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  1. Thanks Enzo.... I am looking at the physical...

    Thanks Enzo.... I am looking at the physical connections carefully. Will report back.
  2. Thanks again Leo... I will look at those...

    Thanks again Leo...

    I will look at those components.

    The DC Blocking Cap measured 2190uf and ESR = .09 ohms.

    I pulled each of the power transistors. They appear to be ok. The HFE ranged...
  3. Thanks Leo.... As per your suggestion, I...

    Thanks Leo....

    As per your suggestion, I tacked on a 1000uf across the existing 2000uf cap - no change. I will pull the 2000uf to check it outside the circuit.
  4. Acoustic Control 450 Base Amp - Check Up / Tune Up Low Output

    MEF Members….

    A friend asked me to perform a checkup of an Acoustic Control 450 Amp Head. When first turned on, I could tell the pots were dirty and needed cleaning. After doing that and cleaning...
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    What comes after the "L"? Is that a 2? What...

    What comes after the "L"? Is that a 2? What else?
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    This one is for the Dawg.... A friend had...

    This one is for the Dawg....

    A friend had serious neck and shoulder pain. I bought one of those Home Depot elastic support waste bands, cut off the shoulder straps, took out the metal support...
  7. Bob.... See thread 18428...

    Bob....

    See thread 18428. That thread is titled "tube/speaker magnet proximity." I found another thread on tdpri.com - Speaker magnet proximity to tubes. Perhaps these two threads might shed...
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    Gary.... It is doubtful that you will find a...

    Gary....

    It is doubtful that you will find a direct replacement part - unless it comes from a donor amp.

    Take a look at thread 26671.

    Also, see thread 41801. That one shows a home made...
  9. KMS: I found a video where a guy is repairing...

    KMS:

    I found a video where a guy is repairing the Crate 3 Button Footswitch. Take a look - Crate Service, Repair, and Demo. Watch the first 10 minutes.
  10. Hi Bob.... Lots of posts on different threads...

    Hi Bob....

    Lots of posts on different threads regarding tube distance. Just do a search for "minimum distance power tubes."

    Here is one such thread - EL34world.
  11. I believe this amp uses the CFS3 (3 button)...

    I believe this amp uses the CFS3 (3 button) footswitch. It needs a 9v battery. Not sure if the battery does anything beyond powering the LEDs.

    KMS: If G1's theory is correct, how about we...
  12. Schematic and Board Layout Attached. As I...

    Schematic and Board Layout Attached.

    As I mentioned in the other thread (non abandoned), take a look at page 3 of the schematic. It shows you points A, B, and C. Tell us if you get these...
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    KMS: You might consider starting a new thread...

    KMS:

    You might consider starting a new thread instead of resurrecting an old one. And please repost the schematic and board layout.

    Did you take a look at page 3 of the schematic? It shows...
  14. GM: Not sure if this is the correct schematic...

    GM:

    Not sure if this is the correct schematic for your amp - VS100R-100W-Schematic.

    Does your amp have either molex connectors or ribbon cables? Maybe one of the wires came loose? Do a...
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    Schematic Posted...

    Schematic Posted...
  16. Here it is.... a final stab at the full schematic...

    Here it is.... a final stab at the full schematic for the LJM L15D Version 2 Amplifier. I was able to scrunch in Nick's output protection diagram in the upper right. I crossed out resistor and cap...
  17. Thread: PT questions

    by TomCarlos
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    Great. If the PT has a part number on it, can...

    Great. If the PT has a part number on it, can you post it here? That info could be helpful to others.
  18. Thread: PT questions

    by TomCarlos
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    The PT might have come from the Bugera Vintage 55...

    The PT might have come from the Bugera Vintage 55?
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    Thank you G1 - I went back into that post and...

    Thank you G1 - I went back into that post and fixed my errors.
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    MEF Members (and future visitors): I want to...

    MEF Members (and future visitors):

    I want to close the loop on a couple items discussed in this thread.

    First, the bias of the 6L6s. I rigged up a temp circuit as suggested by Enzo. It worked,...
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    I like that design!! Much simpler than what I...

    I like that design!! Much simpler than what I came up with. A dado cut in the base would help strengthen the upright support legs.
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    Perhaps you can study the Seymour Duncan SH-4 JB...

    Perhaps you can study the Seymour Duncan SH-4 JB Model Slant Humbucker Pickup as an example?
  23. And my guess is that someone made that tube...

    And my guess is that someone made that tube chart... Compare it to those you find on the net.
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    I had a similar problem with a Peavey Scorpion...

    I had a similar problem with a Peavey Scorpion Speaker. The foam disintegrated after 30 years. Thankfully, I had a microphone windshield foam cover that I was able to cut up and use.
  25. Ken... If all else fails, you can open the pot...

    Ken...

    If all else fails, you can open the pot and try to repair it.

    How Do Potentiometers Work And How To Service Them. Cleaning Volume Controls
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    Thanks Enzo... Earlier, I found an old thread...

    Thanks Enzo...

    Earlier, I found an old thread from 2010 titled "Not Enough Bias Voltage?" In that thread, you offered advice on the Bias circuit for the Peavey Butcher amp. The bias circuit in...
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    I apparently wrote my notes backwards! So it...

    I apparently wrote my notes backwards! So it should go like this...

    The more negative the Control Grid voltage, the lower the plate current.
    If you make the CG voltage less negative, that will...
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    And a shout out to Enzo who did mention "DC...

    And a shout out to Enzo who did mention "DC Resistance of the winding" in #19. I didn't connect the dots on that. So thank you.

    Last topic on this amp, I wanted to post some notes on the Bias...
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