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  1. Replies
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    Fixed it. I changed the 2n7000 again. Apparently...

    Fixed it. I changed the 2n7000 again. Apparently the first replacement was old and faulty. I pulled it out of a plastic parts bin. The new one came in today and I tried it and viola!
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    449

    thank you gentlemen. I shall check the peripheral...

    thank you gentlemen. I shall check the peripheral circuitry and get back with you. The zeners check ok.
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    Seriously, are you guys looking at the schematic...

    Seriously, are you guys looking at the schematic I put in my post? Maybe there is more than one ZD1 and ZD2? They are in series, with the cathode of ZD2 being grounded. They are back to back, or...
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    Not really seeing what ZD1 has to do with the...

    Not really seeing what ZD1 has to do with the switching. It's in series with ZD2 going in the opposite direction, then that pair is in parallel with ZD3 and ZD4 with the same orientation. I was...
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    449

    I have tried the foot switch, the one without...

    I have tried the foot switch, the one without LED's. Same thing happens. The LED just goes from bright to dim
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    Ok, so when the channel selector is in, and set...

    Ok, so when the channel selector is in, and set to the overdrive channel, the LED is bright. The gate of TR1 is at 1.813 volts and the drain is at 4.89 volts. When the Channel selector switch is out...
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    449

    At this point I have changed the DG212 IC,...

    At this point I have changed the DG212 IC, The2n7000 FET, and checked D9 because of a low reverse reading in circuit. (about .75v. with a diode checker) The diode was good.
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    Ok, yes I have checked the jack and operation...

    Ok, yes I have checked the jack and operation with simulating a foot switch and get the same results. I also checked the 5 volt supply on pin 12 of the DG212 IC and it's good. Thanks for your...
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    Marshall MG100DFX channel select issue

    Overdrive channel works fine. The push button switch which switches from clean/crunch to overdrive switches from a bright red to a dim red instead of on to off. I tried replacing the DG212 IC with no...
  10. Thread: Hardware help

    by booj
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    508

    Turned out to be 6-32 sae. The reason the screw I...

    Turned out to be 6-32 sae. The reason the screw I had wouldn't fit a 6-32 nut was because the end of the screw was buggerd a little DUH
  11. Thread: Hardware help

    by booj
    Replies
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    508

    g1, .5 is too fine. The threads actually mesh...

    g1, .5 is too fine. The threads actually mesh with a 6-32, but like I said, the screw won't fit in a 6-32 nut.
    Bloomfield. Interesting, but I think I'll just contact Line 6
    JM Goes into press fit...
  12. Thread: Hardware help

    by booj
    Replies
    9
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    508

    Hardware help

    Hi all,
    Trying to get a LIne 6 AxII chassis back together and I lost the screws that hold the two chassis pieces together. I have one screw to compare to. Looks just like a #6 SAE 1/2 inch but it...
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    295

    I think that's the clue I'm looking for. The grid...

    I think that's the clue I'm looking for. The grid of V6 and the grid of V7 are connected through R93 and to a plug con 7 which goes to cn202. Once I figure what those are and where they are I'll have...
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    295

    V5 1. 246.6, 2. 27.3, 3. 43.8, 6. 252.7, 7....

    V5 1. 246.6, 2. 27.3, 3. 43.8, 6. 252.7, 7. 25.9, 8. 43.9
    V6 1. 123.5, 2. -301mv 3. .966, 6. 168.6, 7. -146.4 8. 1.23
    V7 1. 249.4, 2. .6mv 3. 2.77, 6. 106, 7. -171, 8. .660
    V8...
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    295

    Marshall JVM 210H weak, noisy clean channel

    By weak, I mean in clean mode the amp only puts out 1/2 to 1/3 the volume it should be putting out. By noisy I mean that the control seems to have and I believe it does have a bit of DC voltage on...
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    The handle screws penetrate a cover plate for the...

    The handle screws penetrate a cover plate for the chassis. The chassis won't come out until that cover is free from the cabinet
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    Hughes & Kettner Duotone Disassembley

    44784

    Got it this far but the chassis is still hung up on something. Anybody have any experience with this beast?
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    couldn't agree with you more about the 220k...

    couldn't agree with you more about the 220k resistors. No sense to me at all. Thanks for the info. It will help greatly if I need to "go in with a drill"
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    Again;, thank you very much for the info. Makes...

    Again;, thank you very much for the info. Makes it a LOT easier to get a grip on this stuff. I'm 20 minutes east of St. Louis.
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    Thanks for the info. I'll so that.

    Thanks for the info. I'll so that.
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    1,148

    Excuse me. I didn't say they were unrepairable. I...

    Excuse me. I didn't say they were unrepairable. I said they were "deemed" unrepairable by the person(s) giving themn to me to fix. Other techs had given up on them. I just wanted to get some pointers...
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    1,148

    Excellent information, and the kind of help I was...

    Excellent information, and the kind of help I was looking for! I thank you most heartily timmyP1955!
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    1,148

    Marshall DSL 50 and 100 last hope

    Just got in two amps. Both of the rats nest type models. The 100 was deemed "unrepairable" and was offered to me to fix. the 50 was labled as "nothing but trouble since I got it". What I'm asking is...
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    The 5 outputs, their 47 ohm and 2.2k resistors,...

    The 5 outputs, their 47 ohm and 2.2k resistors, Q6, and C10. That was it.
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    Ok! I have more information. I don't know the...

    Ok! I have more information. I don't know the exact chain of events other than the amp being run hot on a hot day, but I did find that Q6 was shorted, which is directly connected to D6, the 13 volt...
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    Ampeg SVT 6 Pro shorted supply?

    40443

    Came in with 5 shorted outputs and a shorted 13v zener, which I replaced. At this point I can't find any shorts in the output section or the power supply. I can put a very few volts into...
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    I clip leaded a one ohm resistor between the...

    I clip leaded a one ohm resistor between the cathode of one output tube and ground after removing the fuse for that tube set. Curious that t the fuses connected to either the two outside or the two...
  28. Problem fixed. took out ALL lug connectors and...

    Problem fixed. took out ALL lug connectors and soldered the wires directly to the lugs. Left the ribbon cables alone
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