AC30 "motorboat" sound

insombob · June 26th, 2008, 12:17 PM

i rarely use the normal channel of my ac30, but lately i've noticed a strange 'motorboat' kinda sound coming through that channel only. any guesses as to what that might be caused by?

teleamp · June 26th, 2008, 12:20 PM

Quote:

Originally Posted by insombob

i rarely use the normal channel of my ac30, but lately i've noticed a strange 'motorboat' kinda sound coming through that channel only. any guesses as to what that might be caused by?

Is it a Vox, or a clone?

CasinoBoogie · June 26th, 2008, 12:23 PM

this sounds like the same sort of sound i'm getting with my blues junior

teleamp · June 26th, 2008, 12:34 PM

"Motorboating" is usually a result of bad lead dress, or not enough filtering in the power supply.

Edit, added: Is it a womp womp womp womp sound at a steady pace that gets deeper as you turn up the volume?

ac15 · June 26th, 2008, 12:42 PM

I'm pretty certain that can be a symptom of a bad preamp tube. I've got that on more than one amp, and in one case it only occurred after changing tubes.

guitarzan13 · June 26th, 2008, 12:43 PM

sorry..... I was thinking of a different kind of motorboating

insombob · June 26th, 2008, 06:28 PM

yeah, it seems to be more apparent as i turn up that channel's volume. and it's a vox from around '96 (in lovely fawn).

furrfurrfurr · June 26th, 2008, 06:30 PM

Quote:

Originally Posted by guitarzan13

sorry..... I was thinking of a different kind of motorboating

Hey I didn't know your name was Alex, man.

JimiBryant · June 26th, 2008, 06:50 PM

I had an amp problem like that once; it was the coupling caps.

June 26th, 2008, 12:17 PM	#1 (permalink)
insombob TDPRI Member Join Date: Sep 2003 Posts: 56	AC30 "motorboat" sound i rarely use the normal channel of my ac30, but lately i've noticed a strange 'motorboat' kinda sound coming through that channel only. any guesses as to what that might be caused by?

June 26th, 2008, 12:34 PM	#4 (permalink)
teleamp Tele-Holic Join Date: Oct 2006 Location: Central TX Age: 49 Posts: 534	"Motorboating" is usually a result of bad lead dress, or not enough filtering in the power supply. Edit, added: Is it a womp womp womp womp sound at a steady pace that gets deeper as you turn up the volume? Last edited by teleamp : June 26th, 2008 at 02:17 PM.

June 26th, 2008, 12:43 PM	#6 (permalink)
guitarzan13 Tele-Afflicted Join Date: Jul 2006 Location: LaGrange, GA Age: 43 Posts: 1,178 8 Photos	sorry..... I was thinking of a different kind of motorboating __________________ Practice make permanent!!!!....Perfect practice makes perfect!!! Chris B. Current Band www.productoffaith.net Last band as a bass player www.neonjones.com

June 26th, 2008, 06:50 PM	#9 (permalink)
JimiBryant Tele-Afflicted Join Date: Sep 2007 Location: Chicago Chicago that toddlin' town Age: 46 Posts: 1,495	I had an amp problem like that once; it was the coupling caps. __________________ I am very proud of the fact that I'm so humble!

June 26th, 2008, 12:23 PM	#3 (permalink)
CasinoBoogie Tele-Meister Join Date: Jan 2007 Location: London Posts: 161	this sounds like the same sort of sound i'm getting with my blues junior

June 26th, 2008, 12:42 PM	#5 (permalink)
ac15 Tele-Holic Join Date: May 2005 Location: CHICAGO, IL. Posts: 510	I'm pretty certain that can be a symptom of a bad preamp tube. I've got that on more than one amp, and in one case it only occurred after changing tubes.

June 26th, 2008, 06:28 PM	#7 (permalink)
insombob TDPRI Member Join Date: Sep 2003 Posts: 56	yeah, it seems to be more apparent as i turn up that channel's volume. and it's a vox from around '96 (in lovely fawn).