Frenzel FM-DP1 "Deluxe BF - Plexi" Dual-Channel Hand-Wired Tube Guitar Preamp USA Made

The Frenzel FM-DP1 "Deluxe Plexi" is a dual-channel guitar/bass tube preamp voiced after the Fender Deluxe (Type F input) and Marshall Plexi (Type M input), hand-built by Frenzel Tube Amps in Texas. This is a genuinely boutique, hand-wired unit with a devoted following. Frenzel does not use dealers or distributors — their amps and preamps only appear in retail music stores occasionally as used items, and all products are custom built by hand as ordered, with lead times of at least 2 months.

This is a Frenzel custom guitar tube preamp designed and hand-built in the USA by Frenzel Tube Amps — a boutique Texas builder with over 65 years of tube amp experience. The FM-DP1 "Deluxe Plexi" is Frenzel's flagship preamp, offering two completely independent preamp channels in a single compact unit: the Type F input delivers vintage Fender Deluxe warm, smooth clean tones, while the Type M input gives you classic Marshall Plexi high-mid rock tones.

Pull-bright switches on both gain controls, a pull-deep switch on the bass, a classic 3-band tone stack, master volume, and a rear-panel trim control let you match output to any amp, mixer, or recording interface. The all-aluminum open chassis construction with polished tube covers gives it a striking, industrial appearance. With this tube preamp you only need to concern yourself with smaller preamp tubes — 2x 12AX7 and 1x 12AU7 — none of the expensive power tubes required by full amplifiers.

Works between guitar and amp, in an effects loop, direct to recording interface, or driving a PA. Serial 12053, 120VAC, working condition — fully tested and ready to go.

Lead time for new Frenzel orders runs at least 2 months, likely more depending on supply chain and backlog — which is why used units command a meaningful premium over a long wait for new.

SpecsBrandFrenzel Tube Amps, Texas, USAModelFM-DP1 "Deluxe Plexi"Serial12053Tubes2x 12AX7, 1x 12AU7 (standard config)ChannelsDual — Type F (Fender Deluxe voiced) + Type M (Marshall Plexi voiced)ControlsF Gain (pull bright), M Gain (pull bright), Bass (pull deep), Middle, Treble, MasterInputsF In (1/4"), M In (1/4") — front panelOutput1/4" rear panel + Trim controlPower120VAC, 1A fuseConstructionHand-wired point-to-point, open aluminum chassisConditionConfirmed working