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Preamp vs amp block

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Which block should I use (preamp or amp) if I am going from the 1/4 out from the Helix to the effects return of my tube amp? I want the Helix to provide my tone of course and I know to not use a cab block. I am confused as to the difference between the two. Thanks!

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Try both. Many will say preamp, but I found I liked the full amp better into the loop return of my egnater.

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Let's say your amp is a Hot Rod Deville (HRD). Typically you'd use the 5150 preamp, replacing the HRD's preamp with the 5150 preamp. If you use the full 5150 amp, you're amping the full 5150 amp, pre and power, through the HRD power amp and speaker. If you use the 5150 amp and a speaker cab - hey, it's just a tone. If it sounds good, go for it! The joy of modeling is - NO RULES!

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You won't break anything by trying both. Experiment with the bass amp models too, you'll be surprised. 

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Thank you for the replies. I will play around with both options. I am dialing in a clean Mesa and dirty JCM 800 tone tonight. I just got the Helix LT this week, and I am astounded by all of the routing and tone shaping ability. I also enjoy this message board; it's very professional and helpful overall.

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I prefer to use pre amp models into the return of my jcm2000. 4 cable method works fantastic...A/B-ing my preamp with helix 2204 is amazing...very very close. I notice less gain using only preamp vs full amp. But more gain can always be achieved by cranking my poweramp!! I shouldn't call it gain I guess...more dirt!

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Preamp ended up sounding better in my situation. The full amp made the overall volume get a bit crazy. That's the fun of amp modeling, I guess.

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