E.W.S Tri-Logic II Bass Preamp  [traced]

General documentation, gut shot, schematic links, ongoing circuit tracing, deep thoughts ... all about boutique stompboxes.

E.W.S Tri-Logic II Bass Preamp

Postby chicago_mike » 21 Feb 2012, 16:05

lots of things have happened. Good, and bad...

Here is an offer of peace...
You do not have the required permissions to view the files attached to this post.
Skyline FX 2013

For this message the author chicago_mike has received thanks: 9
99.5 (27 May 2014, 01:00), bluetube (13 Jun 2012, 04:23), george giblet (02 Dec 2018, 21:12), IvIark (02 Jun 2012, 19:24), modman (11 May 2012, 11:44), Nocentelli (21 Feb 2012, 18:46), pedalgrinder (07 Mar 2012, 10:44), tp801 (22 Feb 2012, 10:11), x-tn (12 Apr 2012, 00:42)
User avatar
chicago_mike
Tube Twister
 
Posts: 1760
Joined: 03 Jul 2008, 05:38
Has thanked: 23 times
Have thanks: 301 times

Re: E.W.S Tri-Logic II Bass Preamp

Postby chicago_mike » 21 Feb 2012, 18:14

more
You do not have the required permissions to view the files attached to this post.
Skyline FX 2013

For this message the author chicago_mike has received thanks: 3
bluetube (13 Jun 2012, 04:23), modman (11 May 2012, 11:44), pedalgrinder (07 Mar 2012, 10:44)
User avatar
chicago_mike
Tube Twister
 
Posts: 1760
Joined: 03 Jul 2008, 05:38
Has thanked: 23 times
Have thanks: 301 times

Re: E.W.S Tri-Logic II Bass Preamp

Postby chicago_mike » 21 Feb 2012, 18:17

more
You do not have the required permissions to view the files attached to this post.
Skyline FX 2013

For this message the author chicago_mike has received thanks: 3
bluetube (13 Jun 2012, 04:24), modman (11 May 2012, 11:44), pedalgrinder (07 Mar 2012, 10:44)
User avatar
chicago_mike
Tube Twister
 
Posts: 1760
Joined: 03 Jul 2008, 05:38
Has thanked: 23 times
Have thanks: 301 times

Re: E.W.S Tri-Logic II Bass Preamp

Postby chicago_mike » 21 Feb 2012, 18:19

more to come
You do not have the required permissions to view the files attached to this post.
Skyline FX 2013

For this message the author chicago_mike has received thanks: 2
modman (11 May 2012, 11:44), pedalgrinder (07 Mar 2012, 10:45)
User avatar
chicago_mike
Tube Twister
 
Posts: 1760
Joined: 03 Jul 2008, 05:38
Has thanked: 23 times
Have thanks: 301 times

Re: E.W.S Tri-Logic II Bass Preamp

Postby chicago_mike » 21 Feb 2012, 18:22

I do not know how close or far these are ...

Schematic wise.

Mid shift on pedal is 400hz low , 800hz high
You do not have the required permissions to view the files attached to this post.
Skyline FX 2013
User avatar
chicago_mike
Tube Twister
 
Posts: 1760
Joined: 03 Jul 2008, 05:38
Has thanked: 23 times
Have thanks: 301 times

Re: E.W.S Tri-Logic II Bass Preamp

Postby quaternotetriplet » 22 Feb 2012, 00:34

:applause: :slap: mad props to you my friend.

For this message the author quaternotetriplet has received thanks:
chicago_mike (11 Mar 2012, 02:09)
quaternotetriplet
Resistor Ronker
 
Posts: 377
Joined: 19 Nov 2008, 14:37
Has thanked: 10 times
Have thanks: 4 times

Re: E.W.S Tri-Logic II Bass Preamp

Postby quaternotetriplet » 22 Feb 2012, 00:39

chicago_mike wrote:I do not know how close or far these are ...

Schematic wise.

