Fender Blender no tone change, no tone boost

mitzrecords · August 22, 2011, 08:02:38 PM

hello, thanx for this great forum always!

ive been trying to figure out why my fenderblender clone is not working well,

I built Fender Blender clone from fuzz central
http://fuzzcentral.ssguitar.com/blender.php

However, only sustain and blend knobs seem to respond, and volume and tone knobs doesnt seem to work, what i mean is, if i turn either volume or tone knobs, it doesnt change anything,

also, tone boost switch doesnt seem to effect anything,

voltages on transistors are

Q1 E-0.15 B-0.68 C-4.56
Q2 E-4.02 B-4.56 C-9.11
Q3 E-3.07 B-3.36 C-5.98
Q4 E-0.58 B-1.17 C-2.01
Q5 E-0.03 B-0.55 C-8.71

ive been trying to debug this for 2 weeks and any advice would be appreciate it!!!

mitzrecords · August 22, 2011, 08:31:45 PM

is it around Q5 since level and tone pots are around there?

mitzrecords · August 22, 2011, 10:07:38 PM

any advice would be appreciated, its been driving me nuts for last 2 weeks!

deadastronaut · August 22, 2011, 10:08:44 PM

are you sure you've wired the pots correctly....just a thought..

mitzrecords · August 22, 2011, 10:11:50 PM

im gonna triple check now, thanx for reply!

mitzrecords · August 22, 2011, 10:19:17 PM

they seem right, hmmmmmm i dont know what else to do,

deadastronaut · August 22, 2011, 10:20:38 PM

electrolytic caps they in the right way?....

R.G. · August 22, 2011, 10:26:42 PM

Transistor voltages look OK-ish.

It almost has to be miswiring, solder issue, or part orientation.

Does S1 do anything?

mitzrecords · August 22, 2011, 10:49:01 PM

hello, thanx for replies,

i just triple checked, orientations, they are good as well as diodes and transistors,

ive done re-solder for cold joint etc but im gonna try again tonight, thanx for replies!

mitzrecords · August 22, 2011, 10:50:04 PM

Quote from: R.G. on August 22, 2011, 10:26:42 PM
Transistor voltages look OK-ish.

It almost has to be miswiring, solder issue, or part orientation.

Does S1 do anything?

S1 doesnt do anything at all, it doesnt make even make a noise,

R.G. · August 22, 2011, 11:54:05 PM

I'd say it's audio probe time.

mitzrecords · August 23, 2011, 10:55:00 AM

hello, i was just trying to resolder everything and broke diodes

do you know what the replacement diodes for 1n34a in this circuit? i cant seem to find locally

thanx!

mitzrecords · August 23, 2011, 11:02:19 AM

does 1n4148 work? i can get it here in montreal if it works

R.G. · August 23, 2011, 01:09:17 PM

Quote from: mitzrecords on August 23, 2011, 11:02:19 AM
does 1n4148 work? i can get it here in montreal if it works

They're not perfect, but they will surely work better than no diode at all while you wait for the perfect diodes to arrive.

mitzrecords · August 23, 2011, 05:56:17 PM

thank you so much everything working!

deadastronaut · August 23, 2011, 06:11:15 PM

R.G. · August 23, 2011, 06:36:03 PM

Quote from: mitzrecords on August 23, 2011, 05:56:17 PM
thank you so much everything working!

Hey! Great! Good work.

What was the problem? (it helps me guess at problems when I find out what things really were)

mitzrecords · August 23, 2011, 07:21:21 PM

i think it was just bad soldering jobs, i dont know exactly where, since i resoldered around Q5 and Q3 again so

anyways, thank you so much! i learned lots!

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Fender Blender no tone change, no tone boost