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Old 4th January 2010, 07:38 PM   #71
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@pchw .. my chassis is plexiglass, non conducting so I dont think anything is shorting, its basically like a wood panel that george uses on his website, I haven't made a proper enclosure or anything
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Old 4th January 2010, 08:02 PM   #72
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whoa.. it just hit me.. would running 1 channel with load (speaker) and the other channel without load cause the fuse to blow? cuz I've been testing with a single speaker...
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Old 4th January 2010, 10:51 PM   #73
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In general, you don't want to leave the secondary open without any load because the primary will see an extremely high impedance (infinite) when there is is no load on the secondary. I am not sure it can be the cause of blowing the fuse, but it will harm in the long run for sure. If you only have one test speaker, you can use a 4 or 8 ohm 20W resistor on the other side. Otherwise, you can test one channel at a time by unplugging the KT88 that without speaker.
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Old 5th January 2010, 12:26 AM   #74
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Quote:
Originally Posted by nukaidee View Post
running 1 channel with load (speaker) and the other channel without load...
...is a bad idea. Just don't do it. If you are testing an amp, always keep an 8 ohm dummy load or a junk set of speakers connected to both channels. Running the amp with no load can result in a shorted output transformer - permanent damage.
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Old 5th January 2010, 12:35 AM   #75
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oh boy.. how can i test my opt for damage? but it was only 30 min..
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Old 5th January 2010, 12:39 AM   #76
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i just cleaned up the wiring, made sure everything is connected good, checked solder points AGAIN and threw in a new 5ar4 by a different factory. Will test again tonight. still have 2 fuses left =)
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Old 5th January 2010, 01:00 AM   #77
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So, out of curiosity, what is the voltage across R17 and R27 while the amp is running? Is that voltage stable, or does it wander around a lot? I'm guessing if you are running KT88, you probably see about 40 volts across a 560 ohm resistor?
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Old 5th January 2010, 02:35 AM   #78
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might be my nickname is a clue, but what I'd be tempted to do, is go bigger on the fuse, see what burns and then fix it!! kidding, well kind of...
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Old 5th January 2010, 03:06 AM   #79
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hey sparky.. i actually considered that.. just getting rid of the fuse and connecting an ammeter to it with my hands on the plug.. lol
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Old 18th January 2010, 05:38 PM   #80
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alright... fired it up again today. its been 20 minutes.. everything seems normal. hoping it was a bad 5ar4 that i was using and this one is okay now.. its glowing quite a bit though, like wayy brighter than the rest of the tubes....
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