Which schematic is the real/correct/original version of the Vox Tone Bender?

[LucifersTrip]

Which schematic is the real/correct/original version of the 2 knob Vox Tone Bender?



This:
http://fuzzcentral.ssguitar.com/voxbender/voxtonebenderschematic.gif

This:
http://www.schematicheaven.com/effects/vox_tonebender_fuzz.pdf

or...


thanx

[slacker]

Neither of those is correct as far as I know.

This one is though http://www.aronnelson.com/gallery/main.php/v/soulsonic-fx/Vox/Vox+V828+Tone+Bender.gif.html?g2_imageViewsIndex=1

I've got a modern reissue and that also matches the above schematic except it doesn't have the 47k resistor in paralel with the volume pot, there are pads on the board for it though.

[Electric Warrior]

The Fuzzcentral one is correct. The 8k2 resistor between ground an the attack pot should probably be 820Ω in the schematicheaven pdf. Apart from that it's correct as well. The cap values varied quite a bit.

The schematic slacker posted is a copy of the factory schematic. I haven't seen an actual unit with the 2.2k resistor yet. The 47k resistor in parallel with the volume pot is kinda rare, but some units do have it.

[LucifersTrip]

Thanx alot for all the info. I was a bit dubious about the factory schematic since the one's I've seen pictured in articles all have had 2 different transistors.

This was one good article:
http://www.stompboxes.co.uk/1966.html
The very first Vox Tone Benders did have slightly different component values but most obvious of all had an OC76 transistor in the second position within the circuit. These early Vox units  were fitted with a SFT337 and an OC76 and also had the input capacitor mounted beneath the circuit board. Models from approx 1967 still used the SFT337 but in place of the OC76 used a SFT363E and featured a top mounted input capacitor.


thanx again for the info...

[petemoore]

  I read some of the early famous users would take the FF or TB box back in to where they were made, where a room was provided with all the necessaries for re-tweeking.
  If true this would make the most famous of the early boxes also the most mysterious in terms of actual values.

[Brymus]

 I read some of the early famous users would take the FF or TB box back in to where they were made, where a room was provided with all the necessaries for re-tweeking.
  If true this would make the most famous of the early boxes also the most mysterious in terms of actual values.

OH where did you read this
I want to read that article,do you have a link ?
I read that the famous users would get access to the music store/s when the shipments of FF/TB would come in and try every single unit to get the best sounding one.
I think I read that in a link over at D.A.M.  IIRC