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  1. Replies
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    Sooooo... What could be wrong with experimenting...

    Sooooo... What could be wrong with experimenting with something like a neo cap on an iron core!?! There's probably more than one way to skin any cat. The subtleties would probably make...
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    Oh I can't get one now. Any more than I can jump...

    Oh I can't get one now. Any more than I can jump to the moon. This is the slim season for painting and I'm about as broke as I get. I'm 51yo and I keep wondering when my life is going to settle into...
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    FWIW I built a little 2x6v6 amp from the guts of...

    FWIW I built a little 2x6v6 amp from the guts of a VOM phonograph. It sounded remarkably better than you might expect from the 300Vp and that tiny OT. It actually had a great low end and literally...
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    First, please post a schematic of the circuit you...

    First, please post a schematic of the circuit you propose.

    And B) I like a little more low end depth in my reverb. It sounds good. But it takes A LOT of fussing to make it work without acoustic...
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    That's lame. Why would they sell you the wrong...

    That's lame. Why would they sell you the wrong ones? Surely whomever is selling these knows that there's more than one option and one is discontinued? Easier to get paid if you don't mention it I...
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    I don't prefer to see a thread get off topic,.....

    I don't prefer to see a thread get off topic,.. But that's a lot of bang. I want one.
  7. Well the schematic provided for the thread below...

    Well the schematic provided for the thread below seems to be the same as the one posted here. Judging by the symptoms and what little discover has been made so far I REALLY suspect the trem circuit....
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    Alrighty... I modeled the amp in Spice, though I...

    Alrighty... I modeled the amp in Spice, though I used el84 power tubes because that's what I have right now in this program. On the up side el84's bias up and mu similar to 7591's so the results...
  9. Ah, yes. This ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ ...

    Ah, yes. This ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^

    I ignored for the moment that there may not be a reason to replace the existing diodes and just answered the question. So if you NEED to put in new...
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    What you have to do is set up a test. First tack...

    What you have to do is set up a test. First tack a capacitor to the ungrounded end of C4. Just one end of the cap. You'll be testing at the unconnected end. This cap can be any standard coupling cap...
  11. 1N4007 I'll go look at the "more power" post...

    1N4007

    I'll go look at the "more power" post and see if I have anything to add. The best answer will probably already be there. More efficient speakers.
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    Here's a discussion where Randall Aiken responds...

    Here's a discussion where Randall Aiken responds to the matter. Apparently someone took something he wrote out of context and that may be how this rumor got started. But in a nutshell, no. Fast...
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    And it's important to note that aren't NEVER off...

    And it's important to note that aren't NEVER off center or ALWAYS uniform. Really, how large a control sample for consistency are we dealing with here?

    If you examine the grainy nature of most...
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    Hey! At the very least this thread detected a...

    Hey! At the very least this thread detected a gross error in this models layout diagram. And that could help someone in the future :thumbsup:
  15. I'm confused. There was no 1k resistor that I...

    I'm confused. There was no 1k resistor that I changed. The 1k resistor to the screen supply remains as it was (though I might be inclined to up it's value to 2.2k.?.). I ADDED the 150 ohm resistor...
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    I was thinking the same thing. We tend to see...

    I was thinking the same thing. We tend to see similarities in design with the same maker so I went looking generally for Eden power supply schematics. Alas, I didn't find one with a reasonable...
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    This is what I've always done. I read here about...

    This is what I've always done. I read here about the parallel cap thing sometimes and I always wondered if I just didn't "get it". Like I didn't know enough to see the merits or something. Twice I've...
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    Yes, that is what I meant. I was using a...

    Yes, that is what I meant. I was using a hypothetical "ideal" cap as model for the discussion. In which case what I meant by "too much of a parallel resistance" is too much conductivity. I edited my...
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    Most often the failure mode in power supply...

    Most often the failure mode in power supply electrolytics is such that tacking a good cap across a bad cap can restore performance and this actually has been discussed here a lot. Though you're not...
  20. Ok, here's what I have for a "guitar amp"...

    Ok, here's what I have for a "guitar amp" improvement for this amp.

    The changes may not be what you expected, but since this amp will likely be overdriven a lot and the power tubes are at a high...
  21. And how much gain? Genre? Blues/rock, hard rock,...

    And how much gain? Genre? Blues/rock, hard rock, metal? Gritty or saturated?
  22. OOOooh... Ok. I'll try to be minimalist about it,...

    OOOooh... Ok. I'll try to be minimalist about it, but challenge accepted ;) There's only so much LTSpice can tell me, but I do have a good bit of real world experience with this power tube.

    First...
  23. IMHO you may as well just replace it with a 1M...

    IMHO you may as well just replace it with a 1M resistor. I don't think there's any tonal advantage to turning it down at that second volume control.

    Hopefully you didn't already drill an extra...
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    Service temperature 82°C/180°F Meh. Probably...

    Service temperature 82°C/180°F

    Meh. Probably alright. I'd be inclined to go with a higher temp product. No beer for that choice. But you can keep the others ;)
  25. In the recording you can hear there is no snap as...

    In the recording you can hear there is no snap as the noise fades (relatively slowly too) and the background room ambiance is still audible. I believe the poster stopped the noise at the end of that...
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    For my small experience a plate to heater short...

    For my small experience a plate to heater short is usually caused by a bad tube. But it's hard to say what will happen in a tube if it's stressed and overheated. A short in a power tube is usually an...
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    While I think g1 is right about the screen...

    While I think g1 is right about the screen filter, I have seen high value screens before in bass amps. Granted, they weren't typically overdriven, but I still have to go with the possibilities of:
    ...
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    Reading your first post my immediate thought was...

    Reading your first post my immediate thought was "If the ribbon cables were that bad then the board connection for them is probably damaged as well". And of course that's what you found by post #4.
    ...
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