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  1. Replies
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    I'm curious too. Actually, curious TWO: 1)...

    I'm curious too. Actually, curious TWO:
    1) first, why lower the bias resistors? Most folks are trying to UP their values.
    2) why won't the source impedance affect the knee frequency of the network?
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    I think yes, you will double the current and...

    I think yes, you will double the current and halve the source impedance.
    You'll still have the peak-peak voltage limits of a cathodyne though. Approx 1/3 HT for the signal reaching the grids of the...
  3. That was my first thought, but they do say they...

    That was my first thought, but they do say they installed fresh batteries.

    I wonder if a comparison has been made between playing the active pickups turned down to not distort and playing a guitar...
  4. Does changing the amp's physical location make a...

    Does changing the amp's physical location make a difference? For instance, rotating it 90 degrees (if it's facing south, turn it east). Or moving it across the room or into a different room. If it's...
  5. I just revisited this discussion, yes I know, 1...

    I just revisited this discussion, yes I know, 1 1/2years later. :tape:

    Mike, how does the amp feel after this time? Are you still wanting more gain (distortion) out of the extra stage? Have you...
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    I'm not a pickup maker/winder, so please excuse...

    I'm not a pickup maker/winder, so please excuse my total ignorance. When I swap pickups out of a guitar, I'll toss the ones removed randomly into a drawer. From the looks of it, I'm at risk of...
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    OK, I came here for the bikinis. Where are the...

    OK, I came here for the bikinis. Where are the bikinis? :( :p
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    I'm not a winder but I'm curious. By 'efficient'...

    I'm not a winder but I'm curious. By 'efficient' you mean very little to no scatter?
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    Peter hasn't been by this way for almost 3 years....

    Peter hasn't been by this way for almost 3 years. Maybe some one else will help? It might be a good idea to start a new thread since this one has been dormant for so long.
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    I've done two things with it: found the...

    I've done two things with it:
    found the resistor, capacitor, diode and xfrmr (etc) graphics that I'd use, drop them into a "template" project.
    drew my own tube graphics.

    from there I don't need...
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    If you're not getting continuity between chassis...

    If you're not getting continuity between chassis and the green 'ground' wire, then that's an issue to fix. Is it possible that the points you chose to test on the chassis were painted, or coated with...
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    If the PE wire doesn't go straight to chassis via...

    If the PE wire doesn't go straight to chassis via a reliable connection (such as a dedicated bolt) it really aughta. To meet modern code and make the shortest, highest-current-carrying path to ground...
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    Thanks for the clip! Really iconic crunch! ...

    Thanks for the clip! Really iconic crunch!



    I'm not sure if I understand this? First, there should be a 3-wire grounded cable to the amp. the ground wire must go from the line cord to the...
  14. I'm surprised no one has suggested skipping any...

    I'm surprised no one has suggested skipping any and all controls completely in the amp. If the desire to to get the hottest, boldest sound out of the pickup, there's no substitute for a single wire,...
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    For anyone who cares: I installed a Gauss-meter...

    For anyone who cares: I installed a Gauss-meter app on my phone and went about checking Gauss levels on some pickups. All I can say is DON'T DO IT! I destroyed the detector in the phone, could never...
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    Very good points, Helmholtz, thanks for keeping...

    Very good points, Helmholtz, thanks for keeping me honest!



    The 'bump' test requires a ballistic meter movement to clearly see what's going on.




    I should have mentioned I use a small...
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    as an aside: tapping the pickup with a...

    as an aside: tapping the pickup with a screwdriver is a way to test the electrical polarity of the pickup. That, and a magnet to test the magnetic polarity is used to identify and wire up unknown...
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    Yes, really strange getting use to how the teflon...

    Yes, really strange getting use to how the teflon coating differs from what I'd always seen before.

    For the last couple builds, I've been buying the Tefzel wire by the foot. A couple feet of red,...
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    I sense a niche market here :p

    I sense a niche market here :p
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    And regardless of what's done as restoration,...

    And regardless of what's done as restoration, take enough hi-def pics when you receive it to ensure that you can show off its 'original vintage-ness'. I don't expect you to crack open the chassis...
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    I had to look twice, and then a third time time...

    I had to look twice, and then a third time time before I realized the amp is sitting on a card table. The angles and lines led my eyes to believe it was a huge cab resting on the floor and towering...
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    I would think, semantically, that if the added...

    I would think, semantically, that if the added wire is the 'pigtail', then the splice used to join the pigtail to the rest of the wire would be the 'pigtail splice'.
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    Well, I learned something new today. I always...

    Well, I learned something new today. I always called it "twisting two wires together" ;)



    edit: but upon reflection, I can well imagine back in the telegraph days there needed to be a standard...
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    most of your brightness is due to the .002u cap...

    most of your brightness is due to the .002u cap that parallels the 470k resistor in the schem you show. Marshall makes that 470p, about 1/4 the value of your amp's cap. The 470p 'bright' cap (the one...
  25. This ^^^^^ please note that I've found the...

    This ^^^^^

    please note that I've found the hard way that Seymour Duncan and DeMarzio have different color codes that made it somewhat confusing when I had the two in hand. Double check!
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    +1 on that. If you are looking for the amp to...

    +1 on that. If you are looking for the amp to speak its character then set the volume full on the amp, use the vol on the guitar to find the level or 'sweet spot' you're looking for.
    One additional...
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    I'd spray/scrub the coverings with Lysol before...

    I'd spray/scrub the coverings with Lysol before the 3-day quarantine. And yes, I have heard the virus is viable a few hours to a few days for most surfaces. Softer, more protective substrate gives it...
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    Quite the windup for your pitch, there, Chuck! :p

    Quite the windup for your pitch, there, Chuck! :p
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