Hoffman Amplifiers Tube Amplifier Forum

Amp Stuff => Tube Amp Building - Tweaks - Repairs => Topic started by: newguitarsmell on May 27, 2020, 12:59:35 pm

Title: Amp noise
Post by: newguitarsmell on May 27, 2020, 12:59:35 pm
Hi everyone
Curious - if I run my choke wires over my turret board instead of under, will that cause noise?
Thanks.
Title: Re: Amp noise
Post by: SILVERGUN on May 27, 2020, 01:06:15 pm
Hi everyone
Curious - if I run my choke wires over my turret board instead of under, will that cause noise?
Thanks.


No


Ok, here's the thing. Randomly running choke wires over an unpopulated section of board won't in itself cause noise, that's where my answer came from.
Without any other info (that you haven't given), that's all there is.

Title: Re: Amp noise
Post by: shooter on May 27, 2020, 01:32:13 pm
Use a big marker and write on your wall, NEVER mix High current wires with low current wires.
Or something like;
I need to read about inductive coupling between wires
 :icon_biggrin:
Title: Re: Amp noise
Post by: newguitarsmell on May 27, 2020, 02:02:18 pm
Hey Shooter.
OK. Dumb ass question. Which are the high voltage ones and which are the low voltage ones?
And the choke question was just an "in general"... if there is such a thing as that, in this world.
Title: Re: Amp noise
Post by: shooter on May 27, 2020, 02:59:55 pm
https://en.wikipedia.org/wiki/Inductive_coupling

really is worth the read.
general questions beget general answers which generally don't help much

And is more about current than voltage
Title: Re: Amp noise
Post by: mresistor on May 27, 2020, 03:28:04 pm
Hey Shooter.
OK. Dumb ass question. Which are the high voltage ones and which are the low voltage ones?
And the choke question was just an "in general"... if there is such a thing as that, in this world.


I don't think he said high "voltage" wires..      pay attention
Title: Re: Amp noise
Post by: pdf64 on May 27, 2020, 03:44:44 pm
Use a big marker and write on your wall, NEVER mix High current wires with low current wires.
Or something like;
I need to read about inductive coupling between wires
 :icon_biggrin:
I think of this as ‘avoid bringing the powerful transmitters too close to any sensitive receivers’.
Maintaining a reasonable degree of separation between them will avoid problems (and kludgy solutions) down the road
Title: Re: Amp noise
Post by: shooter on May 27, 2020, 04:10:37 pm
As PDF64 eluded to;
If it's in the preamp keep it away from the power supply and PA section.

I didn't look up the math and I'm hot and sore, but I think it's a distance squared thing