mikeymike
Well-known member
can anyone tell me what that is that is burnt? It looks like a resistor to me.. Which tubes does it affect (channelwise). thanks for your time guys
msi said:It's probley a grid resistor. According the the schematic for the 2:100 there are four 1k 2 watt resistors per channel. Or one resistor for each tube. What probley happend is the tube shorted out or the socket shorted out, and the resistor burnt up. You should take it to get it fixed. I don't know how much it's going to cost you though. Depends on the techs where you live. I would susptect it shouldn't cost more than 150 dollars, so even then you still got a great deal.
msi said:It's probley a grid resistor. According the the schematic for the 2:100 there are four 1k 2 watt resistors per channel. Or one resistor for each tube. What probley happend is the tube shorted out or the socket shorted out, and the resistor burnt up. You should take it to get it fixed. I don't know how much it's going to cost you though. Depends on the techs where you live. I would susptect it shouldn't cost more than 150 dollars, so even then you still got a great deal.
leadfootdriver said:Yep, screen grid resistors. They're like a few bucks. It might be hard to find the exact brand replacement, but you could find an equivilent no problem at your local electronics store. Do it yourself for nothing. Search for soldering, and desoldering tips if you don't know how. This is a real cheap fix.
Make sure you buy new tubes though so it doesn't happen again. Laughing Wink
mikeymike said:leadfootdriver said:Yep, screen grid resistors. They're like a few bucks. It might be hard to find the exact brand replacement, but you could find an equivilent no problem at your local electronics store. Do it yourself for nothing. Search for soldering, and desoldering tips if you don't know how. This is a real cheap fix.
Make sure you buy new tubes though so it doesn't happen again. Laughing Wink
Yeah I am able to do that sort of thing myself. I'd really like to replace it with the right brand though. Can you tell me more about blowing these? What causes them to blow? Also what do they do? What do they resist, will it harm the tube? The tube that it's lined up with has a broken key. Do you think the previous owner could have inserted it wrong and blown the resistor?
I really appreciate your responses guys. This forum is awesome. By the way the guy is claiming nothing is wrong with it and that any damages were done by shipping.
Can you tell me more about blowing these? What causes them to blow?
The tube that it's lined up with has a broken key. Do you think the previous owner could have inserted it wrong and blown the resistor?
By the way the guy is claiming nothing is wrong with it and that any damages were done by shipping
msi said:If your comfortable doing the repair yourself do it yourself. According to the schematics I've seen it's a 1k 2 watt resistor. The resistor is pretty standard across the dual rectifier brand. If you want to be certain of the value measure the other resistors with a multimeter. Remember that there is a 5-10% variance allowed on the resistor value. Meaning they can measure anywhere from 900 ohms, to 1.1k. The brand shouldn't make a difference. Get a decent quality resistor and you should be fine.
RobertH said:From the sounds of it, before you stick your paws in that amp call around and get yourself some good life insurance :wink:
RobertH said:No I don't think it's that messed up, but the fact that you couldn't tell for sure if that was a resistor or not leads me to believe that you may be getting a bit over your head. This isn't a transistor radio, it can hold some pretty ugly voltage inside if not dealt with correctly and instead of a simple fix that would take a qualified tech about twenty minuets to perform you'll end up possibly having a really bad day. Just looking out for ya. :wink:
RobertH said:Good luck, sounds like you know what you're doing.
timv said:He wasn't trying to be a jerk and say stay out of there but since you posted you knew to stay away from high voltage caps but don't know that the one side of that resistor is connected to the high voltage, you might want to be very careful, unplug the amp and turn the power and standby switches to on and let it sit for several minutes, this will help drain the power....
With that resistor blown, that tube wasn't working anymore. It is easy to replace.
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