Mid shift on pedal is 400hz low , 800hz high

i dont see those switch on the schem? :horsey:
quaternotetriplet
Resistor Ronker
 
Posts: 377
Joined: 19 Nov 2008, 14:37
Has thanked: 10 times
Have thanks: 4 times

Re: E.W.S Tri-Logic II Bass Preamp

Postby chicago_mike » 22 Feb 2012, 03:49

Those scematics are just ones I found over the net.

I don't have the pedal anymore, but I do have more pics I can post.
Skyline FX 2013
User avatar
chicago_mike
Tube Twister
 
Posts: 1760
Joined: 03 Jul 2008, 05:38
Has thanked: 23 times
Have thanks: 301 times

Re: E.W.S Tri-Logic II Bass Preamp

Postby quaternotetriplet » 23 Feb 2012, 10:54

i hope someone can trace this.. this one is a nice preamp.
quaternotetriplet
Resistor Ronker
 
Posts: 377
Joined: 19 Nov 2008, 14:37
Has thanked: 10 times
Have thanks: 4 times

Re: E.W.S Tri-Logic II Bass Preamp

Postby pedalgrinder » 07 Mar 2012, 10:48

so i can see ok op amp more than likely dual one bs170 did you write down the cap values? then all we have to do is follow the colour code for the resistors and could maybe make a black and white pic out of a pic of the trace side of the board. Just some thoughts i had with it. More pics please Chicago Mike i reckon this one is possibly traceable. thanks
What's the best thing about fat chicks and scooters? There both fun to ride around until your mates find out!

For this message the author pedalgrinder has received thanks:
chicago_mike (11 Mar 2012, 02:09)
User avatar
pedalgrinder
Cap Cooler
 
Posts: 553
Joined: 29 Aug 2011, 07:05
Location: South Australia Adelaide
Has thanked: 203 times
Have thanks: 154 times

Re: E.W.S Tri-Logic II Bass Preamp

Postby pedalgrinder » 07 Mar 2012, 10:58

the caps on the switch need to be identified also did you catch what they were by chance?
What's the best thing about fat chicks and scooters? There both fun to ride around until your mates find out!
User avatar
pedalgrinder
Cap Cooler
 
Posts: 553
Joined: 29 Aug 2011, 07:05
Location: South Australia Adelaide
Has thanked: 203 times
Have thanks: 154 times

Re: E.W.S Tri-Logic II Bass Preamp

Postby chicago_mike » 08 Mar 2012, 07:09

I'll see what more pics I have.

The midrange frequencies are advertised as 400 and 800hz

So, if this follows the 3-band active baxandall, a little math :scratch: :hmmm: :?: :slap: might tell us what values.

But I think they were 015 and 033.. :whappen:

Wish I still had this pedal.



EDIT:

One of the MID caps is a .047

Oh, where do I get such pots and blue caps???
Skyline FX 2013
User avatar
chicago_mike
Tube Twister
 
Posts: 1760
Joined: 03 Jul 2008, 05:38
Has thanked: 23 times
Have thanks: 301 times

Re: E.W.S Tri-Logic II Bass Preamp

Postby pedalgrinder » 08 Mar 2012, 13:34

as long as you know the values any pot will be fine the numbers on the blue caps are no different to the numbering scheme of green caps and i gaurantee you would sound no different. so yeah all we need is purely the numbers on the caps then any other caps can be used without making the pedal sound bad in anyway. Sure you could sit here and argue oh this cap sounds slightly bettter than that one. I say shove that theory up your arse. i've used green caps always they sound fine to my ears.
What's the best thing about fat chicks and scooters? There both fun to ride around until your mates find out!
User avatar
pedalgrinder
Cap Cooler
 
Posts: 553
Joined: 29 Aug 2011, 07:05
Location: South Australia Adelaide
Has thanked: 203 times
Have thanks: 154 times

Re: E.W.S Tri-Logic II Bass Preamp

Postby chicago_mike » 08 Mar 2012, 20:20

Oh, I'm not concerned about that. I like the fact they are small. :D

I just wonder where I can purchase the smaller sized pots and those little blue caps. I dont see easily see them around.

