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    You could create a mid boost, as it were, by...

    You could create a mid boost, as it were, by cutting mids and designing up some filters to just let bass and/or treble pass.
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    Cheers for your reply olddawg, did I mention I'm...

    Cheers for your reply olddawg, did I mention I'm in New Zealand? I guess not. Straight off I've realised I got confused between the ecf82 and the ecl82, and that's possibly why this amp took my fancy...
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    There seems to be a mistake in there, All looks...

    There seems to be a mistake in there, All looks kinda right except the output of the of the middle one feeds back into it's timing input? What? Hows that going to work? Methinks that's a mistake as...
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    Funny how we end up answering our own questions....

    Funny how we end up answering our own questions. Remembered I got a short spring reverb from accutronics ages and ages ago and built me a reverb. I'd ordered high impedance inputs on it, 1475 ohms,...
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    Done a little research and the reverb driver on...

    Done a little research and the reverb driver on the deluxe reverbs is 25k/8ohms so I'd be somewhat off using an 8k/10k small output unless it had a 4 ohm secondary otherwise, and I've lots of those...
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    Vox ac10 from old radio.

    Howdy Chaps, For starters it's been a very long time since I've been near forums like this. I think it was maybe 2006, so twelve years ago, I kinda gave up and moved onto other things.
    Umm,...
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    Fisher 400 amp V2

    I just got given one of these tonight and am in the process of figuring out what to do with it. I don't really listen to music so much anymore, and if I did I've got a lovly old phillips SE stereo...
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    Have you checked the power supply reistors for...

    Have you checked the power supply reistors for the preamp tubes? and if you have are they as the schematic specifies? It's the job of those resistors to drop current and voltage from the higher...
  9. Thread: reforming caps.

    by sean k
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    Thanks Steve, #1, at the...

    Thanks Steve,
    #1, at the time, which was many years ago, I didn't know that old caps were a stupid idea and basically they were the only ones available... but now I know better,...
  10. Thread: reforming caps.

    by sean k
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    Well they're not particularly old, NOS from a...

    Well they're not particularly old, NOS from a surplus shop, or maybe they are but they're not used except for when I power up the amp and remember it's completely noisy.

    It's not so easy to...
  11. Thread: reforming caps.

    by sean k
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    1,598

    reforming caps.

    I never really took any notice of old caps when I built my first amps and theres two that hum like banshees. The other thats actually usable has a choke and that may be the reason its reasonably...
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    Well, I don't want a T- shirt or a CD... given...

    Well, I don't want a T- shirt or a CD... given the idea I give you is even useful but with this kind of stuff it helps a little if you divide off the bass from the mids and the highs and theres...
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    Well, either outside the house or something in...

    Well, either outside the house or something in it. I told my story because it was a time when something outside my system was wrong but I thought it was something in my system.

    In a sense it has...
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    27V's fine but whats your current capability....

    27V's fine but whats your current capability. Each 9V should be at least 300mA but it's not a great thing to have them in series as the seconds pulling it's own current plus the current from the...
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    I had a problem at a gig a while back that...

    I had a problem at a gig a while back that perplexed me and the problem was that my Boss power supply is a switchmode and wouldn't function because I was on a power circuit used for lights with a...
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    If you look at the charts for power diss versus...

    If you look at the charts for power diss versus output you'll see that for a 6W output youve got about 5W dissapation which means you need to supply 11W at least( for 8 ohms and 28V supply). Rule of...
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    Well, I think you may have a malfunctioning power...

    Well, I think you may have a malfunctioning power supply capacitor somewhere in there that, once it heats up, is unable to hold a charge.

    Are the clean channels digitally processed or are they...
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    More reverb on the marshall reflector

    Howdy Friends,
    I've got a few reverb tanks and one tubed pan almost ready to go but I'm gigging heaps these days and don't have as much time for soldering as I used to so...
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    Just as an aside, those things can get pretty...

    Just as an aside, those things can get pretty pricey and often you can find LDR's (Light dependant resistors) by themselves and add an LED and file off the top of the LED and glue it to the LDR with...
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    Nope, sorry Bud, don't do the recording stuff at...

    Nope, sorry Bud, don't do the recording stuff at the mo'

    Though if it's really loud you might hear it in Wellington!
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    When the rest of the world works at 6 degrees of...

    When the rest of the world works at 6 degrees of separation we have a new company called 2 degrees... the idea being that we're so small and relatively modern that we have everybody, almost, but not...
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    It's just that the power transormer I'm going to...

    It's just that the power transormer I'm going to use hasn't got filament windings so it's a matter of finding the relevant filament transformer to suit whatever I decide to do and 6.3V transformer of...
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    Hey Otto, I did do some work with Neil years and...

    Hey Otto, I did do some work with Neil years and years ago but our paths have not crossed for a very long time though I did have the pleasure of jamming with Paul Crowther, the ol' split enz drummer,...
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    Good Golly, that is such the right circuit to...

    Good Golly, that is such the right circuit to show me, Rock on in Heaven Fred!

    Not only will the 6H6 be a close enough substitute for the 6AL5 but the 6F5 will likely be able to take the place of...
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    http://i4.photobucket.com/albums/y115/quickkiwi/bl...

    http://i4.photobucket.com/albums/y115/quickkiwi/blogtown/tbampfini.jpg
    All finished... just got to get around to firing it up... I so enjoy building these things... not so interested in using...
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    6K7 rf remote cutoff pentode

    I just dig the idea of using one of these metal can tubes with the grid on the top cap so the signal can go straight from the input, through a resistor to the tube.

    So whats going to happen to a...
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    http://i4.photobucket.com/albums/y115/quickkiwi/bl...

    http://i4.photobucket.com/albums/y115/quickkiwi/blogtown/tbampdet01.jpg
    The power supplies, OT and most of output tube, filaments and grounds that sit underneath the board....
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    Chuck, the board is copper clad and I'll be...

    Chuck, the board is copper clad and I'll be etching it to solder the caps and resistors to. Normally upside down I suppose but I want to be able to track things easy, take voltages and change out...
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