sontec 1 RU build thread

[Gold]

I got the OKW knobs today. They seem like they are of high quality and comparable to Elma.

I wish the pointer on the pointer ring was a little longer. They also don't offer a collet knob in gray with a line for a 1/4" shaft but you can get a cap with a line in gray. Close enough.

 

[therecordingart]

Has anyone tried building this with rotary switches?

 

[khstudio]

[quote author="Gold"]I got the OKW knobs today. They seem like they are of high quality and comparable to Elma.

I wish the pointer on the pointer ring was a little longer. They also don't offer a collet knob in gray with a line for a 1/4" shaft but you can get a cap with a line in gray. Close enough.[/quote]

I'm about to order from them too... looks like good stuff. :green:

What were the shaft sizes you got?
I ask because you mentioned 1/4 in & I thought the larger ones were 6mm.

Thanks,
Kevin

 

[Gold]

The knobs I ordered aren't for this project. I haven't started on this yet. I ordered for 1/4" shafts. Most knob diameters come in 4mm, 6mm, 1/8" and 1/4". Some sizes have more limited options. 6mm always has all the options.

I haven't received my pots yet anyway.

 

[TornadoTed]

[quote author="SALSA"][quote author="TornadoTed"]I've decided to go with the Forrsell opamps instead of the OPA604.

Which ones should I use for IC6 and IC8?[/quote]

Cheapest solution if you want to go Forssell : DLR-1 for IC8 and JFET-992 for IC6

Cheers,

Mike[/quote]

Which parts, if any do I need to leave out if I use the Forssell DLR-1 and JFET-992?

Anyone know where I can get the 12pf Silver Micas. I have tried Mouser, DigiKey, Banzai, RS and Farnell?

 

[user 10827]

Toronto Ted,

don't need to leave any parts our for the line receiver and 993.

you can get the 12pf silver mica on ebay....

best

Pete

 

[crisotop]

Igor seiad 10p is perfectly fine for those, at least i use them....

cheers
christoph

 

[TornadoTed]

I just found the 12pf on eBay, many thanks.

I double checked my list and I have everything now except the 4.7uf Poly

What are you guys using there?

Also it says use 4k7 resistors for more boost/cut on the bottom side of the board.

I have a Purusha case with 12dB of cut/boost. Do I need to use those resistors to roughly match the value on the case?

Many apologies if i am asking stupid questions, this is my first solo build and I only have a very basic knowledge of electronics!

 

[crisotop]

I bought this massive Wima from Banzai...

I'm not sure about the resistor values either, would be handy to know which value comes closest to +/-12dB...

hth, christoph

 

[bearblock]

re. the 4.7uf poly - a similar Wima can be found at Farnell, order code 1006056. that's what I used.

 

[khstudio]

[quote author="crisotop"]

I'm not sure about the resistor values either, would be handy to know which value comes closest to +/-12dB...

hth, christoph[/quote]

uh oh... I'm using the 12dB scale & just loaded the 7.5's :?:

I'd like to know too before I mount the Pots.

 

[Igor]

Hi, 4k7 will give exactly +/-12db.

 

[khstudio]

[quote author="Igor"]Hi, 4k7 will give exactly +/-12db.[/quote]

Thanks Igor. :thumb:

Can I ask which way you prefer it?
I see that you also used Tat's case with the 12dB scale... did you set yours up with the 4.7's?

I may have some de-soldering to do today. :sad:

 

[king-rb]

yehaaa...

i finished the sonntec!!! and it sound extreme cool! today i will check the eq on a mastering session.
...but i think i have to de solder the 7k5 and put 4k7 in for 12 db boost/cut..

 

[Igor]

Hi, yes, I using 4k7 or 5k6 (which at stock at the moment).
If boost/cut less then 11.5 db with (4.7...5.6)k, just check
if filter's caps - 4u7, 3n3, 0.47u, 330p, 0.15u, 100p have 5%
tolerance with cap' meter.

 

[nielsk]

Has anyone had luck getting the pots? I inquired with Alphastat, they email me every 4 months or so in German, suffice it to say I have not been able to place an order yet

 

[khstudio]

[quote author="nielsk"]Has anyone had luck getting the pots? I inquired with Alphastat, they email me every 4 months or so in German, suffice it to say I have not been able to place an order yet[/quote]

I had a feeling they would be hard to get (when I placed the order for the PCB's) which is the reason I paid the extra for the KIT. :wink:

It was a lot of money for us USA folks but worth it for less headache.

Check with Igor about a POT & Switch KIT. he may still have some.

 

[TornadoTed]

What happens at the spot on the PCB marked FB with a resistor outline with 0 in it?

A jumper?

Since I posted this I got the pots through the post from Igor. There are,

1x 270 - XS8776 - 0826 with 5 pins
3x 270 - XS8787 - 0827 with 3 pins

I'm confused as to why I have different 5k pots rather than 4 the same.

Does the 1x 270 - XS8776 - 0826 have to go in a certain position?

 

[khstudio]

I received my Pots too. :green:

But I can't answer your question.


Thanks Igor!!! :thumb:
:guinness: :sam: :guinness: :sam: :guinness:

 

[crisotop]

If I remember it right the five-pin version is the 'Q' Pot for the low frequency band - will be back home in a couple of hours and can double check.

hth, christoph