Baltimore

Racking Spectra Sonics 101
« Reply #120 on: August 26, 2008, 09:03:18 PM »
assuming you have your 10k resistor between the pins labeled "signal in" and "signal out" then i believe it is wired correctly.


3nity

Racking Spectra Sonics 101
« Reply #121 on: August 26, 2008, 09:24:35 PM »
Thanks Baltimore.

now if you look at the schematic....Between the 2N4248 and 2N5366 theres a capacitor...4.7uf/35V is that polarized or not...if yes negative goes to ground??

I lifted fromt the pcb and the card dont smoke anymore!!!! :green:
Life is a path, death the destination.

3nity

Racking Spectra Sonics 101
« Reply #122 on: August 27, 2008, 04:41:18 PM »
anyone?
Life is a path, death the destination.

Animatic

Racking Spectra Sonics 101
« Reply #123 on: August 28, 2008, 01:38:52 AM »
Well it SEEMS to be creating some relative or maybe virtual ground vs 24v power.
In many schematics polarized caps have a curve and a straight line.
and non-polarize is just two straight lines. As show here.
But I am not familiar with the standard of this era.

It is also not on the 1965 drawing. So maybe you can try it with it out.
Of course looking at what was on the board to begin with is a good hint.
Go with what ya know and work with what ya got.
Then build more.

3nity

Racking Spectra Sonics 101
« Reply #124 on: August 28, 2008, 04:53:40 PM »
I did tried a 25uf/25V and its working fine but it has some warmth...altough almost hard to tell but it was there...gonna try a bigger voltage one....
Life is a path, death the destination.

3nity

Racking Spectra Sonics 101
« Reply #125 on: August 31, 2008, 10:45:22 PM »
I got one of the cards working on theory....but i dont have sound with a mic plugged.... altough for a moment i forgot to unplugged the preamp from my headphones amp and i heard the 1k  wave coming from my Generator...hum??

One step at a time! :thumb:
Life is a path, death the destination.

3nity

Racking Spectra Sonics 101
« Reply #126 on: September 01, 2008, 01:06:04 PM »
cool i got it! i got 1 channel working!!!
Everything was fine but i forgot to wire XLR pin 1 to OEP.

Cool!!!


I think i;ll have to remove the foroidal from the rack cuz i have some RF.

 :green:  :thumb:
Life is a path, death the destination.

Animatic

Racking Spectra Sonics 101
« Reply #127 on: September 01, 2008, 09:33:28 PM »
mereveaux c'est bien!

Toroidals do seem to make RF,
maybe a Cinimag in Mu metal can etc?
Go with what ya know and work with what ya got.
Then build more.

Re: Racking Spectra Sonics 101
« Reply #128 on: February 02, 2009, 01:05:12 PM »
I've noticed it's been awhile since anyone has posted on this site. I've got a pair of 110 cards that I want to rack up. I'm going to buy JLM audio power supply and go between, but I have no idea on what transformers to buy. Does anyone have suggestions for transformers that they have used? I of course need the 600Ohm 1:1 or 1:2. THANKS!

3nity

Re: Racking Spectra Sonics 101
« Reply #129 on: February 02, 2009, 11:07:11 PM »
I'm not sure but they used triad on input....some of them used Jensen too...
Right now i'm using Jensen 600:600.
Life is a path, death the destination.


Re: Racking Spectra Sonics 101
« Reply #130 on: February 03, 2009, 02:43:24 AM »
Anyone use a T66 trasnformer ? there in a black and look a lot like a Triad HS66 , but the windings seem differentns
« Last Edit: January 31, 2010, 01:09:46 AM by electrochronic »
curiousaudioparts at  gmail  dot  com
https://sites.google.com/site/diypartsstore/

rattleyour

Re: Racking Spectra Sonics 101
« Reply #131 on: February 03, 2009, 03:16:40 AM »
I have four 110s racked up, we used Cinemags on input-- CMMI-2C.

