Hoffman Amplifiers Tube Amplifier Forum

Amp Stuff => Tube Amp Building - Tweaks - Repairs => Topic started by: Canezila on August 15, 2024, 01:43:47 pm

Title: Technical question about where one might hook up the efx loop for use as a bass
Post by: Canezila on August 15, 2024, 01:43:47 pm: I was thinking about my next project.

My thinking:
Use the SLO build by Rob Robbinette and build a 100 watt version.

Then add an FX loop and plug into the bass preamp pedal and out into the preamp return.

I read that the SLO power section is supposed to be clean so that sounds like it could work.

Why use the SLO? Because I love the sound of it when I want to play guitar. Then it would be a utilitarian setup for me.

I would be using different cabinets. The bass version would have a bass cabinet to play through.

Would this work? Are there better ways?

Thanks
Title: Re: Technical question about where one might hook up the efx loop for use as a bass
Post by: AlNewman on August 15, 2024, 08:36:05 pm: Can you post the schematic that you'd like to use?
Title: Re: Technical question about where one might hook up the efx loop for use as a bass
Post by: tubeswell on August 15, 2024, 11:25:34 pm: Sounds like you should just build an SLO100 and plug into the FX loop

https://el34world.com/charts/Schematics/files/Soldano/Soldano_slo100.pdf (https://el34world.com/charts/Schematics/files/Soldano/Soldano_slo100.pdf)
Title: Re: Technical question about where one might hook up the efx loop for use as a bass
Post by: stratomaster on August 15, 2024, 11:44:46 pm: Quote from: tubeswell on August 15, 2024, 11:25:34 pm
Sounds like you should just build an SLO100 and plug into the FX loop

https://el34world.com/charts/Schematics/files/Soldano/Soldano_slo100.pdf (https://el34world.com/charts/Schematics/files/Soldano/Soldano_slo100.pdf)

It looks like this FX loop is pre-tonestack though.

You could move the FX loop on your build to post tonestack but pre channel master. You could also use a shunting jack that acts as an input to the PI, but is essentially a jumper when nothing is plugged in.
Title: Re: Technical question about where one might hook up the efx loop for use as a bass
Post by: Canezila on August 16, 2024, 11:24:16 am: Yes, I believe the fxloop is before the tone stack. Moving it to after should be what I am looking for.
Title: Re: Technical question about where one might hook up the efx loop for use as a bass
Post by: AlNewman on August 16, 2024, 09:00:07 pm: One thing to consider about using a guitar amp as a bass amp, especially a high preamp gain amp like a soldano, is they will limit the low end frequency at the output to tame the power section. So, you may not get the expected results using it with a bass guitar.
Title: Re: Technical question about where one might hook up the efx loop for use as a bass
Post by: stratomaster on August 16, 2024, 11:10:08 pm: The PI is relatively full frequency. If he injects the bass signal right before the PI with adequate preamplification and into a bass cab, then there should be no problem.

The more I think about it, the more I think you should build the SLO as designed and just use a shunting jack right before the PI input cap. This way you have a full functioning SLO and a "power amp in" jack.