Hoffman Amplifiers Tube Amplifier Forum
Amp Stuff => Tube Amp Building - Tweaks - Repairs => Topic started by: hiegdk on November 20, 2025, 06:57:48 pm
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I'm considering building a standalone preamp based on the DR103 circuit here: https://hiwatt.org/Schematics/DR_PreLinkedInput_v1.gif (https://hiwatt.org/Schematics/DR_PreLinkedInput_v1.gif)
How should the Output 1, Output 2, and OT tap connections be handled? I suppose I should be ommiting V4? If the intent is to simply have an output suitable for running into a power amp what modifications should I be making? Thanks!
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Yes, for that particular preamp, as a stand alone preamp I agree. Just keep V1, V2 and V3 and leave out the LTP. The CF will be ideal for driving the signal cable to your power amp etc.
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Is it possible to retain the Presence control in that case? Would I just source the tap from pin 3 of V3?
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Is it possible to retain the Presence control in that case?
No you can’t retain the presence control from the amp - because it takes its feedback source from the OT secondary, and you would only be building the preamp.
However, if you want an active tone control that functions like a presence control, you could incorporate such a device into the preamp. Google is your friend.
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Gotcha, thanks!