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Subwoofer thumping continuously
Hey there, its been a long time since I've posted on here but back when I used to mess around with amp ampage was always the most helpful place so I thought...
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Wagdog you actually bring up a good point about something that really surprised me when I opened this up...There are no other fuses in the entire amp!! Isn't...
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Found the problem! I was measuring from the IEC and then all of the switches individually and everything looked just fine, however when I measuring across...
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Thanks for your replies!
I've measured and I do have continuity on the PT's primary, when I measure from WHT to BLK/WHT I get about .7 ohms...
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Dual Rectifier no power, fuse not blown...
Hey everyone, its been a long time since I've posted here but I have a question!
A friend brought over his dual rectifier so we could do some...
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oh my, I'm now wondering if I've made a major blunder. when asking about the fuses I've always maintained I've got the right ones, and do in terms of amperage,...
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sorry the 340 is incorrect, I was reading one leg to ground and I had my meter on dv. across both legs of the winding is 490VAC. the B+ is about 650V, but...
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7ohms from CT to either side, and 170v AC from CT to either side. its all good here, I had checked this when stokes got me to check the PT. this is really...
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this is exactly what I thought too, so the first thing I checked was all the diodes but they seem fine, I can't say what I'm really looking for but the fact...
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haha yeah thanks Enzo, I was just joking, but yeah you guys were right about the 6550s and it being overloaded.
What I'm interested in now...
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alright so don't rub it in too hard, but there is too much current being draw with all 4 tubes.
NOW I know people have run this exact model...
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But if I run a 4 ohm cab with two tubes in an amp made for 4 tubes would that not mean I'd need to set the amp at 2ohms? I was always told this was the case....
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positively have the right fuses in there. 0.5 amp slo-blo, its printed right on the pcb and I just double checked the fuses i've been using.
...
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so this is interesting.
PT is fine, disconnected the HT and there is no glow.
I then tried each socket one at a time. power...
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I know, that was my point in saying that. If the short was in the heaters, it would light the bulb either in stand by or not. my point is that I don't think...
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is there any way I can test this with the dmm or scope? IE if I follow the 6.3v from the heater tap on the PT and watch for where it drops off?
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you probably don't want to read this whole thread:
http://music-electronics-forum.com/s...ead.php?t=2749
but its what has...
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alright so I tried it with no tubes, there is no glow either with standby on or off.
put the tubes in one at a time and then it glows a little...
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dimbulb tester is glowing bright
so I finally got around to making a dimbulb tester to test my jcm800 2203 as per this site:
http://www.antiqueradio.org/dimbulb.htm
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Enzo, I hate to tell you this, but you really are from mars.
You were dead on, it was Q7. It was shorting to ground.
I tried...
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