DOD FX10 BiFET Preamp

by alex on June 30, 2011

DOD FX10 BiFET Preamp Share This:

[This is an update to an earlier post. Since then we have done some more testing of this unit with different instruments and amplifiers.]

I was looking for a good analog pedal to overdrive my tube amp without loosing that “great Gretsch sound” of my Electromatic. The DOD FX10 was originally built as a preamp for acoustic guitars, but I had read some pretty good things about using the FX10 as a clean boost, so thought I’d give it a try. I ordered this one online from Studio 1525 (BTW: Studio 1525 has a huge selection of vintage pedals). According to the America’s Pedal web site, the FX line of pedals was first introduced by DOD in 1982, and the FX10 was part of the first group of FX pedals released that year. It remained in production through the mid-1990’s. According to the date code on this FX10’s pots, it was made in 1983. This sample is the original version that has the really cool larger knobs, similar to some other respected DOD pedals of that era.

DOD FX10 Specifications

  • Gain of +17 DecibelsDOD FX10 BiFET Preamp InternalDOD FX10 BiFET Preamp Front View
  • Controls: Level and Tone (CTS pots)
  • Jacks: ¼” In and Out
  • Construction: Die Cast Metal Box
  • IC: TL062 Dual Op Amp, TI Malaysia
  • JFET: Two J113’s
  • Bypass Switch: CMOS 4007
  • Power: 9-volt battery or PS125 (10VDC)
  • Mfrd: 1983 in USA
  • Dimensions: 3″x5″x1½”
  • Serial No: FX216329

How does it sound?

Others have reported more success with this pedal than I have been able to achieve. It does perform OK on a guitar amp when both controls are kept between 0 and 6 (up to about 2 o’clock on the dial). But above those levels it will add a significant amounts of noise.

Originally, I tested this unit with an old Silvertone tube amp. Initially I was disappointed, because, even though the pedal boosted the amp into overdrive, it was pretty noisy and thickened my guitar’s tone more than desired. But that could have been due to the minimal (or no) shielding in the old tube amp. So I took the pedal out of chain and set it aside for awhile.

Later, I tested this pedal on a solid-state Univox bass amp and it really did a good job of boosting the signal without changing the original tone of the guitar. And unlike before, it barely added any signal noise into the chain of effects. So obviously the combination of equipment makes a big difference.

More photos…

DOD FX10 BiFET Preamp PedalDOD FX10 BiFET Preamp PedalDOD FX10 BiFET Preamp Pedal

DOD FX10 BiFET Preamp Label Made in USADOD FX10 BiFET Preamp InternalDOD FX10 BiFET Preamp Printed Circuit Board (PCB)DOD FX10 BiFET Preamp Printed Circuit Board (PCB)

Additional online resources for the DOD 10FX:

Shop: Studio 1525 Preamps
Shop: Search ebay for DOD FX10
Info: America’s Pedal
Info: DiscoFreq’s Effects Database

{ 6 comments… read them below or add one }

Casey January 21, 2014 at 1:55 pm

Also sounds great on bass w/ flatwounds…tone knob almost all the way down and level at unity or a little higher


Michael Coughlan December 31, 2016 at 12:33 am

Running an FX10 into my Red Llama MKII and then into an old Roland Cube-40 Chorus solid state amp. Wow. It’s a cheap Fender Deluxe 5e3 substitute. Certainly gets you into the realm of that tweed sound with a solid state.


alex December 31, 2016 at 5:14 pm

That sounds just like a setup that I would like to try. Love the classic tweed 5E3 tone of the Deluxe. Thank you!


Michael Coughlan January 1, 2017 at 12:18 am



Jeffrey February 25, 2017 at 5:37 pm

l have had 2 the first mod and the last 90’s.l use it with Mic and Bug on my Sax very clean sound great investment.


alex March 12, 2017 at 8:38 pm

Cool! Thanks Jeffrey!



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