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    Handwired All-Tube Guitar Amplifiers by Rick Campbell
   
Proudly made in Oregon USA since 1984
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RICK-TONE 'TREM-O-DRIVE' UNIT

Description

The Trem-O-Drive is a tube-based effect for use with electric guitar. It combines tremolo and overdrive effects into a single unit. A 12AX7 dual triode tube boosts the guitar signal for hotter input to an amplifier and adds amplitude modulation to the signal to produce the tremolo effect. Controls consist of a power on/off switch, a bypass pushbutton, a tremolo in/out pushbutton, and control knobs for "drive", "depth", and "speed". There were some minor circuit variations between individual units. The schematic available here is a representative example of the basic circuit.

Electrical Diagrams

Pictures

I don't have any of the original units (from the 1980s) to take pictures of. The unit shown here was assembled in 2007 from mostly non-vintage parts. The original units were housed in a slightly smaller enclosure, without the fake woodgrain finish, and used different styles of knobs, jacks, and switches.





If you have one of these units, and have pictures of it that you're willing to share, I'd appreciate it if you could e-mail them to me.

Audio Samples

Here are some examples of how the Trem-O-Drive sounds.

Tremolo Examples:

  • clip-1 - Played once without tremolo, then once with.
  • clip-2 - Played twice without tremolo, then twice with.
  • clip-3 - Played once without tremolo, then once with.

Overdrive Examples:

  • clip-4 - Played once without overdrive, then once with.
  • clip-5 - Played once without overdrive, then once with.

Tremolo And Overdrive Both Active At The Same Time:

  • clip-6 - Drive set at about 60% and tremolo depth set at maximum.

If you have one of these units, and have recordings of it that you're willing to share in any digital format, I'd appreciate it if you could e-mail them to me.

Elsewhere On the 'Net

Here are some links to some discussion threads about the Trem-O-Drive on the AX84 forum:

And check out the pictures of the cool purple Trem-O-Drive by koko76 from the AX84 forum:

If you know of another discussion thread or web page about the Trem-O-Drive, I'd appreciate it if you could e-mail a link to me.


 
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