For output I used some old iron that folks here at the lab helped identify as (probably) stancor.

Re: Racking Spectra Sonics 101
« Reply #132 on: February 03, 2009, 02:36:06 PM »
Thanks for the help on the Xfrs. I was just given 2 Reichenbach RE 11SSP-6M. I think they're similar to Jensen, but I'll have to put them on a scope and see what they read. I think they're gonna be 600:600. I found a set of Triad A-67J ...but they're in Vietnam...not sure how I feel about that transaction. I'll be sure to post some picks when I get them racked.
Doug J.

goldenGeek

Re: Racking Spectra Sonics 101
« Reply #133 on: February 09, 2009, 05:38:00 AM »
I just finished racking a SS101 and it seems to be working fine finally. But I stubled upon something that probably is like it should be, but I though I`d ask anyway. Is it correct to connect pin E and F (signal input - and signal output - ) and then connect it to ground? It was the only way I could get sound out of it. The weird part is that if I grounded this at my star gound to the back of the chassis I got a ground hum. If I grounded this anywhere else closer to the front panel the hum was gone. Why did this happen do yiou think?

3nity

Re: Racking Spectra Sonics 101
« Reply #134 on: February 09, 2009, 09:44:20 AM »
you went unbalanced out or transformer balanced?
E, F and C are 0V, ground reference.
i used F as reference for input transformer, E for 24V reference and C for output transformer reference.

Matta gently posted a ground scheme for this board....they go from certain points straight to star ground.....
Life is a path, death the destination.

Re: Racking Spectra Sonics 101
« Reply #135 on: March 20, 2009, 08:12:20 PM »
Hey now.  Just wanted to extend a big thank you to all ya'll on this thread.  Just finished racking up a 110 card in a case from some old data network equipment, with a jlm power supply run off a wall wart.  Sounds fantastic, quiet, and BIG.  Would never have even known a thing about any of this stuff without this forum. Props.

bw

3nity

Re: Racking Spectra Sonics 101
« Reply #136 on: October 13, 2009, 09:04:51 AM »
Just to hear what i sounds like i wired the input unbalanced and i'm amazed at how good it sounds..
It sounds louder first thing and i think its not dark like with any 600:600 input.
To my ears it sounds more open and coloured...first real tests....
Life is a path, death the destination.

Re: Racking Spectra Sonics 101
« Reply #137 on: January 07, 2010, 03:27:47 AM »
So, instead of the dual 1k log pad in front of the input transformer, could one use the 600-ohm attenuator that Hairball sells, or am I misunderstanding the affect that the attenuator would have on the input impedance?  I know its more expensive than the the dual-pot, but I like the curve of that attenuator in both the 1176 and the VP26.  It covers the ground evenly, so to speak. 





ben

bongolijus

Re: Racking Spectra Sonics 101
« Reply #138 on: April 04, 2010, 09:57:23 AM »
Can someone confirm what ratio transformers needed for the 110A model? Are they 150/600:2k5 ohm on input and 600:600 ohm on output?

Thanks.

techardent

Re: Racking Spectra Sonics 101
« Reply #139 on: June 03, 2010, 11:32:05 AM »
If anybody is interested.  I found this in my Spectra Sonics file.  As I understand it a lot of the components were hand picked for amplifier stability.  I am unsure who filled in the values.  I removed the link between R3 and R4 to make it accurate to the the actual card.


Spectra Sonics 101 / 100 schematic
« Last Edit: June 04, 2010, 09:37:06 AM by techardent »


 

Related Topics

  Subject / Started by Replies Last post
2 Replies
1307 Views
Last post November 23, 2005, 01:19:54 AM
by raysolinski
21 Replies
4693 Views
Last post April 16, 2008, 09:52:38 PM
by 3nity
0 Replies
817 Views
Last post May 15, 2017, 03:55:26 AM
by bxt403
10 Replies
1454 Views
Last post February 01, 2019, 12:59:54 PM
by L´Andratté