Racking Spectra Sonics 101
« Reply #100 on: January 19, 2007, 05:18:52 AM »
just a sugestion, but this should be in the meta.
its not there yet,
www.frankrobertanderson.com


Racking Spectra Sonics 101
« Reply #101 on: January 24, 2007, 12:10:14 AM »
has anyone tryed the make before break switch with a cap yet. and does it solve the problem of the pops?
its not there yet,
www.frankrobertanderson.com

cannikin

Racking Spectra Sonics 101
« Reply #102 on: January 24, 2007, 12:34:55 PM »
Joe mentioned a cap before the switch - page 6 of the thread.

I got a make before you break switch in addition to the cap fixed the "pop" issue for me.
Tube limiters..yum!

Racking Spectra Sonics 101
« Reply #103 on: January 25, 2007, 04:12:17 AM »
good it does work then. also did you just use the four possition switch or did you figure what the values would be for more stages? i just got two and so i am kind of excited.
its not there yet,
www.frankrobertanderson.com

hejsan

Racking Spectra Sonics 101
« Reply #104 on: February 07, 2007, 01:49:00 PM »
Hi, I'm starting racking up of a pair of channels.

On the 101 cards, are there only 2 caps that need to be replaced, or are some of the small capacitors also electrolyte?

What capacitors have you guys used?

Thanks,
hejsan
Just remember -- if the world didn't suck, we would all fall off.
Quote from: "Butterylicious"

3nity

Racking Spectra Sonics 101
« Reply #105 on: April 04, 2008, 10:28:43 AM »
i'm trying to gather all the info i need to finally rack mines...but i have a question if i usae  a rotary switch for steped gain is there anyway i should be able to install an output trimmer?? or should i use a 50K rev Log instead?
thanks.
Life is a path, death the destination.

Animatic

Racking Spectra Sonics 101
« Reply #106 on: July 18, 2008, 01:00:37 AM »
Used to have a studio rack FILLED with these things.
3 dozen or more SS 101's, and sad to say, without consulting me,
the whole rack went to a landfill decades ago.  
I was sad then and sadder now...

It was out of a rebuilt Flickenger console.
Or maybe the SS were the rebuild new parts.

As to the feedback gain question a simple 25k linear pot
would easily replace the resister choices I think.
Personally I would use a 50K.
put it in and run it with a scope
and mark your DB points on a scale.
Nothing really says it needs to be fixed.
Go with what ya know and work with what ya got.
Then build more.

3nity

Racking Spectra Sonics 101
« Reply #107 on: August 23, 2008, 12:29:59 PM »
How old are those boards? Do you think they could something wrong? with them given the age on them?

Like resistors or non electro caps ( i already replaced the electros)

Thanks by the way.
Life is a path, death the destination.

Animatic

Racking Spectra Sonics 101
« Reply #108 on: August 23, 2008, 01:42:17 PM »
Likely pre 1970...
The're cool,
but the same thing is smaller than your fingernail these days.
And likely cleaner.  But they are still interesting
and should have a defined sound.
Only listening will decide if this is a good sound for you.
IMHO.

I find it interesting that so many are looking to the tech of the past,
to create the sounds for tomorrow. I still love tubes.
Go with what ya know and work with what ya got.
Then build more.

3nity

Racking Spectra Sonics 101
« Reply #109 on: August 23, 2008, 08:24:02 PM »
The reason why i asked that...its cuz theres a 10R just after the 24 volts pad...burning every time i powered the cards!

What can be wrong?
Life is a path, death the destination.


raysolinski

Racking Spectra Sonics 101
« Reply #110 on: August 23, 2008, 11:46:39 PM »
Bad transistor? these guys are pretty simple...do you have the schematic? I know I have one around here somewhere.....

Ray
"orange whip?..orange whip?...3 orange whips please"

Animatic

Racking Spectra Sonics 101
« Reply #111 on: August 24, 2008, 12:10:57 AM »
I'd say try a much lower voltage like 5v and see what's happening around
the circuit WITHOUT smoking it. Gradually bring it up and check voltages/current etc.
Go with what ya know and work with what ya got.
Then build more.

3nity

Racking Spectra Sonics 101
« Reply #112 on: August 24, 2008, 09:20:57 AM »
I'm gonna try that...(lower voltage)...
I'm pretty sure its a bad transistor but hey where can i find this oldies?

I'm thinking of lift some parts, where power  flow trough and see if the 10R still burns untill i identify the bad part.

Thanks guys.
Life is a path, death the destination.

Animatic

Racking Spectra Sonics 101
« Reply #113 on: August 24, 2008, 09:42:51 AM »
Post a parts list.
I am sure there are close approximations still available.

If I still have a schematic for these,
it is 10 boxes down, in a storage box 12,000 miles away.

But they shouldn't be hard to draw out.
Might be a useful thing to do anyway.
Go with what ya know and work with what ya got.
Then build more.

3nity

Racking Spectra Sonics 101
« Reply #114 on: August 24, 2008, 04:48:47 PM »
Life is a path, death the destination.

3nity

Racking Spectra Sonics 101
« Reply #115 on: August 24, 2008, 07:30:20 PM »
before going on with the trouble shooting i wanna make sure that wiring is right...

heres a pic of how i did it...


I;m sorry for not getting it guys...
Life is a path, death the destination.

Animatic

Racking Spectra Sonics 101
« Reply #116 on: August 24, 2008, 11:19:15 PM »
Man! is THAT nostalgic.

Talon has the 2N4248, 2N3566,  transistors in stock

http://www.talonix.com/shop/item.aspx?itemid=3292

TheCS1711 is discontinued but here's the data sheet

http://www.datasheetarchive.com/pdf-datasheets/DataBooks/52-68.html


One stupid question.
Were you using the feedback gain pot turned low?

At this age caps are the 1st choice for things gone bad.
Resisters might change value a bit, but not quite die off yet.
Go with what ya know and work with what ya got.
Then build more.

clintrubber

Racking Spectra Sonics 101
« Reply #117 on: August 25, 2008, 08:49:25 AM »
IIRC the circuit in the patent featured a few Ge-transistor types, yet most/all implementations here use all-Si. Anybody knows more ? Maybe most of the real-world boards had Si perhaps ?
Hah, maybe they had already switched to all-Si by the time the patent was granted (1968) :wink:

From the patent I get the impression that at the time of writing (1965) the choice for Ge or Si was partly influenced by the cost of the one over the other, who knows that might have been the main reason... ?

http://www.pat2pdf.org/patents/pat3376515.pdf

3nity

Racking Spectra Sonics 101
« Reply #118 on: August 25, 2008, 02:40:43 PM »
I used a 10K resistor as a fixed gain.
Life is a path, death the destination.

3nity

Racking Spectra Sonics 101
« Reply #119 on: August 26, 2008, 08:01:27 PM »
bump?
Life is a path, death the destination.


 

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