Can the LSS be used as a 'pre-amp'

[ja22y]

I want to connect an external power amp to it so my thinking is either connect the poweranmp to the fx send or the slave. But I want to be able to disable the LSS power section or not connect it to the speaker and just use the external power amp.
If anyone has done somthing similar let me know what works best. thanks

 

[phyrexia]

You need a dummy load of some kind.

Check this out:

http://www.google.com/search?hl=en&q=dummy+load+guitar+amp

 

[lyman]

phyrexia is right that you'll need a dummy load if you want to disconnect the speaker. but you could also go from the preamp out (fx loop) into a power amp. that way you don't even need to disconnect the speaker(s) and you'll get no sound from them either.

i assume the LSS has a parallel loop. if there's a wet/dry knob you might have to turn it to 100% wet. that way you'll get no dry signal and thus no sound from the LSS.

i don't have an LSS so please correct me if i'm spreading bad info! just because it's on the internet doesn't mean it's true!

 

[ja22y]

The Lonestar has series fx loop. So I'm thinking if I connect the fx send to the power amp, not connect the fx return, then it would be like an open circuit on the power section input. Would a dummy load necessary if the power section has no input signal and not driving anything? Also wouldn't the dummy load affecting the tone?
Anyone know how the 'slave' output is to be used? first I thought that this is the 'pre-amp' out but looks like it's another speaker out of sort so it a high level signal.

 

[RocksOff]

the slave out is used to drive other amps with a signal from your preamp, if i'm not mistaken.

 

[simonich]

the slave out is used to drive other amps with a signal from your preamp, if i'm not mistaken.

Actually, I think the slave out carries the power amp signal too vs. only the pre-amp.

He can take the fx send (which is only the LSS pre-amp) and put that into the input of the power amp. That should be fine. He'll need to leave the power tubes in the LSS and the speaker connected. Zero the output knob and no sound will come from the LSS speaker.

 

[ja22y]

the slave out is used to drive other amps with a signal from your preamp, if i'm not mistaken.

Actually, I think the slave out carries the power amp signal too vs. only the pre-amp.

He can take the fx send (which is only the LSS pre-amp) and put that into the input of the power amp. That should be fine. He'll need to leave the power tubes in the LSS and the speaker connected. Zero the output knob and no sound will come from the LSS speaker.

simonich, that's exactly my thought. The only caveat if it's a head, I still need to plug the output into some speaker or load.
I still don;t get the slave out. How do you suppose to drive other amp if it has the power amp signal? All the power amp I know take line level only.

 

[RocksOff]

I was sure the slave out is line level only... otherwise it would be a speaker output.

 

[domct203]

I was sure the slave out is line level only... otherwise it would be a speaker output.

The slave out is tapped off the output transformer, and it's signal can get very hot when the amp is cranked. It is made to feed the effects (wet) amp, or even a stereo rig in addition to the main (dry) rig in a W/D/W setup. Some use it with a speaker simulator to feed the FOH system.

IMO if you are using a simular tube stereo poweramp and guitar cabs you would be better using the FX send. In theroy, if you do not send a signal back into the FX return you will not be using the power section, but I would not risk it with a $2K amp. Get a dummy load. They come in handy when setting bias as well.

If you're using a SS amp, try the slave out to capture the power tube character from the LSS.

Dom