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03-14-2019, 12:26 PM
Hi sinusoids
ERK (Electronic Relay Kit) is the usual means to channel switch the LPSP. (LP-PRE in kit form). ERK needs negative voltage, so if there is a fixed bias supply to tap then you do not need anything extra.
ERK uses jfets for the switching, and these are located on the pots or the card as is convenient.
Build the amp first and then lay in the switching as another layer, as it were. Testing prior to switching requires turning controls up and down to hear the two channels independently.
LPSP is voiced as a Fender clean channel and hot-rodded Marshall lead channel. The latter particularly can be voiced as hot or mild as you want simply by changing Rs or Cs, any of which can be made switchable themselves (as presets typically).
When you look at a project like The Standard, you can decide to build only a portion of it and/or change any part of it. For example, you could build it without the effects loop, or without the reverb, or without both reverb and effects loop, or just as a preamp. You could replace the push-pull PA with a single-ended amp. The relevant point to you being that in this instance where the TOT project and the TUT5 projects use the same preamp circuit, you have two examples of how to build it.
Another important point when considering a project is to look at a lot of other projects that do not seem related, as there might be a good idea to lift and incorporate into yours. For example, the Body control in the TUT3 SVT project can be applied to any push-pull amp.
ERK (Electronic Relay Kit) is the usual means to channel switch the LPSP. (LP-PRE in kit form). ERK needs negative voltage, so if there is a fixed bias supply to tap then you do not need anything extra.
ERK uses jfets for the switching, and these are located on the pots or the card as is convenient.
Build the amp first and then lay in the switching as another layer, as it were. Testing prior to switching requires turning controls up and down to hear the two channels independently.
LPSP is voiced as a Fender clean channel and hot-rodded Marshall lead channel. The latter particularly can be voiced as hot or mild as you want simply by changing Rs or Cs, any of which can be made switchable themselves (as presets typically).
When you look at a project like The Standard, you can decide to build only a portion of it and/or change any part of it. For example, you could build it without the effects loop, or without the reverb, or without both reverb and effects loop, or just as a preamp. You could replace the push-pull PA with a single-ended amp. The relevant point to you being that in this instance where the TOT project and the TUT5 projects use the same preamp circuit, you have two examples of how to build it.
Another important point when considering a project is to look at a lot of other projects that do not seem related, as there might be a good idea to lift and incorporate into yours. For example, the Body control in the TUT3 SVT project can be applied to any push-pull amp.
