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  1. Thread: Strange find.

    by Chuck H
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    12
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    244

    Great player. Really knows how to get the best...

    Great player. Really knows how to get the best out of an amp. That said... I think he could have made any amp sound good. The tone of the amp itself didn't excite me much. It's good. Not great. But...
  2. Thread: Strange find.

    by Chuck H
    Replies
    12
    Views
    244

    I thought the same thing. You could use ANY amp...

    I thought the same thing. You could use ANY amp for that. Well, any amp that will reproduce the effected tone. The amp itself has very little to do with the "tone" he's using. Still, I do enjoy...
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    511

    Do you mean to say that adjusting the presence...

    Do you mean to say that adjusting the presence control is changing the plate voltage?
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    511

    I think you meant "touching the grids".?. This...

    I think you meant "touching the grids".?. This sounds like a probability, but I've never seen it. I'm interested to hear if this is what's happening because it seems like a rare problem and an...
  5. Really good to see you Tom. Everyone has missed...

    Really good to see you Tom.
    Everyone has missed your participation.
    And you could return if it was the troll issue that put you you off, so...
    Don't be a stranger.
    Even if you have issues with...
  6. Replies
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    It's very hard to follow the filter cap wiring...

    It's very hard to follow the filter cap wiring from photo's. That or I lack the patience ;) I did briefly compare to other photos of 1959's (including another SLPs) that I could find here and there....
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    If it helps, I put one on each foot. works every...

    If it helps, I put one on each foot. works every time.
  8. Replies
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    589

    Indeed! Short of hacking into a crowded and...

    Indeed! Short of hacking into a crowded and complicated build topology it seems that the output is at least a convenient place to tap in. Plus there's the convenience of the outputs low impedance...
  9. Replies
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    771

    There might be a language barrier responsible...

    There might be a language barrier responsible here.?. But says who? Certainly they CAN be, but I think they're usually not. At least not in my world. Even most "kit" amps often have parts developed...
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    7591's

    7591's
  11. Replies
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    272

    Tung oil, Tru oil, Danish oil, Teak oil, etc. all...

    Tung oil, Tru oil, Danish oil, Teak oil, etc. all have an amber tint to them. They also amber more with a little age. I wouldn't worry about the color.

    Use any oil finish you like. In my...
  12. Replies
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    771

    What rectifier? What is the unloaded voltage with...

    What rectifier? What is the unloaded voltage with that rectifier? And what is your bias current? Please? I'm concerned that you have a pair of 40W tubes in there and the HV is loaded down 130V from...
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    If you were being careful not to over do it, as...

    If you were being careful not to over do it, as stated, then you probably still have lee way to sand out the discoloration. It won't be very deep. After that you can apply anything you want to...
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    7591's

    7591's
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    771

    Yepper. I just looked into the probability of...

    Yepper. I just looked into the probability of acquisition and discovered my faux pas (pinky out ;)). The good news is that JJ is making a 7591 that is said to have the same voltage rating as the...
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    771

    I just had a moment of clarity... For a primary...

    I just had a moment of clarity... For a primary impedance typical for el34 tubes you could use a pair of el37 tubes. I think they'll take the voltage and reduce the current requirements. I've never...
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    From post #6

    From post #6
  18. Replies
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    589

    And as you can see, the line out is wired with...

    And as you can see, the line out is wired with the standard series resistance and a dropper to 0V. The circuits already suggested will work like this. If the negative speaker terminal isn't at 0V...
  19. Replies
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    771

    Like mozz I did a little digging to find what the...

    Like mozz I did a little digging to find what the 54-13 was used for. Typically mono block type amps that are never intended to be clipped. Also, the rectifier of choice seems to be the 5R4 as Justin...
  20. Replies
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    771

    Your right. I didn't check that. So that would...

    Your right. I didn't check that.

    So that would be 4.2A on the 4A rated filament winding with el34's. Which is probably alright.?. A little light. As is the 134mA rating on the HV winding. Which is...
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    Ok... Since the amp is wired with pins 1 and 8...

    Ok... Since the amp is wired with pins 1 and 8 connected, has the ubiquitous 1k screen grid resistors and the loaded plate voltage will likely be somewhere around 500V I'd say the builder intended...
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    At 566V unloaded there's no way that's for a pair...

    At 566V unloaded there's no way that's for a pair of small bottles. So, that 5y3 rectifier is unsuitable. I don't know how much spec you can decipher from the power transformer, but if it "looks"...
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    re: the 15k or 10k series resistor value with a...

    re: the 15k or 10k series resistor value with a 470 ohm dropper,..

    With the 22k/1k values being discussed there was already a concession being made toward the low ratio side. For a 100W amp the...
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    589

    Consider that the load from the line out voltage...

    Consider that the load from the line out voltage divider will be at 23,000 ohms. If you divide that by 8 ohms you get 2875. So 1:2875th of the wattage will be across those resistors. If the guy is...
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    I figured we were ok with your circumstances sir....

    I figured we were ok with your circumstances sir. This is just the sideline discussion at this point. It happens.
  26. STOP!!!! I think we've already covered this in...

    STOP!!!!

    I think we've already covered this in this thread somewhere, but a quick run through didn't reveal it. So...

    There's an easier way to tell if your OT is in incorrect phase. All you...
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    Wait... What? How is the bias resistor value...

    Wait... What? How is the bias resistor value "extremely irrelevant"? And the statement "not in the signal path" is also misleading. For all intents and purposes this is primarily a load resistor. So...
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    The older JC was never loved for it's distortion...

    The older JC was never loved for it's distortion circuit. But Roland has some newer distortion circuits that I thought were very good. I don't know how similar the topology might be between the old...
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