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In Reply to: RE: Update on Sophia EL34 amp from 2 weeks ago. posted by Michael Samra on April 06, 2014 at 14:59:24
Mike, how do you get this thing to be quiet? I know it must be, to pass your criteria. It's just that if any guitar amp had what appears to be that bird's nest wiring --- it would hum like crazy and maybe unstable.I go through the wiring and lift or lower all signal lines. Put AC lines (like heater and PT) in another plane. And try to make wires cross at 90-degree angles. In these guitar amps, it makes quite a difference. Eliminating some hiss, hum, and that annoying tremolo circuit "ticking."
Are there some tricks that you use to help reduce inducted noise and hum? Some circuitry tricks?
Thanks._
1962 Pro:
DIY Princeton Reverb:
Edits: 04/07/14 04/07/14 04/07/14Follow Ups:
There is a lot more gain in a guitar amp.
Tre'
Have Fun and Enjoy the Music
"Still Working the Problem"
Tre', thanks for the response. Never thought about gain and amplification of noise and hum.I would think that lead dressing and layout would help, even in low gain setups. Can't hurt. Right?
Sure would make repairs & mods a lot easier.
Edits: 04/07/14
I think so FL. Just because we cannot hear anything obvious - like hum - does not mean poor layout is not having an adverse effect.
If an amp amplifies the difference between signal and ground and the ground (or signal) is grubby... As Tre has pointed out, high gain can make (some of) these adverse effects more obvious.
I think that minimising connections to posts/ tags/ turrets and keeping components away from metal chassis perimeters as in the Sophia amp is a path to minimising some adverse effects. However, I don't think they are realising all the benefits of this due to what looks to me like a convenient and haphazard implementation applied to the amp in general. Further, I have concerns about the reliability and maintainability of their implementation, which is partially confirmed by other's experiences with Sophia amps.
Cheers.
“As long as we have any intention to be right… we should be wary. So long as words have the slightest ego attachment, they are dishonest.” Charlotte Joko Beck
I think that minimizing connections to posts/ tags/ turrets and keeping components away from metal chassis perimeters as in the Sophia amp is a path to minimizing some adverse effects.
On one hand, it's a band aid for schotty workmanship.
That rats nest, with wire and leads piss poorly dressed can also be the root cause.
We all agree (except xxx) Design, Layout and Parts selection make for a sound implementation without/minimal headaches.
I use solder terminals to make mechanical connections; multiple wires are twisted and wrapped around the terminal.
Sophia builds red-neck dreck at champagne prices.
IMHO/HE of course.:-)
Cheers,
W
"I would think that lead dressing and layout would help, even in low gain setups. Can't hurt. Right?"
Sure, but it's really important when there's a ton of gain.
Tre'
Have Fun and Enjoy the Music
"Still Working the Problem"
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