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  1. What concerns me about a single fuse in the CT,...

    What concerns me about a single fuse in the CT, is the fuse will only offer protection if a fault occurs in the rectified circuit, or if a leg of the secondary shorts to ground.
    If there is a fault...
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    I set up a workable prototype board to wire this...

    I set up a workable prototype board to wire this up, but got distracted by a project within the project and lost focus.
    I was going to build myself a Wein Bridge oscillator, because the Velleman...
  3. I’m starting to see the wisdom in encouraging...

    I’m starting to see the wisdom in encouraging customers to get whatever set of replacement tubes they prefer, and telling them we’ll take of the rest.
  4. Tung Sol 6V6 (New Sensor) high failure rate recently

    Over the last few months, we've been experiencing a high rate of failure in new production New Sensor's Tung Sol brand 6V6s. The first occurrence happened in a batch we bought a few months ago, and...
  5. I always felt the same way about the Crate V30....

    I always felt the same way about the Crate V30. Had an awesome clean sound, with headroom for days. But the distortion channel was unusable.

    I've worked on soooo many of Blues/Hotrod amps, I can't...
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    Newark was acquired by Avenet recently, but It...

    Newark was acquired by Avenet recently, but It looks they still are partnered with Farnell for inventory and distribution for now.
    47-720pF @ 630V is pretty sweet. I could use those all day
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    I love polystyrene capacitors. Unfortunately,...

    I love polystyrene capacitors. Unfortunately, they have 3 main disadvantages. First, like you mentioned, they can be damaged at relatively low heat. Second, they are often terminated with very light...
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    Right. I've been thinking about the difference...

    Right. I've been thinking about the difference between increasing the input impedance by bootstrapping the circuit we've been discussing above and the degenerative "grid feedback" as it is drawn....
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    This makes sense, since when operating like this,...

    This makes sense, since when operating like this, it's essentially running like an unbalanced cathodyne phase inverter. I would think just under 2/3rd (or so) of the voltage at the plate is dropped...
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    I signed up on diyAudio, but I can't download...

    I signed up on diyAudio, but I can't download attachments yet. Could you post the 6111 model here, Dave? (unless it was written out as txt in a post?)
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    I may have made a mistake in the tail...

    I may have made a mistake in the tail resistor/biasing resistor when I drew up the load line. I may not have accounted for twice the bias current from both tubes! lemme go back and double check.
    ...
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    The guitar player in the last band I ran sound...

    The guitar player in the last band I ran sound for recently used a wireless setup. The particular unit he used was pretty noisy on this night. But, I've used some wireless systems in playing a couple...
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    Excellent! I was wondering if you were going to...

    Excellent! I was wondering if you were going to make these available. I thought I remembered reading that they were only available to UK buyers on bmamps once upon a time.
    I just saved your reverb...
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    I was looking into a couple of different boost...

    I was looking into a couple of different boost converters for a recent project. One of my concerns was isolation in the supply (as it would essentially be an inline effects unit). The size and cost...
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    I remember years ago, when I first became a...

    I remember years ago, when I first became a member I think, someone posted a really tragic account of a musician who suffered a severe shock during an outdoor show.

    edit* I think it might have...
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    The 6111 is a high gm tube, and I would take a...

    The 6111 is a high gm tube, and I would take a quick calculation of the cathode follower Zout to be ≈200Ω or so. I could get a better estimate by looking at the rp and gm in the datasheet for these...
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    If you test an outlet and it shows any incorrect...

    If you test an outlet and it shows any incorrect wiring, do NOT use that outlet. Particularly if there is an open "ground" or if the polarity is reversed. This is especially cogent is situations...
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    Good friend once told me, “If you’re not...

    Good friend once told me,
    “If you’re not loosing customers, you’re not charging enough money”.
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    Just thinking aloud here;...about the impedance...

    Just thinking aloud here;...about the impedance at the plate, per my last post.
    In the second schematic, the second triode is a kind of grounded grid stage. But the grid voltage follows the cathode...
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    Interesting. This circuit was only an...

    Interesting. This circuit was only an experimental exercise for the most part. I'm trying to better understand how bootstrapping works, and see how the concept can be expanded. I'm not sure the...
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    How did the non-steady state operation of class...

    How did the non-steady state operation of class AB factor into your choice of boost converter?
  22. No worries, Tim. it's a little slower going...

    No worries, Tim. it's a little slower going trying to learn something this way, so I appreciate the help.



    I disconnected all the compensating components, as well as the MOVs.
    Here is a...
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    Right, I understand the principle when applied to...

    Right, I understand the principle when applied to a traditional grounded cathode/emitter stage. Would the cathode impedance remain the same in this configuration?:
    54333

    This is similar to what...
  24. okay, there's only so many times I can get the...

    okay, there's only so many times I can get the same results before I have to admit I'm in denial and the bandwidth and phase response of my amplifier is total shit.
    Using my venerable 465, I got a...
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    Oh yeah, I sometimes forget that the seasons are...

    Oh yeah, I sometimes forget that the seasons are opposite us down where the water circles the drain the wrong way
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    ^^^^^ exactly right. The audible symptoms are...

    ^^^^^ exactly right. The audible symptoms are usually very low output volume and heavily distorted. Swap them out with some pulls and see if it fixes it. If so, then one of your tubes is shite.
    If...
  27. I knew it was the regulators ;)

    I knew it was the regulators ;)
  28. Right. That's how I've been trying to check the...

    Right. That's how I've been trying to check the phase shift. But I've never done it before. So when I get results I'm not expecting, it makes me question whether or not I'm doing it correctly.
    I've...
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