The Thunderdrive Deluxe

Adjusting volume control and gain controls provides a wide variety of tones in spite of it's simple construction. The Turbo switch provides an additional boost in volume and less internally generated distortion. The pre-painted black enclosure, red control knobs and red LED indicator give the Thunderdrive Deluxe an understated attractive finish. It is capable of overdriving the preamp section of your guitar amp or adding it's own layer of distortion at lower volume. The current draw of this pedal is very low at 1.3 milliamps, allowing for long battery life.

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Questions and Answers
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Hi, In the instructions you show a 2n5088 Tran. In the schematic it shows a MPSA18 Also in one of the pics in the instructions the Trans is labeled MPSA18. Which Transistor does this effect use? Thanks!
Answers (1)
MichaelT
Staff Member
May 30th, 2018
The transistor for this kit is the 2N5088. The old one has been replaced due to availability.
Verified Answer
Hello, I would like to eliminate the 9v battery connector as I always want to run the pedal via the DC Power Jack Add. Can I just connect the Switch Lug of the DC Jack to the Input Jack in the same location the (-) side of the 9v battery Connector was attached?
Answers (2)
MichaelT
Staff Member
August 3rd, 2018
There's no need to use the switch lug if you don't plan on ever using a battery. You don't need to solder the battery connector at all in that case but you can always put it in as a backup option with no battery installed and the pedal will work just the same with a power supply.
Verified Answer
Anonymous
August 7th, 2018
I never use a battery. My pedal board is all with external DC power supply and never use battery. I just installed the external DC external socket as per the instructions but directly in place of the battery connector. Works perfectly.
The MPSA18 has a very low input impedance for guitar. When the distortion knob is all the way up(the variable 250k that's in series with the base is out of the circuit) and the diodes are switched out, isn't it a clean sound that really suffers from treble loss? Thanks
Answers (1)
MichaelT
Staff Member
January 10th, 2019
Thanks, we'll look into it!
Verified Answer
I've fully built the pedal using the instructions and all the wiring is correct. The problem is, when I plug it in to use it, the volume cuts down severely. I can hear the effect, but when it is on, the volume goes way down. Do you know why this is happening? Thanks
Answers (1)
MichaelT
Staff Member
May 13th, 2019
Check out the troubleshooting guide here: https://www.modkitsdiy.com/sites/modkitsdiy.com/files/media_files/thunderdrive_deluxe_troubleshooting_supplement.pdf Also feel free to contact us at info@modkitsdiy.com and we can assist with trying to figure out what might be going on.
Verified Answer
Nice kit. Built in about an hour (I'm experienced), although I did a lot of wiring before mounting things in the box, which made life a lot easier. Now my question: I get a nice boost but no distortion (except from the amp's tubes), so it is really acting more like your Piledriver pedal. I've maxed the distortion knob and get a boost but no discernible distortion. I can live with it but I'm curious. Thanks.
Answers (1)
MichaelT
Staff Member
June 17th, 2019
The Turbo switch lifts the clipping diodes to give a cleanish boost. With the diodes switched on it should be able to go from a slight distortion to hard clipping. Give us a shout at infor@modkitsdiy.com if that's not the case and we'll help you get it figured out!
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