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  1. Replies
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    689

    Thanks! I checked the bias circuit and the...

    Thanks! I checked the bias circuit and the problem was the first resistor, it went bad and there was no bias voltage. I replaced it and all seems ok now.
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    689

    Bad redplating, PT Very hot!!

    Hi guys, I just had a very bad redplating problem with my plexi 50w clone, wich Has been running without any problems for some years now. Some days ago I replaced the power tubes with JJ EL34,...
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    2,365

    Well, so the DC coupled version is out of the...

    Well, so the DC coupled version is out of the question, I'll build it with the AC coupled cathodyne. Thanks!!
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    2,365

    Oh man! You're right!!! Sorry. Corrected now.

    Oh man! You're right!!! Sorry. Corrected now.
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    2,365

    Cathodyne PI: AC coupled vs DC coupled

    Hi! I'm building an Orange OR80 (2xEL34) inspired amp, it's basically the same circuit but with lower voltage PT and post PI MV.
    For those who aren't famiiar with the amp, here's an schematic for...
  6. Well, I found the problem, it was the lack of...

    Well, I found the problem, it was the lack of grounding, the outlets in my house don't have grounding, I use a cable attached to a bathroom pipe for grounding but it was disconected! Once I conected...
  7. With a regulated and isolated power supply, it...

    With a regulated and isolated power supply, it powers all my five pedals, except the RM that's powered with a battery.
  8. The hum only occurs when the RM is "on", not in...

    The hum only occurs when the RM is "on", not in bypass, even when there's nothing plugged in the input of the RM, so I don't think it's hum picked by the wah, otherwise it would hum no matter the RM...
  9. hum noise with rangemaster clone into a crybaby wah

    I was playing at home today with my rangemaster clone and my pedalboard, in wich the first pedal is a Crybaby gcb95, non true bypass the wah was off and was getting some hum that didnīt have when...
  10. Yeah, it was a productive day today! The amp...

    Yeah, it was a productive day today! The amp needed some cherishing after all the rehearsals and gigs.
    The tube was not microphonic, it made some popping noise when tapped and sometimes it started...
  11. After spending some time with the amp in my work...

    After spending some time with the amp in my work bench (living room table), I discovered that the second preamp tube was not the problem, it made some popping noise but I fixed it, it was a loose...
  12. I think I found the problem! It's something in...

    I think I found the problem! It's something in the second preamp tube socket, probably a cold solder joint, it makes some loud pops when I move the tube a little with my hand, it doesn't do it when I...
  13. I will try it, when the amp start squealing...

    I will try it, when the amp start squealing again, one of the most frustrating things is that the intermitent squeal appears for a couple of seconds and then it stops, most of the time the amp works...
  14. UPDATE: The squeal IS affected by the MV!! I...

    UPDATE: The squeal IS affected by the MV!! I though it didn't because when I turned it down to 0 it still squeled, but turning the volume up makes the squeal louder, wich is also strange, the volume...
  15. yes, the power tubes, since the squeal was not...

    yes, the power tubes, since the squeal was not affected by the MV settings, and the MV comes after the PI, I believe the problem is after the PI. I also tapped the preamp tubes without succes either.
  16. It doesn't sound like the tipical cell phone...

    It doesn't sound like the tipical cell phone noise, wich is frecuent if someone has a cell near the amp, this sounds like a cold solder joint-intermitent, but it's a squeal similar of the "reversed...
  17. Intermitent squeal not affected by MV settings

    Hi! I'm having some troubles with my JMP 50 clone the last days. I have used it for a couple of years (not exhasutive using) without problems, but 2 or 3 days ago, while playing at home it started to...
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    3,493

    Thanks Dave! Should I start experimenting with...

    Thanks Dave! Should I start experimenting with the Deluxe resistor values, or should I use different values as a starting point in the 18W?
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    3,493

    Adding NFB to an 18W

    I want to add a NFB loop to my modded 18 Watt clone, just the loop, not a presence control. I was wondering if this is correct:
    37899
    I've seen the Fender brown Deluxe schematic, it has a LTP PI...
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    1,088

    Now I get it olddawg! Maybe I expressed myself...

    Now I get it olddawg!
    Maybe I expressed myself wrong, I'm talking about the switch that connects a cap between the chassis and either of the mains line, like the old Fender tweeds, not the polarity...
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    1,088

    Yes, I always use power strips, and the ground...

    Yes, I always use power strips, and the ground lift adapter should be this:
    36848
    Never used one, and never seen one around here but it's the same thing as I do with a cable attached to the third...
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    Thanks! The main problem I have in most indoor...

    Thanks! The main problem I have in most indoor gigs, is that there's never a water pipe or something like that to make a ground conection near the stage, I can't have the wire running throu the...
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    Should I use a polarity switch?

    Hi folks, I'm seriously considering adding a polarity/ground switch to my amp, I live in Argentina, and sadly, 99% of the places we do gigs with my band donīt have earthed outlets. I always carry a...
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    Thanks guys! I'm making my own chassis, of...

    Thanks guys! I'm making my own chassis, of aluminum, so I have the freedom of choosing whatever layout I want, but I think I will make it with the traditional layout and using eyelet board, I'm...
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    1,528

    JTM45/Bassman true point to point layout

    Hi! I'm starting the build of a JTM45, this will be my third amp project, and I wanted to build it using point to point style, this means with no board with eyelets or turrets, just some terminal...
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    Thank guys! There's an old engineer here in...

    Thank guys!
    There's an old engineer here in Argentina who makes tube amps and speakers, and a former employee of a big speaker factory, he once said in a forum that it's impossible for a Greenback...
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    Whats the real power output of a 50W plexi?

    Hi!, I always wanted to know whats the real output power of a Marshall 1987 50 watt "plexi" at full volume. I'm gonna load a 2x12 cab I have with a pair of 25W Celestion Greenbacks, I always heard...
  28. I donīt have the specs right now but I can ask...

    I donīt have the specs right now but I can ask the manufacturer as soon as he aswers the mail I sent him yesterday asking for a new choke for this project. But anaway, I think I'll use it as is and...
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