been toasted. There are 4 fuse boxes on the PCB and I'm pretty sure they're there to protect the circuitry and PT. I haven't checked the switch for a short...it could be the problem. I'm just hoping it's not the PT. I have a call and email into Egnater, so we'll see what they come back with. Thanks again for the reply.
 
Update...Nate from Egnater got back to me with some local service centers yesterday, so I brought in my Renegade to a place in Chicago called Third Coast Guitars. Pretty cool place...very nice people. The estimated a 2 week turn around and also suspect it is the PT. I'll give an update when I get it back.
 
A bad power transformer would not cause that fuse to blow so don't panic. Suspect the big bridge rectifier or the chassis mounted 2N3055 pass transistor....or some other component in the low voltage power supply.
 
Thanks Bruce. That's great news. Hopefully that will bode to getting the amp back quickly.
 
Just an update...One month later and still waiting on repair. It's kind of weird...I brought it in suspecting a PT...the tech suspected the same. After Bruce emailed be about the rectifier, the tech called me back and said the same and was waiting on the parts. A 9 days ago the tech calls me back and said he had replaced the rectifier, but when he was testing, the amp blew again. He now says it the PT shorting out and is waiting on a shipment for a new one. What I find it strange that he suspected the PT from the beginning, but never tested for a short? Anyway, the wait goes on...
 
PeteyMac":2f7d2xij said:
Just an update...One month later and still waiting on repair. It's kind of weird...I brought it in suspecting a PT...the tech suspected the same. After Bruce emailed be about the rectifier, the tech called me back and said the same and was waiting on the parts. A 9 days ago the tech calls me back and said he had replaced the rectifier, but when he was testing, the amp blew again. He now says it the PT shorting out and is waiting on a shipment for a new one. What I find it strange that he suspected the PT from the beginning, but never tested for a short? Anyway, the wait goes on...
Click to expand...

Sorry to resurrect this thread, but i was curious as to what came of this. After what i've read here, it seems like perhaps the low voltage winding in the PT is shorted.
 
MississippiMetal":2rrt6uar said:
PeteyMac":2rrt6uar said:
Just an update...One month later and still waiting on repair. It's kind of weird...I brought it in suspecting a PT...the tech suspected the same. After Bruce emailed be about the rectifier, the tech called me back and said the same and was waiting on the parts. A 9 days ago the tech calls me back and said he had replaced the rectifier, but when he was testing, the amp blew again. He now says it the PT shorting out and is waiting on a shipment for a new one. What I find it strange that he suspected the PT from the beginning, but never tested for a short? Anyway, the wait goes on...
Click to expand...

Sorry to resurrect this thread, but i was curious as to what came of this. After what i've read here, it seems like perhaps the low voltage winding in the PT is shorted.
Click to expand...

I ended up needing a new PT. It worked fine until practice on Friday...i.e. the amp is dead again. posting.php?mode=quote&f=26&p=1342868# Now I'm past warranty and will most likely need another PT...on my dime. Of course, I could be jumping the gun, as I haven't pulled the chassis yet. I'll keep you posted.
 
Please contact josh@egnateramps.com and explain your situation. Yes, you may be jumping the gun so let's wait and see what is really wrong. It may be best to send directly to us so it does not take 8 weeks to fix, but Josh will figure that out.
 
Josh just called me. He said he wasn't heard from you yet??
 
Thanks Bruce. I've been tied up and haven't had a chance to get the amp on my bench. I'll send Josh an email tomorrow...
 
I haven't contacted Josh yet...I wanted to see if I could figure out what was going on. Okay, I did jump the gun...it's not the PT. I pulled all the secondaries, one at a time and got expected voltages...however, when I pulled the heater secondaries, the amp's LED's lit up. I guessing some sort of short or bad solder connection. I don't have schematic, but in my experience there's not much to the heater circuit. I'll reach out to Josh and see what he say's...a schematic would be helpful???
 
I emailed Josh, but never heard back...I traced the problem to the heaters. I was getting 6.3v out of the secondaries, but was not reading any voltage out of the tube sockets, when I plugged the secondaries back onto the connectors, the amp worked again...it's weird...I didn't really do anything except unplug the secondaries, so I'm guessing it was a connector issue. Seems good now though.
 
Sounds like perhaps you had an intermittent short between the heater circuit and LED circuit, or if both are on the same tap, perhaps an intermittent short to ground.
 
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