I will be uploading the rest of the pics I have today. Also, I'll make some trace images b&w and also try layering.

Whats cool is this is also the same circuit used in the Xotic series of basses.
Skyline FX 2013
User avatar
chicago_mike
Tube Twister
 
Posts: 1760
Joined: 03 Jul 2008, 05:38
Has thanked: 23 times
Have thanks: 301 times

Re: E.W.S Tri-Logic II Bass Preamp

Postby pedalgrinder » 09 Mar 2012, 22:07

how did you get your hands on the pedal in the first place is there any chance you could grab it back just to write down the cap values or pot values by chance? Tracing the circuit shouldn't be over difficult but cap values certainly make a difference and i really couldn't be bothered sitting there with a calculator hoping to get the maths correct. Thought it was worth a shot to ask.
What's the best thing about fat chicks and scooters? There both fun to ride around until your mates find out!
User avatar
pedalgrinder
Cap Cooler
 
Posts: 553
Joined: 29 Aug 2011, 07:05
Location: South Australia Adelaide
Has thanked: 203 times
Have thanks: 154 times

Re: E.W.S Tri-Logic II Bass Preamp

Postby chicago_mike » 10 Mar 2012, 03:25

I sold it like 9 months ago. :(

I do have more pictures I have to post. The pots are 50KB. One of the caps on the midrange switch is a 473 (047). So we only have that and maybe the tantalum to get?

I should have the rest of the pics here later tonight. :)
Skyline FX 2013
User avatar
chicago_mike
Tube Twister
 
Posts: 1760
Joined: 03 Jul 2008, 05:38
Has thanked: 23 times
Have thanks: 301 times

Re: E.W.S Tri-Logic II Bass Preamp

Postby bs_ane » 10 Mar 2012, 20:27

Has anyone schematic from this preamp??
bs_ane
 
Posts: 11
Joined: 03 Mar 2012, 13:04
Has thanked: 1 time
Have thanks: 1 time

Re: E.W.S Tri-Logic II Bass Preamp

Postby chicago_mike » 11 Mar 2012, 01:46

That's what we are working on. :D

I installed windows 8 last night and forgot to edit the rest of my pics of this preamp. I'll post everything I got in a few.

The preamp is rather simple, but very musical.
Skyline FX 2013
User avatar
chicago_mike
Tube Twister
 
Posts: 1760
Joined: 03 Jul 2008, 05:38
Has thanked: 23 times
Have thanks: 301 times

Re: E.W.S Tri-Logic II Bass Preamp

Postby chicago_mike » 11 Mar 2012, 02:52

:popcorn:
You do not have the required permissions to view the files attached to this post.
Skyline FX 2013

For this message the author chicago_mike has received thanks: 3
bluetube (13 Jun 2012, 04:24), modman (11 May 2012, 11:45), pedalgrinder (11 Mar 2012, 22:20)
User avatar
chicago_mike
Tube Twister
 
Posts: 1760
Joined: 03 Jul 2008, 05:38
Has thanked: 23 times
Have thanks: 301 times

Re: E.W.S Tri-Logic II Bass Preamp

Postby chicago_mike » 11 Mar 2012, 03:09

:popcorn:
You do not have the required permissions to view the files attached to this post.
Skyline FX 2013

For this message the author chicago_mike has received thanks: 3
bluetube (13 Jun 2012, 04:25), modman (11 May 2012, 11:45), pedalgrinder (11 Mar 2012, 22:21)
User avatar
chicago_mike
Tube Twister
 
Posts: 1760
Joined: 03 Jul 2008, 05:38
Has thanked: 23 times
Have thanks: 301 times

Next

Return to Boutique Stompboxes dissected...

Who is online

Users browsing this forum: cbriere, fuzzbunny, Google [Bot] and 22 guests