Hoffman Amplifiers Tube Amplifier Forum
Amp Stuff => Tube Amp Building - Tweaks - Repairs => Topic started by: fossilshark on May 30, 2023, 10:47:39 pm
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Hi all, with much credit going to you lovely people here on EL34world I finished the "Wendigo" preamp. It is the Ceriatone Chupacabra circuit turned into a rack mount preamp. This thing sounds absolutely killer and the options all the different settings give are endless.
As expected for a high gain preamp this boy is quite noisy at max gain. So I plan on adding a bunch of shielded cable to the controls (and the long yellow wire going to the output), the potentiometer near the transformer is going to be replaced with a fixed resistor, and I will add the resistor divider humdinger circuit to the heater line as previously recommended.
I was just wondering if anyone has any advice for my layout? The blue and black twisted pair is the heater wires and I am worried they are much too close to the output jack, maybe I should use shielded wire for the heaters?
Again I appreciate all who helped me get the circuit made up, and I appreciate any input on what I could change to make this layout better.
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OMG :bump1:
:bravo1: :bravo1: :bravo1:
:thumbsup: :thumbsup: :thumbsup:
:worthy1: :worthy1: :worthy1:
Have you a layout you can share ?
THANKS
Franco
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Fantastic job!
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Just a suggestion - See attached.
Respectfully,
--Pete
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Fantastic job!
OMG :bump1:
:bravo1: :bravo1: :bravo1:
:thumbsup: :thumbsup: :thumbsup:
:worthy1: :worthy1: :worthy1:
Have you a layout you can share ?
THANKS
Franco
Haha thanks guys! I really wanted this one to be perfect. I will post all my documentation with some sound clips after I evict the noise gremlin.
Just a suggestion - See attached.
Respectfully,
--Pete
I was thinking this originally but I guess I was thinking too hard, the negative terminal of the caps should shield them right?
Used some PTO so I can stay home and work on this all day :icon_biggrin: I will implement some tweaks and keep yall updated.
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The negative ends of the caps are at ground potential. Not shielding per-se but not as susceptible to eddy currents produced by heater conductors.
With as much gain as you built, DC heaters would likely have been of benefit to this plan.
Respectfully,
--Pete
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Just a suggestion - See attached.
Respectfully,
--Pete
Even without shielding that long output wire this seems to have worked well, thanks dummyload. I threw in the humdinger and switched the janky pot for a fixed resistor and its already leagues better. With the volume on max you can almost hear a 60/120hz but it really is negligible.
I am just chasing a very small amount of static noise from the input section now. Nothing a bit of shielded cable can't take care of I think.
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Really beautiful job!
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Really beautiful job!
Thank you! I am not entirely happy with it mostly due to aesthetics but hey gotta know when to put the soldering iron down amiright?