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  1. Replies
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    Ok. I had thought that connector carried AC to...

    Ok. I had thought that connector carried AC to the other board. If it's the +/-25VDC, and the other board derives it's voltages from there, then yes that may be why the fuses blew. You could...
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    Well, some of us get cranky about having to go...

    Well, some of us get cranky about having to go find it ourselves. ;)

    So there is no diagram for the aux. supply. Maybe post some pics and others might want to suggest whether to try a repair on...
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    Link to schematic: ...

    Link to schematic: https://support.fender.com/hc/en-us/article_attachments/115007680846/Spellbinder_Blue_Schematics_and_Layout.pdf
  4. Thread: Tube tester

    by g1
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    258

    I'm not seeing a cut insulator. I see a couple...

    I'm not seeing a cut insulator. I see a couple cardboard shims that may have been wedged in there to try and quiet down a buzzing transformer?

    Echo Canyon, don't give up yet. If the seller won't...
  5. I hope you mean you traced to each bus on both...

    I hope you mean you traced to each bus on both sides of the circuit board.

    Can anyone post the schematic/service manual?
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    Yes please comment. Even though the original...

    Yes please comment. Even though the original post was 8 years ago, your information can still help others with similar problems.
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    Some people do notice a difference in harmonic...

    Some people do notice a difference in harmonic content. I seem to recall loudthud posting scope shots of the difference in the waveform with the diodes added.
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    Well at least try not to get killed, ok? :D

    Well at least try not to get killed, ok? :D
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    Completely agree. It's pretty sure there is a...

    Completely agree. It's pretty sure there is a bad connection along the heater string somewhere. You can visually inspect and check resistance and everything might look good but still can't deliver...
  10. Is this double-sided circuit board?

    Is this double-sided circuit board?
  11. Replies
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    Yes it's too high. You want to be using a 50 or...

    Yes it's too high. You want to be using a 50 or 60 watt bulb.
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    I'm not sure the point of that, I'm sure we can...

    I'm not sure the point of that, I'm sure we can agree to call it average or RMS and mean the same thing, it's just semantics and does not affect the question about the formula.
    As far as I know, if...
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    The top post links to a thread on another forum. ...

    The top post links to a thread on another forum. That thread has a couple different Herzog schematics. Randall mentioned the one with the int. and ext. fuse, so I posted that schematic in post #5....
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    In this case (DSL1) they don't offer any ext....

    In this case (DSL1) they don't offer any ext. jacks (head or combo) and specifically warn about possible OT failure if used with loads below 16 ohms. They don't seem that confident about it, and I'd...
  15. I think when you plug into the footswitch jack...

    I think when you plug into the footswitch jack with an open cable (no footswitch) it may be normal for it to mute.
    The problem may still be a faulty footswitch.
    The easiest thing right now for you...
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    Maybe you can buy the same 'grade' replacement...

    Maybe you can buy the same 'grade' replacement bulbs direct from Fender. ;)
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    329

    If you hear a hiss that goes away when you turn...

    If you hear a hiss that goes away when you turn the volume to zero, that is sound.
    Turning up the hiss with the volume control is going to make the idle current increase. It's not really idling...
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    You are not answering the question about what you...

    You are not answering the question about what you are hearing through a speaker.
    Any hum, or frequency above or below our hearing will change the tube idle current when the master is not at zero....
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    So there is no sound or hum that increases when...

    So there is no sound or hum that increases when volume is turned up?
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    Here is the schematic: ...

    Here is the schematic: https://music-electronics-forum.com/attachment.php?attachmentid=54045&d=1560974103
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    They don't balance out all that perfect. What...

    They don't balance out all that perfect. What are the idle DC voltages across those 3.9ohm resistors at the emitters of T3 and T4?
    In the music man, they are biased for around 25mV across each. ...
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    Yep, there are more than one set of ZD1 and ZD2. ...

    Yep, there are more than one set of ZD1 and ZD2. We're talking about the ones in the footswitch circuit. ;)
    See around the footswitch jack on pg.3 of schem.
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    The Fu type is fusible, the F type is flameproof....

    The Fu type is fusible, the F type is flameproof.
    Someone has upgraded R71 from the original flameproof design, to a temperature dependent type. It may have been a factory improvement, or someone's...
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    You might be looking at it backwards. ;) (why is...

    You might be looking at it backwards. ;) (why is tube conducting more when volume is raised above zero)
    Hum or oscillation could be reasons.
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    You might find 'liquid tape' at a hardware store....

    You might find 'liquid tape' at a hardware store. It's not as good and may take a couple layers. The important spec. is dielectric strength in V/mil, corona dope is around 4000, liquid tape more...
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    I would try replacing the plate resistor. It's...

    I would try replacing the plate resistor. It's already high, and may be going higher only when subjected to voltage.
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    Pete Traynor also liked this trick. And his...

    Pete Traynor also liked this trick. And his YBA-3C is the only amp I'm aware of that called for a particular voltage across that shared screen resistor to set the bias. So biasing according to...
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    Have you tried the new Boss RE-20 pedal? A bit...

    Have you tried the new Boss RE-20 pedal? A bit pricey, but not compared to what the used RE-201's are going for!
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