Hum in Legend amp

Nixie · 23rd February 2007, 03:30 AM

I'm having trouble tracking down the source of buzz/hum in a 70s guitar combo amp, a Legend Super-lead 50. It's a hybrid, with solid state output. The buzz/hum seems to be from the high gain input; from what I can tell the other input bypasses the first tube, and if I turn down the Lead Level knob it also goes down (but of course, loss of volume). Any troubleshooting suggestions? The hum/buzz is the same regardless of what position the 3-way ground lift switch is.

Trout · 23rd February 2007, 03:40 PM

Wow, Those old Legends are Sooo cool, I love those solid oak cabs, Unless Im carrying them

There is very lettle documentation on the web for those babies, I nearly bought a couple a while back at a local MOM N POP music store that still has 2 of them that never sold.

I think I would start at the input jacks, Make sure they are closing/shorting properly. I have seen those old jacks cause a lot of problems like that due to tarnish and or oxidation.

Good luck finding a schematic though, I have never been able to locate one.

Trout

Nixie · 23rd February 2007, 09:02 PM

I found someone selling one but they're asking $15...

Trout · 25th February 2007, 01:06 AM

Hey Nixie,

This topic just came up on another forum I frequent. Anyways, This may be just what you looking for.

http://legendamps.tripod.com/

There are full schematics posted here.

They are sort of small pictures, But at least you can get the general info you might find yourself needing.

Trout

23rd February 2007, 03:30 AM	#1
Nixie Banned Join Date: Jan 2006 Location: Vancouver, BC	Hum in Legend amp I'm having trouble tracking down the source of buzz/hum in a 70s guitar combo amp, a Legend Super-lead 50. It's a hybrid, with solid state output. The buzz/hum seems to be from the high gain input; from what I can tell the other input bypasses the first tube, and if I turn down the Lead Level knob it also goes down (but of course, loss of volume). Any troubleshooting suggestions? The hum/buzz is the same regardless of what position the 3-way ground lift switch is.

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23rd February 2007, 03:40 PM	#2
Trout diyAudio Member Join Date: Nov 2004 Location: Midwest Madman	Wow, Those old Legends are Sooo cool, I love those solid oak cabs, Unless Im carrying them There is very lettle documentation on the web for those babies, I nearly bought a couple a while back at a local MOM N POP music store that still has 2 of them that never sold. I think I would start at the input jacks, Make sure they are closing/shorting properly. I have seen those old jacks cause a lot of problems like that due to tarnish and or oxidation. Good luck finding a schematic though, I have never been able to locate one. Trout

23rd February 2007, 09:02 PM	#3
Nixie Banned Join Date: Jan 2006 Location: Vancouver, BC	I found someone selling one but they're asking $15...

25th February 2007, 01:06 AM	#4
Trout diyAudio Member Join Date: Nov 2004 Location: Midwest Madman	Hey Nixie, This topic just came up on another forum I frequent. Anyways, This may be just what you looking for. http://legendamps.tripod.com/ There are full schematics posted here. They are sort of small pictures, But at least you can get the general info you might find yourself needing. Trout

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