Miniblok Resistor Parameter Modulation using Pots - diyAudio
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Old 5th January 2013, 11:41 PM   #1
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Default Miniblok Resistor Parameter Modulation using Pots

So I'm thinking of putting a Miniblok Tube Amplifier into a chassis from a guitar amplifier, which has three knobs on it: Volume, Tone, and Overdrive. Are there any resistors in this schematic which may be safely replaced with one of the tone or overdrives pots to experiment with the sound? I'm planning to just use it as an audio amplifier, not a dedicated guitar amp. The chassis just fits really well in my workspace.
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Old 6th January 2013, 02:23 PM   #2
DF96 is offline DF96  England
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The quick answer is no. The resistors in that circuit have been chosen to provide good performance. Changing them is likely to degrade performance. Of course, this may be what you want?
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Old 6th January 2013, 02:24 PM   #3
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Yes, more specifically, I'd like to know which of these R values were chosen for their optimum listening features, as opposed to the ones chosen our of necessity for current limiting to the tube and safety reasons.
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Old 6th January 2013, 02:31 PM   #4
DF96 is offline DF96  England
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The resistors feeding the LEDs were chosen for appropriate brightness. All the rest will have been chosen for correct circuit operation as a simple audio amplifier. "Current limiting and safety reasons" would only come into play if you changed them too much, but well before then you would get poorer circuit performance.

If you want to change a circuit, first you have to learn how it works.
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