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  1. I would suggest that you also check the mosfet...

    I would suggest that you also check the mosfet that EXT is driving.
    Check to see that it is not shorted.
  2. Replies
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    TP1. 4mv @ 1KHz

    TP1.
    4mv @ 1KHz
  3. Something is not right. Either the IC or the...

    Something is not right.
    Either the IC or the mosfet. (or both)
    The EXT pin should be modulating the mosfet.
    Do you have a scope?
    The IC itself is a voltage regulator that will bring the battery...
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    Here is a good history on the 'Phillips'...

    Here is a good history on the 'Phillips' screwdriver: https://www.youtube.com/watch?v=R-mDqKtivuI
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    There goes my coffee! Got a real kick out of...

    There goes my coffee!

    Got a real kick out of his gloves catching on fire (@ 3:06)
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    Good reading:...

    Good reading: http://thevalleywoodworker.blogspot.com/2016/01/the-many-faces-of-phillips.html
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    Yes. The transistors are in parallel. So one or...

    Yes.
    The transistors are in parallel.
    So one or more shorted will show up as all shorted in circuit.

    56620
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    I agree with defining the board #'s. There is a...

    I agree with defining the board #'s.
    There is a Kustom II bass, guitar & a PA amp.
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    It seems to me that what you are reading is two...

    It seems to me that what you are reading is two grid resistors in series.
  10. I would look for one of the low voltage power...

    I would look for one of the low voltage power rails being missing.
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    "Download certified opera 10.62 uninstaller".....

    "Download certified opera 10.62 uninstaller".. would you think this is safe to click on?"
    No idea.
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    Same thing. But better! N Channel MosFet:...

    Same thing.
    But better!
    N Channel MosFet: https://www.onsemi.com/pub/Collateral/FDD5612-D.PDF

    Can you supply us with the part # of IC 381 & it's brother?
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    Try this....

    Try this.
    http://www.uninstallapp.com/article/How-to-uninstall-Opera-Browser-10.62.html
  14. Wow. I remember those guitars. Space Age...

    Wow.
    I remember those guitars.
    Space Age Lucite!

    Quick connect pickup was a good idea but the guitar itself needed to be routed out to let the pickup slip in.

    56530 56531 56532
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    "At any rate, TR360 and TR362 appear to be on the...

    "At any rate, TR360 and TR362 appear to be on the secondary side of the SMPS.
    It looks like they are coming off the switching transformer secondary (which makes no sense to me. I would expect...
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    Having trouble finding a 1B35AA datasheet. An...

    Having trouble finding a 1B35AA datasheet.
    An obscure reference was found to a IRF840.

    At any rate, TR360 and TR362 appear to be on the secondary side of the SMPS.
    It looks like they are coming...
  17. Replies
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    "so would it be accurate to say that the preamp...

    "so would it be accurate to say that the preamp tube volumes are controlled by the Volume control & the power tubes by the Master control in this amp/"

    Yes. That is correct.
    In a very simplified...
  18. Replies
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    Yup. An ICEpower 50ASX2. In the photo, the...

    Yup.
    An ICEpower 50ASX2.
    In the photo, the items on the right are the power supply.
    Everything to the left of middle is the power amplifier.
    Two different entities.
    Two different ground...
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    The Master Volume is just that. "15. Master...

    The Master Volume is just that.
    "15. Master Volume
    This controls the overall volume of your amplifier. Turning it clockwise increases the
    volume."
    It is a 'post preamp' control....
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    Truthfully, I posted the procedure more for the...

    Truthfully, I posted the procedure more for the balance adjust.
  21. Replies
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    Attached is the bias and balance procedure: 56510

    Attached is the bias and balance procedure: 56510
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    If I am reading the schematic correctly, F4 is IN...

    If I am reading the schematic correctly, F4 is IN SERIES with the HT winding.
    If F4 is OPEN then you will not get a reading across SP1 & SP2.
    Please replace the fuse & try again.
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    "I have a $7 component analyzer that tests for...

    "I have a $7 component analyzer that tests for ESR amongst other things"

    I bought one of them myself....
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    Have you located F4? ...

    Have you located F4?

    https://music-electronics-forum.com/attachment.php?attachmentid=56504&d=1577927060
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    I went looking at other HT schematics and came...

    I went looking at other HT schematics and came upon the HT1.
    On that schematic they show the tube heaters coming directly off of the LT windings.
    That may be where SP14 & SP15 originate.
    56507
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    Alright. After poring over this goofy schematic...

    Alright.
    After poring over this goofy schematic I have come to a few realizations.
    - I find it odd that the HT is not fused.
    Well, it may be.
    By F4. (SP12/ SP13)
    56504

    I will bet that you...
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    That transformer is bad. And you need a new...

    That transformer is bad.

    And you need a new fuse clip.

    EDIT: ignore the CT info as the transformer HT does not utilize one.
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    I believe what failed is the HT winding. That is...

    I believe what failed is the HT winding.
    That is the High Tension winding.
    Some 400 volts.
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