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By "Aux in" I take it you mean an input that can take another source such as backing track to mix with the attenuated guitar signal? Such a facility would mean active devices in the load box and attendant power supplies (or batteries..Ugh!) That is going to make the whole thing much more expensive.
Just a thought? If the final aim is some form of recording you could just get a basic power soak/LB and a small USB mixer. I have just bought a Soundcraft Notebook 8FX for my son and it works a treat. 24 bit recording, a VAST improvement on the noisy, 16 bit early USB mixers.
Dave.
https://www.uaudio.com/hardware/ox.html
I don't think you will get the Aux in.
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I love the OX but its the price of a high end amp in itself. The Notebook approach isn't a bad solution.
For that approach what Power Soak would you recommend?
ICBM is your man for matching amps to power soaks!
As you might be going for a DIY solution include a 1:1 audio transformer in the line out feed. This gives 'galvanic' isolation and, in conjunction with an Earth Lift switch eliminates bothersome hum loops. The output would also be balanced, a very desirable feature.
Dave.
I never actually tried attenuating my Super Champs when I had them, but since it's a standard Fender 8-ohm output (with high negative feedback, for the technically-minded!) it should probably not be very fussy about attenuators. You need a minimum power rating of about 35W if you're planning to drive it hard, but most commercial load boxes will handle at least that with no problem.
If the Super Champ is stock you will need to replace the daft hardwired speaker connection with a jack and plug, but luckily the hole in the amp is in the right place! Since it was obviously designed for it originally and then an accountant decided they needed to save about a dollar...
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