Welcome back Gearheads! Today, I’ve have the pleasure to showcase a cool tube preamp pedal from Jim Hagerman of Hagerman Amplification. Jim Hagerman is based out of Honolulu, Hawaii and has been hand crafting tube based musical tools since 1982! Have a look at Hagerman’s story in his own words HERE.
The Hagerman Overdrive Special or ODS is Jim’s take on the venerable Dumble Overdrive Special circuit in a tube based preamp form. Hagerman recommends running this high voltage powerhouse either in front of a neutral/clean poweramp or in the effects loop of an amplifier. He does also note that the pedal can be run traditionally as a guitar pedal in line and in front of an amplifier… more on that later!
Tonally, the ODS isn’t a direct clone of the Dumble topology or another pedal, but more so Hagerman’s own take with improvements sought to not only get those Dumblesq tones shrouded in mystery but also to go beyond the spectrum to meet the demands of players seeking versatility.
“The OVERDRIVE SPECIAL is a dual 12AX7 tube pedal preamplifier designed to mimic classic Dumble ODS tones. It is not a copy or clone, but rather a completely re-thought and re-designed circuit, intended to surpass the original. The COLOR control provides equalization identical to Dumble rock mode at noon, while duplicating Robben Ford settings when minimized. A LIFT switch pulls this control out of circuit, providing a 10dB boost in gain. The DRIVE control adjusts gain to compensate for various pickups (single-coil, humbucker). The ODS switch enables the high-gain section, which utilizes my all-tube symmetric clipper circuit, offering up what I believe to be superior performance. This is followed by another tilt TONE control and output LEVEL. ”
The Hagerman ODS is a true tube powered preamp circuit meant to color and influence a clean amplified circuit, running at a full 115 volts and powered by two 12AX7 preamp tubes. Many pedals on the market claim to utilize tubes to get their warmth and tone while barely generating enough voltage to pass signal through the tube much less empower it’s valve magic… again not the case. You do need to either use the supplied 370ma AC power supply or feed it the proper power from your supply of choice.
The ODS’s control layout are fairly simple with it’s level, tone and drive while the color control acts as a sort of presence knob allowing you to bring in more top end or cut brittle or harsh highs. Hagerman mentions setting the COLOR knob at noon is identical to the ROCK setting on a Overdrive Special whereas pulling it back, hence cutting some highs takes it towards Robben Ford’s familiar tonal landscape.
In terms of the controls and the ODS preamp’s use case, I did indeed try running the pedal in the effects loop of a Guytron GT-100 amplifier as well as the input of my preamp’s which went directly to the DAW and used software to simulate speakers etc… While those methods worked, I found my most favorable results running the ODS into the front end of a Two Rock Traditional Clean configured for it’s highest headroom and at it’s cleanest setting. I positioned it at the end of my pedalboard chain, right before the front end of the Two Rock. While the recommendation might suggest otherwise, I felt this yielded the sweetest tone from the ODS and I was able to get color, gain and that familiar Dumble tonal characteristic. I’m sure the ODS works exceedingly well as recommended but this was my own personal experience. I mostly used the ODS in it’s lighter to medium gain structures and relied heavily on using the LIFT switch to add a tonal and tactile boost for the amp. I felt these settings suited the ODS in the best way as well as matching my playing style. A side note, I did not employ the ODS switch itself in any of the demo tracks as I felt they were just too fuzzy for what I was going for in this demonstration. It’s certainly not a dig but I personally didn’t need that much extra saturation from the pedal itself. If you would like to hear that ODS higher gain switch in action, Pete Thorn has a great demo showcasing the pedal as well including those elements.
In the video demo below, the Hagerman ODS was used on all the stringed instruments including the bass guitar, which was very impressive to my delight. I could see bass players using this as another voice in their preamp choices very easily. I found the ODS to be a very musical and high headroom box of tonal color, when paired with the right amp or rig I think anyone could easily find tonal nirvana!
Thanks for checking this Gearheads Feature on the Hagerman ODS. If you’d like to learn more about Hagerman Amps and FX please do check out these sites for more information.
https://www.facebook.com/HagermanTechnology
https://www.instagram.com/hagermanamplification/
Until next time Gearheads, please take a moment to Like, Subscribe & Share this Feature and I’ll see you all very soon!