Fender-channel jumpering?

mojohen · May 11th, 2006, 09:38 PM

on my 68 SR?
Any reason why I couldn't jump channel 1 first input with the vibe channels first input? If I cqan without damaging anything, what results could I expect?
I could only assume that V1 would then be used along with V2 and V4, so more gain? Maybe earlier breakup?
Just pondering...
Oh, and I just inserted a janGE5751 in V1 with great results. Nice wark and harmonically rich..Less volume, purring gain at lower volume...Nice..

mojohen 8)

mad dog · May 12th, 2006, 10:01 AM

If I remember right, left channel on the SR is no reverb. If that's the case, it won't work. won't hurt anything, but it will sound very odd, out-of-phase due to unequal number of gain stages on the linked channels.

As long as gain stages are equal, jumpering usually works, and is usually very much worth experimenting with. Certain amps (my old Gibson GA40) get way excited when you jump channels. I never play this amp w/o jumpering. One channel is much hotter than the other. I can blend that in, almost like an in-amp OD.

Jumpering gives you the ability to tailor sounds to the instrument. For example, I run a strat through my Clark Typer into normal, volume on that pretty high, then into the Brite channel, volume on that one maybe 1/3 up. Were I playing a HB guitar, I'd reverse it.

You lose a little signal in the second, jumpered channel. For full signal, use an A/B/both buffered switcher. Same principle, maximum strength.

tlpruitt · May 12th, 2006, 10:25 AM

Mad Dog is correct. Unless the amp has been modified to have reverb on both channels (a relatively simple mod) the 2 channels are out of phase. If you link or jumper both channels so you are playing through both at the same time then it will not sound good since the 2 channels are out of phase. No harm to the amp, just poor sound. Try it and see for yourself.

You can get around this by modifying the amp to have reverb on both channels (which puts both channels in phase with each other) or use something like the Barber Launch Pad pedal to put your signal into both channels.

BTW, the 2 channels are in parallel so playing in both channels at the same time isn't really "adding" a gain stage.

-Tim

5965 · May 12th, 2006, 04:34 PM

You can do it, and it won't hurt anything. It can be useful.

Just don't run the volumes at the same level; that's where there is the strongest cancellation. Instead, offset them- one higher, the other lower. If Normal is higher, the Vibrato channel functions much like a tone control for the reverb and tremolo. There are also some interesting blues sounds.

It doesn't do anything to the gain, though.

There's a similar trick that involves connecting the reverb to the Normal via a patch cord.

vic108 · May 14th, 2006, 10:12 AM

Quote:

Originally Posted by 5965

It doesn't do anything to the gain, though.

From what I understand too....

PhatTele · May 15th, 2006, 09:56 AM

The out of phase issue will cause things to sound "bad" or "odd' if you jumper the channels using just the input jacks. However, as someone mentioned above, you can run a patch cord (with some RCA to 1/4" adaptors) from the reverb recovery ("out") into the input of the Normal channel. I've seen it done live in a BF Pro Reverb. It works pretty well. You're basically taking the wet part of the reverb signal and running it back through the other channel of the amp.

May 11th, 2006, 09:38 PM	#1 (permalink)
mojohen Tele-Meister Join Date: Apr 2006 Location: NY Posts: 177 12 Photos	Fender-channel jumpering? on my 68 SR? Any reason why I couldn't jump channel 1 first input with the vibe channels first input? If I cqan without damaging anything, what results could I expect? I could only assume that V1 would then be used along with V2 and V4, so more gain? Maybe earlier breakup? Just pondering... Oh, and I just inserted a janGE5751 in V1 with great results. Nice wark and harmonically rich..Less volume, purring gain at lower volume...Nice.. mojohen 8)

May 12th, 2006, 10:25 AM	#3 (permalink)
tlpruitt Tele-Meister Join Date: May 2003 Location: Baltimore, MD Posts: 230	Out Of Phase Mad Dog is correct. Unless the amp has been modified to have reverb on both channels (a relatively simple mod) the 2 channels are out of phase. If you link or jumper both channels so you are playing through both at the same time then it will not sound good since the 2 channels are out of phase. No harm to the amp, just poor sound. Try it and see for yourself. You can get around this by modifying the amp to have reverb on both channels (which puts both channels in phase with each other) or use something like the Barber Launch Pad pedal to put your signal into both channels. BTW, the 2 channels are in parallel so playing in both channels at the same time isn't really "adding" a gain stage. -Tim __________________ Art is making something out of nothing and selling it. FZ

May 12th, 2006, 10:01 AM	#2 (permalink)
mad dog Tele-Holic Join Date: Jun 2005 Posts: 697	If I remember right, left channel on the SR is no reverb. If that's the case, it won't work. won't hurt anything, but it will sound very odd, out-of-phase due to unequal number of gain stages on the linked channels. As long as gain stages are equal, jumpering usually works, and is usually very much worth experimenting with. Certain amps (my old Gibson GA40) get way excited when you jump channels. I never play this amp w/o jumpering. One channel is much hotter than the other. I can blend that in, almost like an in-amp OD. Jumpering gives you the ability to tailor sounds to the instrument. For example, I run a strat through my Clark Typer into normal, volume on that pretty high, then into the Brite channel, volume on that one maybe 1/3 up. Were I playing a HB guitar, I'd reverse it. You lose a little signal in the second, jumpered channel. For full signal, use an A/B/both buffered switcher. Same principle, maximum strength.

May 12th, 2006, 04:34 PM	#4 (permalink)
5965 Tele-Holic Join Date: Apr 2003 Posts: 725	You can do it, and it won't hurt anything. It can be useful. Just don't run the volumes at the same level; that's where there is the strongest cancellation. Instead, offset them- one higher, the other lower. If Normal is higher, the Vibrato channel functions much like a tone control for the reverb and tremolo. There are also some interesting blues sounds. It doesn't do anything to the gain, though. There's a similar trick that involves connecting the reverb to the Normal via a patch cord.

May 15th, 2006, 09:56 AM	#6 (permalink)
PhatTele Tele-Holic Join Date: Jun 2003 Location: Richmond, VA Posts: 677	The out of phase issue will cause things to sound "bad" or "odd' if you jumper the channels using just the input jacks. However, as someone mentioned above, you can run a patch cord (with some RCA to 1/4" adaptors) from the reverb recovery ("out") into the input of the Normal channel. I've seen it done live in a BF Pro Reverb. It works pretty well. You're basically taking the wet part of the reverb signal and running it back through the other channel of the amp.