Davoli - Tredix tremolo (1968)  [schematic]

Discussion regarding early stompbox technology: 1960-1975 Please keep discussion focused and contribute what info you have...
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Fender3D
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Post by Fender3D »

For your eyes only, today a new "position" in fuzz-a-sutra...
Now with tremolo.
Ladies and gentleman, directly from may '68, Davoli Tredix:
Tredix.jpg
Im000765.jpg
Im000776.jpg
Im000775.jpg
Im000773.jpg
Im000770.jpg
Im000768.jpg

Schematic:
Tredix.pdf
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Post by sinner »

Rockin! :thumbsup Even the name of it rolls me

Thanks bro

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Post by oswaldo23 »

saludos me gustaria hacer el tremolo pero no entiendo cual es el in y cual es el out de la parte del tremolo en el schematic.ojala me pudieran ayudar gracias

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Post by oswaldo23 »

my english is very bad , Greetings I would like to make the tremolo but do not understand what is in and what is out of the tremolo in the schematic. I need your help

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Post by Fender3D »

Tremolo is the upper schematic side, with BC109s.

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Post by Fender3D »

Just a little side note:

tremolo's transistors are not the same as in schematic:
BC109 is the current mirror
LFO's is a BC114
and the variable resistor is a BC172

Depth pot, is somewhat funky:
it measures 250K despite it's marked as 0.1M on case (100K on schem.)
I have a drawer full with old recovered parts I collected in years...
well I have 5 LESA pots (the same mounted here) marked 0.1M and all of them measure 220K-275K :shock:

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Post by Bernardduur »

Looks really cool! How's it sounds?
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Post by LucifersTrip »

thanx alot for posting that!

just wanted to check a couple simple things about the schematic before I attempt it...

the "," 's are "." 's here in the US, so all the 2,2K's and 3,3K's and 3,9k's and 8,2k's are 2.2K, 3.3k, 3.9K , 8.2k and the 0,1M bottom right is .1M = 100K ?

...and what are "k" and "kp" capacitors?

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Post by Fender3D »

Bernardduur wrote:Looks really cool! How's it sounds?
well.. it is a fuzz...
I'm not so deep into this..., but it is smooth, different from schmitt trigger fuzz...
It sounds smooth and old to my ears :)
I should try different trimmer settings 'cause those collector's 4V marked on schematic looks like a rounded value, considering the time technology involved...

Tremolo is more effective with fuzz on.
LucifersTrip wrote:...the "," 's are "." 's here in the US, so all the 2,2K's and 3,3K's and 3,9k's and 8,2k's are 2.2K, 3.3k, 3.9K , 8.2k and the 0,1M bottom right is .1M = 100K ?
yep :thumbsup
LucifersTrip wrote:...and what are "k" and "kp" capacitors?
They used elder markings k and kp instead of nF.
Electros are 5uF/6V and 5uF/25V (instead of 12V)

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Post by LucifersTrip »

sounds cool...thanx for confirming...

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Post by DrNomis »

Cool, where do you guys find all these old stompboxes?, I've seen some mentioned in the Vintage Stompbox Corner that I've never even heard of before..... :thumbsup
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Post by Fender3D »

Lol
you won't believe it was laying in a barn...

In Italy, elder musicians keep their old gear in the strangest places...

I found this
Small Head
Small Head
IM000023.JPG (70.8 KiB) Viewed 1877 times
old beauty in a similar manner...

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Post by DrNomis »

Fender3D wrote:Lol
you won't believe it was laying in a barn...

In Italy, elder musicians keep their old gear in the strangest places...

I found this
IM000023.JPG
old beauty in a similar manner...

Wow, is that an original Marshall 8 X 12 Speaker Cab?.... :thumbsup
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Post by Fender3D »

Hehe, nope
it's a rare 8 x 10" and 50W small head...

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Post by Fender3D »

1970

Sorry for double post, edit button seems to be there only when you don't need it :slap:

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Post by sinner »

Fender3D wrote:50W small head...

Guuuuuuts :mrgreen: kindly please :)

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Post by Fender3D »

I have just these in my archive...
I'll bring it on home next time I'll go rehearsing and I'll post other pics. (Maybe in another thread...)
IM000759.JPG
IM000760.JPG

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Post by sinner »

Looks sweet mate :thumbsup

Thanks a lot

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