Nuverdrive+

A different overdrive that uses a Korg Nutube.
If you live in UK you can find them here.
Original project and schematic available here.

The only sample I could find starts at 2:15 (first version without Tone knob)

Tubeworks Real Tube 903 Modded Tone Stacks

So as most of you guys know when I'm studying for exams I tend to do a bunch of layouts when taking breaks to keep my sanity. So since I did a layout for the Tubeworks 903 I thought to myself if it's basically a tube pre-amp I thought why couldn't the tone stack be modded to that of some legendary amps. With that in mind, I modified the original layout I made with various tone stacks.

Original schematic can be found on Revolutiondeux.

Layout 1: Fender

 

Layout 2: Marshall

Layout 3: Vox

Layout 4: Hiawatt DR103

Layout 5: Sunn 1st Gen Model T

Layout 6: Orange OR120 MKII

Layout 7: Matamp GT120

Layout 8: 72 Ampeg SVT

Layout 9: Marshall Superbass

Layout 10: Dumble Overdrive Special 70's

Layout 11: Dumble Overdrive Special '97

Tubeworks Real Tube 903

JohnK had made a layout for the 903 awhile ago, and since I did a layout for the 901 i thought I'd see if I could make a smaller layout for the 903 to make it easier to put this in a 1590BB with plenty of room. I took his switch wiring to make it true bypass, and removed the additional LED to tell you that it's got power, which I feel is unnecessary. Schematic can be found on Revolutiondeux.

Tubeworks Real Tube 901

JohnK had made a layout for the 903 awhile ago, so I thought I'd give the 901 a shot. The layout should be small enough to give you plenty of room in a 1590BB. I took his switch wiring to make it true bypass, and removed the additional LED to tell you that it's got power, which I feel is unnecessary. Schematic can be found on Revolutiondeux.

The 901 has higher gain then the 903.

Frequency Central Promiscuous Girlfriend

Another tube booster/overdrive created by frequency central over at FSB, schematic.

What does it do? Well it does clean boost with the Gain set at minimum, flick on the Dirt switch and you get some nice diode clipping too. Turn up the Gain and you'e into overdrive territory with diode clipping, flick the Dirt switch off and you get even more overdrive. All with some nice tonal variations courtesy of the tonestack, typical Big Muff Pie Tonestack. You can easily tweak the tonestack to taste.

You can also try different diodes for D5-D6, keep in mind when they are engaged you will loose some output, but there should be more then enough output with them engaged. What may be a nice tweak is to change the Dirt switch to a pot so you can control how much of the signal gets clipped by the diodes.

I opted to have the power on a separate board to help avoid issues with interference with the rest of the circuit. Make sure you are rated at least 50V due to the increased voltage from the doubling at the powerboard, which gives out approximately +35V. Also, on the power board you'll notice that I have 2 connections for the heater pins of the tubes, pins 3 & 6, but you can just run 1 wire to tube 1 then have a wire connects to the pins of tube 2.

ZHBoost

Another submini tube based booster/overdrive pedal created by himister over at FSB, schematic. Make sure you are rated at least 25V due to the increased voltage from the rectifier. An additional mod you can do is replace the trimmer with a 250k pot so you can control the distortion produced by the tube on the fly externally.

 A quick note about the power. In the schematic it states that the voltage is +9VAC, not +9VDC, but if you read through the thread himister states that he used +9VDC to test it and the pedal worked fine and correctly, which is why I put the voltage as +9VDC.

Modded with asymmetrical clipping diodes to provide some more distortion, and a gain pot that controls how much the diodes are in the circuit, similar to the Germanium Giant, as well as a basic tone control.

Modded with symmetrical clipping diodes to provide some more distortion, and a gain pot that controls how much the diodes are in the circuit, similar to the Germanium Giant, as well as a basic tone control.

Same layouts as above with the change to the power section. I decided to not include an onboard charge pump as it's just as easy to add one offboard with the available charge pump layouts on the site.

Non-modded layout:

Modded Layout with Asymmetrical Diodes:

 Modded Layout with Symmetrical Diodes:

Frequency Central Red Star Drive

A real nice booster/overdrive that's basically has a submini tube that replaced the transistor create by frequency central over at DIYSB, schematic. Make sure you are rated at least 25V due to the pedal running +12V.


Version 1: Symmetrical Clipping Diodes

 Version 2: Asymmetrical Clipping Diodes

Tube-Town Effects

Here is a serie of tube effect pedals by the German Tube-Town which were requested a while back.
There aren't videos available but you can find all infos, schematics and pcbs on their website here.
(The Pepper Shredder has been discontinued but it's supposed to be a tube distortion based on the Twin Valvecaster)

Quadcaster

Four Valvecasters in series!
You can find the original schematic here.