You can fine tune your tube amplifier with one tube substitution. The tube that you want to change is V1 which is the first gain stage preamp tube. You can tailor the gain structure with different tubes making your amp run cleaner or dirtier and also change the dynamics. For example changing a 12AX7 for [...]

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 Preamp Tube Gain Factor and Substitution Chart
12AX7 Family Tube Substitution
The 12AX7 family of dual-triode preamp tubes consists of the 12AX7, 5751, 12AT7, 12AY7, 12AV7 & 12AU7. These are all pin compatible with one another, the only differences being the gain factor of each tube. A common substitution is to replace a 12AX7 with a 5751 [...]

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The Brown Note  D’lite amp is a point to point tube amplifier based on a Dumble design and is available in kit form as well as completely assembled. There is no difference between the kit version and the assembled version. This particular review will be of the kit version; the assembly process as well as [...]

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