Thursday 5 December 2019

Holmes H-X6 Spectrum

A rare and versitale old 3-band eq pedal with High Pass, Band Pass and Resonance controls. Schematic is avaiable at DeadendFx


16 comments:

  1. Shit...gotta build this too. Nice!

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  2. This is verified with a caveat. All controls are working as they should but there are settings where the signal is cut off at extreme ends of the mid and bass pot's rotation. It seems to matter how the resonance pot is set and depending on that the eq controls may or may not cut sound at certain settings. I went over it a few times and don't see any issues. I wonder if the original does the same thing. I'll keep looking at mine and see if any mistakes become apparent. Even with the strange behavior, this is a really cool pedal to put after fuzzes to get some different sounds from em.

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  3. wow, thanks giving it a try!. I'll compare the layout once again to the schematic to see if I spot something odd during the weekend.

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  4. Cool. The more I play with it maybe the resonance knob is unrelated. It seems like the culprit is in the 3 band eq. I lose all volume depending on how extreme I set the knobs. It's interactive. Kinda strange. This thing is still pretty sweet anyway.

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  5. Did you ever get a chance to look this over? I know Dino used Millenium bypass on his pcb so its throwing me off, but is that 4.7m resistor from input to high 1 right? Still trying to figure mine out. (Kinda forgot about it til an hour ago, ha!)

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    1. ooops, I forgot about it too! Ok, I'll take a look after the weekend especially that 4,7M resistor and the area sorrounding Resonance pot.

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    2. Did it got verified (volume loss issue)?

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  6. Thank you for the layout.
    Is it verified now ?

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  7. Hello,
    Is this layout based upon the original schematic, or from the DeadEndFX reworked schematic?

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  8. Hello
    I built the veroboard circuit today (It isn't wired yet), and it is very nicely laid out. A little suggestion would be to move the 100µF cap one bit on the right, and the 2.2µF NP cap one bit on the left, so both have more space to live side by side :)
    I will let you know if it works and how it sounds when it's finished.

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    1. Interested to hear how yours turns out. I never did get mine ironed out and I just put it in the pile of conundrums and forgot about it. Need to dig it out and look at it with fresh eyes.

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    2. Totally fgorgot to check this one. I will be away from home until the weekend so I'm not able to update the layout until then.

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  9. Hi,there is interaction between the controls a according to their setting, but i have not found any error with respect to the diagram.Maybe that's how it's sopposed to work.The 4,7M resistor is not in the diagram.A 15K resistor between Hi1 and ground improves thing a bit.

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