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DIY Stompboxes => Building your own stompbox => Topic started by: drewl on January 29, 2009, 11:54:49 AM

Title: SuperBeatle distortion/Fuzz Face
Post by: drewl on January 29, 2009, 11:54:49 AM
So, anybody ever build the distortion circuit that's in a Thomas Vox Super Beatle?
I've fixed several, and will be tuning one up for a friend next week so I'll have to double check which transistors are in it.
As you know, it's basically an NPN Fuzz Face, and when working properly sound really mean.
I'd insert the schem if I could figure it out. But it uses a 20v supply that's knocked down to 10v with a 4.7K so it will work with a 9v.
There's no gain or volume pots but the fixed resistors are the usual suspects 1k/10uf on the emitter of Q2 and a 470K output resistor that these two could have the usual pots installed.




Title: Re: SuperBeatle distortion/Fuzz Face
Post by: R.G. on January 29, 2009, 12:30:41 PM
That's one of my favorite amps. It's a Vox Distortion Booster built in to the amp as I remember.

I seem to remember one variant working on +1.7V. I'll have to go look at my amp schemos.
Title: Re: SuperBeatle distortion/Fuzz Face
Post by: drewl on January 29, 2009, 01:03:26 PM
Well you are the man!
How long has your Thomas Vox page been up?
As long as I can remember!
I owe you several drinks!
Title: Re: SuperBeatle distortion/Fuzz Face
Post by: Sir H C on January 29, 2009, 02:31:59 PM
The series 90 has the fuzz with a fuzz knob.