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Old 27th June 2012, 08:21 PM   #3551
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sounds intersting , is there a schm or a thead about it here ?
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Old 27th June 2012, 08:24 PM   #3552
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nope ............. and many

visit us these dayz in da pub and remind me to draw it

I'm having PITA lately drawing schm , because my trusty scanner is refusing to work under 7-th Schweindoze
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Old 27th June 2012, 08:38 PM   #3553
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i have some lundhal cascode CCS here , best is to use it in place of the 15V reg on the upper jfet or down in place of the -15 reg ??

gime some works for tomorrow ,,,
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Old 27th June 2012, 09:14 PM   #3554
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Quote:
Originally Posted by juanitox View Post
...... lundhal cascode CCS ....
??!?
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Old 27th June 2012, 09:17 PM   #3555
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some of these CCS Click the image to open in full size.

( DN2540N5 and IXYS IXTP01N100D depletion mode MOSFET)

is it good for the upper JFEt after or in place of the Regulator?
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Old 27th June 2012, 09:30 PM   #3556
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naah

that's hi-voltage thingie ...... no need for that

whatever - you need somewhat elevated B+ (say 20-25V) ,BC546 as cascode above upper jfer placed at 12-15V ;

you can leave lower Jfet as is , or replace it with Widlar CCS , with multipot for setting

I told ya - I'm lazy for puter drawing , and I need new scanner

whatever - main obstacle is that I have some things to finish tonight and tomorrow ..... going to see my Yoda (Manu) early morning Friday
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Old 28th June 2012, 05:46 PM   #3557
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take your time l'ami ! today i just put a 40ohm R before the 15000uf Cap to make a RC filter no change , then swapp the output series Kiwame 240ohm Resistor what makes a big change , better bass , dynamics , everything pops.. ( no oscillation with a 20K / 40K square wave)

i keep the 240 kiwame input ( for the moment!)
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Old 28th June 2012, 06:02 PM   #3558
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you can toss that output resistor

Pa put it there for sissies

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Old 3rd July 2012, 05:33 PM   #3559
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Default Fitting Obligattos to B1

I have been asked how I fitted the Obligatto 10uFs into the B1.

I used a clone of the full Pass B1 build, which uses a huge PCB when compared to the Salas B1 and DCB1 boards.

The PCB is big enough to accomodate the huge Obligattos with the leads looped under the board and connected underneath the board on the copper track side. I also fitted two cap clips to hold the big caps in place.


If you want to do this mod. to the smaller Salas boards you will need to short out the output caps on-board and fit the SODA CANS away from the board.
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Last edited by KatieandDad; 3rd July 2012 at 05:38 PM.
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Old 3rd July 2012, 06:48 PM   #3560
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Default B1 with 240 ohm???

Quote:
Originally Posted by juanitox View Post
take your time l'ami ! today i just put a 40ohm R before the 15000uf Cap to make a RC filter no change , then swapp the output series Kiwame 240ohm Resistor what makes a big change , better bass , dynamics , everything pops.. ( no oscillation with a 20K / 40K square wave)

i keep the 240 kiwame input ( for the moment!)
Hi Juanitox!!

This turn on the B1 seems interresting... but after my schematic and the one I see on Passdiy.com there are no 240 ohm resistor neither on the output or on the input??
I wonder if you mean the R204 that is 1Kohm - that is the one you are changing with the Kiwave-resistor?

Now I have moved my BIG Obligato10uf to the SIT so there are no output cap and maybe a new Kiwave on the input AND output of the B1 can keep the sound even more touchable?

Is the sound you get worth a try Juanitox???

Best from a guy out in the open NorthSea

Olav
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