VOX TONEBENDER MKII CLONE PROBLEMS

[eduardo_gj1@hotmail.com]

Hello, and I want to thank all the people who are here, and this wonderful page, and I hope that someone can help me, I find this DIY pedal on the Internet. And I really like the idea of building, and I'm going to buy all the components, but now I do not know why, I'll publish all the information I have, and see if anyone can help me put it to work

first the schematic



second the pcb


and now some information about this pbc that I found.I could not get the oc75 germanium transistors, but I got the ac125 germanium transistors (1 and 2 are 80-90 Hfe and transistor 3= 90-100hFE),  and the 20k trimpot i try to biasing but is not make too much difference is always between 8 when is in min and 9 full transistor 3 in C- leg

i use a 2-pole foot switch and you can see all the connections in the pbc, i  try connecting the footswitch but it did not work, then try a 3pdt footswitch, and it did not work either,

if someone need more information please ask and i give all i have about the pedal so i can make this work

i hope someone can help me

[Rob Strand]

Set TR1 so the pot is at 8.2k (roughly half way).

Reduce R4 (100k) until you get about 1.5V to 2V between the collector of Q3 and the -9V rail.   Try 47k or 68k.   It is better to measure like this.   Measuring the collector voltage is inaccurate because the battery voltage may vary.

You should also adjust R2 so you get about 0.5V between Q1'a collector and the-9V rail.

Those voltages should be a good start but I recommend tweaking R2 and R4 to get the best tone.