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<blockquote data-quote="Art Welter" data-source="post: 40997" data-attributes="member: 52">Re: Preamp/channel strip questionTubes can sound very good for acoustic guitars, (and just about any instrument) whether their euphonic sound will make more than a subtle difference can only be found out by trying. Seems to me the tube is already in use, if the tube drive is turned up.The manual says:“When an instrument is plugged into the instrument input, the microphone preamp isbypassed, and the Studio Channel becomes an active instrument preamplifier.”It then says:“Input Gain/Trim Control. These knobs provide the following gain structure:XLR Microphone and TS Instrument/Hi-Z Inputs. 44 dB of variable gain (+10 dB to +54 dB)Tube Drive. The Tube Drive control increases the amount of signal routed through the 12AX7 vacuumtube. (The gain controls overall volume, whereas the drive controls volume routed through the tube.)The effect achieved ranges from subtle to extreme, depending on the setting being used:”The way I read it, only the mic pre is bypassed by plugging in to the 1/4” instrument input, it would seem the input has a parallel path through the 12AX7&nbsp; tube, the % of drive added is dependent on the drive pot position.If it was set to 0, no tube is in the circuit, the higher the tube drive, the more overdrive sound is added.Turn it up and see :^).Art Welter</blockquote>

[QUOTE="Art Welter, post: 40997, member: 52"] Re: Preamp/channel strip question Tubes can sound very good for acoustic guitars, (and just about any instrument) whether their euphonic sound will make more than a subtle difference can only be found out by trying. Seems to me the tube is already in use, if the tube drive is turned up. The manual says: “When an instrument is plugged into the instrument input, the microphone preamp is bypassed, and the Studio Channel becomes an active instrument preamplifier.” It then says: “Input Gain/Trim Control. These knobs provide the following gain structure: XLR Microphone and TS Instrument/Hi-Z Inputs. 44 dB of variable gain (+10 dB to +54 dB) Tube Drive. The Tube Drive control increases the amount of signal routed through the 12AX7 vacuum tube. (The gain controls overall volume, whereas the drive controls volume routed through the tube.) The effect achieved ranges from subtle to extreme, depending on the setting being used:” The way I read it, only the mic pre is bypassed by plugging in to the 1/4” instrument input, it would seem the input has a parallel path through the 12AX7 tube, the % of drive added is dependent on the drive pot position. If it was set to 0, no tube is in the circuit, the higher the tube drive, the more overdrive sound is added. Turn it up and see :^). Art Welter [/QUOTE]

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