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  1. Replies
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    Sticky: What? Nobody uses https://www.angela.com/ ?

    What? Nobody uses
    https://www.angela.com/
    ?
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    You rocket scientists all think alike :p

    You rocket scientists all think alike :p
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    Right! I guess my question was an awkward way of...

    Right! I guess my question was an awkward way of asking how to NOT worry about that thermal fuse. I know the line fuse is to protect the venue, not the equipment; like a lot of us, I'd like to think...
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    Is there a way to guesstimate, based on the VA...

    Is there a way to guesstimate, based on the VA rating of the PT, what may be safe to prevent the PT's thermal fuse from blowing? I'm thinking something like
    fuse rating = VA/nominal line voltage *...
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    Whoa. Sorry to hear that. Care to elaborate?

    Whoa. Sorry to hear that. Care to elaborate?
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    +1. Removing the death cap provides a hole in...

    +1. Removing the death cap provides a hole in just the right spot to jump the screens. And the switch can be re-purposed, so no parts to buy!
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    I think mentioning CERN instead of cheese would...

    I think mentioning CERN instead of cheese would have been more in line with offering 'tech cred' about the guitar :p

    edit: yes, interesting video. Fun!
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    Right! I agree with your assessment. I'm only...

    Right! I agree with your assessment. I'm only trying to pick nits here.

    The sound has a smoldering intensity, very controlled and 'proper British'. I think it has to do with the execution of the...
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    I can see a confusion arising by mixing up...

    I can see a confusion arising by mixing up 'clean' tone and 'pristine' tone. (As Frus mentioned Pink Floyd) David Gilmour has a habit of really overdriving his guitar but not letting it get fizzy....
  10. The shared cathode resistor helps reduce cathode...

    The shared cathode resistor helps reduce cathode degeneration from the lack of a cathode bypass cap. If you split the resistors, it'll have an impact on the gain of the power tubes if you don't then...
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    Of course. But while we're optimizing the power...

    Of course. But while we're optimizing the power stage, we might want to know what we're optimizing it for. (sorry about the bad grammar)
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    While I'm reading this discussion, I'm wondering...

    While I'm reading this discussion, I'm wondering if the application calls for loudest, cleanest power (near 100% idle dissipation, lower Zpri) or some potentially gratifying distortion at 'home'...
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    Based on my playing around with NickB's...

    Based on my playing around with NickB's calculator (5 minutes tops, no way "due diligence") I found myself looking at about 200R cathode resistor and a 5k or 6k OT (probably a champ OT would be close...
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    Welcome back! I figured you had blasted yourself...

    Welcome back! I figured you had blasted yourself into the future with no way to return...

    I use NickB's calculator here: bmamps.com
  15. In my vast experience (I've done TWO cabinets :p)...

    In my vast experience (I've done TWO cabinets :p) I used a chalk line for the long cuts. Probably because I'm really bad with straight lines! I probably did use sharpie for outlining the glue areas....
  16. How big was the filter node that you bypassed for...

    How big was the filter node that you bypassed for the change? On a SE amp, power supply hum is always a problem and the screen node may have been filtered more than just a bit? Can you post a...
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    I'm sure the answer is either 'yes' or 'no',...

    I'm sure the answer is either 'yes' or 'no', depending on the circumstances.

    My only experience with recovering a cab required me to scrape, chip, and sand - because the remaining glue from the...
  18. Have you tried a value other than 820R in that...

    Have you tried a value other than 820R in that NFB loop?
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    aaand we're back, essentially, to post #6. A...

    aaand we're back, essentially, to post #6. A simple single transistor buffer.
  20. A fuse blown suggests that there is an actual...

    A fuse blown suggests that there is an actual problem that needs to be fixed. having said that...

    I have the 60W (mono) version of that amp, and one issue I did run into with it was after using...
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    What's the drop across the resistor alone? Less...

    What's the drop across the resistor alone? Less than the total 30v, I'll wager.
  22. Thanks for that. I had to refer to the drawing...

    Thanks for that. I had to refer to the drawing (post #13) so see where everything went.

    :offtopic: I'm a little confused why the 'ground' lug of the MV goes to the 100R node and not directly to...
  23. OK. I was instructing TelRay to measure the...

    OK. I was instructing TelRay to measure the voltage at the 100R node, Not the grid.
  24. Yes, you are right. While the loop is open.

    Yes, you are right. While the loop is open.
  25. I don't think the signal will appear flipped, but...

    I don't think the signal will appear flipped, but the out-of-phase signal through the NFB loop makes the original, in-phase, signal smaller by subtracting a little of that signal.
    You should be able...
  26. I know RG knows this, but HB may not: In the...

    I know RG knows this, but HB may not:
    In the golden age, electrolytic caps were often spec'd with a uF value +80%/-30%. The engineers who spec'd the rectifier tubes, then, could not be sure that any...
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    http://bmamps.com/ivds.html using this online...

    http://bmamps.com/ivds.html

    using this online calculator, I'm getting just under 2W audio power, and about 6W dissipation. As Alex suggested. Is there a reason that you are limited to a B+ of...
  28. just to verify: You did test the 100R node to...

    just to verify:
    You did test the 100R node to ground and measured 100R with your meter? Actually, with the 820R lifted it will measure 100R. With the 820R in circuit it should read about 90R. If you...
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