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  1. Replies
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    Grid wires to output tubes look OK to me. When I...

    Grid wires to output tubes look OK to me. When I do a layout for an existing board, I get a big sheet of paper and use the board to mark where all the eyelets are :)
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    In the late 80's I worked at a standalone musical...

    In the late 80's I worked at a standalone musical instrument repair shop. I got stuck with all the boomerang (they keep coming back) repair jobs. One of the boomerangs was an active guitar that was...
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    Question for Juan, how much (by percentage) could...

    Question for Juan, how much (by percentage) could the resistance of a speaker voice coil go up under conditions the OP describes without permanent damage ? Is 25% possible ?
  4. Welcome to the forum. Symmetrical clipping is...

    Welcome to the forum.

    Symmetrical clipping is the enemy of good tone. It sounds hollow. See this thread: https://music-electronics-forum.com/showthread.php?t=48223
  5. Thread: LED question

    by loudthud
    Replies
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    594

    I ran across an old Boss pedal that had an...

    I ran across an old Boss pedal that had an external supply jack, but it wouldn't run on the typical 9V pedal board supply. It wanted a special Boss 12V floating supply. The LED wasn't very bright.
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    If you can find a schematic, either post it or a...

    If you can find a schematic, either post it or a link to it here so everyone is on the same page.

    This is just a WAG, Wild Ass Guess. I'm assuming the circuit is basically the same as the RG-100...
  7. Thread: PCB grounding

    by loudthud
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    355

    In the USA, the square pad on an electrolytic cap...

    In the USA, the square pad on an electrolytic cap is the plus terminal, but we drive on the right side of the road. :) Just to avoid confusion, move the + sign on the silk screen from under the cap...
  8. What about the case where the guy bringing in the...

    What about the case where the guy bringing in the item to be repaired, doesn't really own it, he's still making payments ? More of a problem when repairing cars or houses.
  9. Replies
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    True, but a resistor doesn't get cold just...

    True, but a resistor doesn't get cold just because the Voltage in negative. When you square the Voltage or current term, that fixes the problem.

    Going back to pre-calculus, a unit sine wave...
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    Back to the topic... @olddawg, I have a solid...

    Back to the topic...

    @olddawg, I have a solid state power amp design that is about 20 or 25W into 8 Ohms and it runs off of a 40W wall wort. In a 5E3 cabinet with a neo speaker it would be pretty...
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    @uneumann, Last time I talked to GW he said he...

    @uneumann, Last time I talked to GW he said he had applied for a patent on a tremolo circuit that modulated the phase inverter. I opened one of his books and showed him the Fender 5E9A Tremolux...
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    It's not really an average value of Voltage or...

    It's not really an average value of Voltage or current, it's the equivalent DC value of Voltage or current that would give the same average power into a resistive load. Subtle difference.

    To...
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    Have you seen this ? Link:...

    Have you seen this ? Link: https://honeydripperamps.com/

    It's a little pricey.
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    Please post the exact schematic you are referring...

    Please post the exact schematic you are referring to, or a link to it.
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    With only 190V B+, a 5K primary will get you...

    With only 190V B+, a 5K primary will get you about 2 Watt. You should get one of those "Universal" OTs so you can adjust the primary impedance down to something below 2K where maybe you can coax 5W...
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    It''s worth mentioning that the chokes are...

    It''s worth mentioning that the chokes are different. The Sunn chokes are 1.5 Henry, DC resistance about 50 Ohms. Current rating is something like 300mA. The Screen only chokes are usually between 5...
  17. The "Cam Switch" drums were usually specific to...

    The "Cam Switch" drums were usually specific to each instrument they were used in. They had a special machine in the Engineering department to make them as needed. The contacts on the PCB are gold...
  18. My favorite is the guy who asks "what's it for ?".

    My favorite is the guy who asks "what's it for ?".
  19. The original Fender parts were made by Amphenol....

    The original Fender parts were made by Amphenol. I have an old 2005 Allied catalog that lists the 3 wire equivalent as made by WPI under the part number 160-2N. If you google WPI 160-2N there are...
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    Can you find the correct Mains plug to ship with...

    Can you find the correct Mains plug to ship with the amp ? Will the amp have an IEC inlet and the customer will supply a Mains cord set ?
  21. To build an amp from scratch you will need the...

    To build an amp from scratch you will need the following:

    A chassis. A pre-fabricated 'guitar amp chassis' will cost you. Other than that you can purchase a pre-fabricated box and drill holes in...
  22. The number 50 amp has lower plate resistors so...

    The number 50 amp has lower plate resistors so each side of the PI has lower gain. It needs more signal from the divider to balance the signal on the lower output tube.
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    Apparently the transformer has primary taps for...

    Apparently the transformer has primary taps for 100V, 120V, 220V and 240V.
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    What you are calling a bias adjustment doesn't...

    What you are calling a bias adjustment doesn't affect the bias of the output transistors, it has something to do with driver stage symmetry. No schematic shows the adjustment and there is no...
  25. Perhaps a picture would persuade you. Have you...

    Perhaps a picture would persuade you. Have you ever looked at how poorly a 12AX7 drives the tone stack in a 5F6A or Marshall 2203 ? It does OK until the signal gets really big. Then you start to see...
  26. The article has a factual basis, but it's...

    The article has a factual basis, but it's somewhat academic with no 'been there done that'. I don't think Rod plays guitar. What the article doesn't mention is that when you beef up the power supply...
  27. Is this the right schematic ? ...

    Is this the right schematic ?

    https://el34world.com/charts/Schematics/files/Gibson/Gibson_ga15rvt.pdf
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    There is a way one vendor could rate a...

    There is a way one vendor could rate a transformer at 300mA and another could rate the same transformer at 600mA. It has various names, Marketing, Specmanship, lying, fraud, you name it. The specs...
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