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Old 17th February 2014, 03:39 AM   #1
6JohnS is offline 6JohnS  United States
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Default Threshold Cas-2

I just got back the exact Threshold Cas-2 amplifier I owned back in the early 80's. Unfortunately if has some blown output transistors. I don't have a schematic and it seems impossible to find one. I would be very grateful if someone could get one to me or post one somehow. I am interested in finding the proper transistors to put back in it. My amp currently has 4 different numbers and I don't know which ones are correct, if any? I would very much like to get this amp operational again and any help I can get would be greatly appreciated. Thank You.
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Old 17th February 2014, 08:42 AM   #2
Soundhappy is offline Soundhappy  France
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Hi 6JohnS

Find this link :


THRESHOLD CAS-2 poweramp.


Have a nice day

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Old 17th February 2014, 09:50 AM   #3
Soundhappy is offline Soundhappy  France
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If look for informations about other amp models :

http://www.diyaudio.com/forums/pass-...ll-models.html

Have fun
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Old 17th February 2014, 11:33 AM   #4
6JohnS is offline 6JohnS  United States
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Hello Sound Happy, There is nothing conclusive on those sites to tell me what transistor numbers I should install. Some of the Cas-2 stuff is actually Cas-1 stuff and I need more clarity before I make any move. I have looked extensively through this forum and nothing I can find is clear enough. In fact what I do find just adds more discord. Is there anyone in this forum that has a real schematic that lists part numbers? Thank You

Here's a list of the transistors I currently have installed. There are 2 boards that hold 10 transistors each. 1 board for each channel. The forward board which is the right channel has (5) 2N6339 on the left side of the board and the Left channel board (rear board) is exactly the same. The right channel board on the right side has (4) 2N6437 and (1) 2N6438. The left channel board has (4) 2N6437 and (1) unmarked. I don't want to buy or install the incorrect transistors and could use a professionals touch on what goes where. Thanks
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Old 17th February 2014, 11:45 AM   #5
Zen Mod is offline Zen Mod  Serbia
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Threshold Cas-2
maybe this will partially help - sch made by Tiefbassuebertr

hope Papa will chime in , with hellpful info
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Old 17th February 2014, 11:55 AM   #6
Soundhappy is offline Soundhappy  France
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Hello 6JohnS

My intention was facilitate Your search in direction of guys with a collection of Threshold's ask him directly maybe?

Best regards
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Old 17th February 2014, 02:08 PM   #7
6JohnS is offline 6JohnS  United States
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Soundhappy, Thank you for your efforts and perhaps contacting him would yield more results but when you hit his link to the Threshold Cas-2 you get routed back to where you sent me.

Zen Mod, Thanks for sending those .pdf's. I had already seen them all though. The first one is labeled cas-2 but is actually cas-1. It is a very nicely done schematic. A few people have said they are the same but I am unwilling to assume that. The Cas-1 stuff shows yet another Transistor number making things less clear.

Perhaps I should be asking for someone with a STOCK Threshold CAS-2 to remove the top off the unit and look on the boards. What is the part number on the transistors on the left side of both boards (2N????) and then what is the number of the transistors on the right side of both boards (2N????)
A am very grateful for every ones help. There must not be very many of these amps around if this info is so hard to find. Thanks again for all the help.
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Old 17th February 2014, 02:53 PM   #8
Soundhappy is offline Soundhappy  France
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Quote:
Originally Posted by 6JohnS View Post
Perhaps I should be asking for someone with a STOCK Threshold CAS-2 to remove the top off the unit and look on the boards.
Try send him personal message is chance to have more informations.

Cheers
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Old 17th February 2014, 03:42 PM   #9
6JohnS is offline 6JohnS  United States
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Soundhappy, Thanks, great idea and I did just do that.
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Old 17th February 2014, 04:23 PM   #10
Zen Mod is offline Zen Mod  Serbia
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Threshold Cas-2
if Papa don't chime in here , you can always send him an e-mail and ask (write everything from post #4)

then be patient , he will respond in a day or week
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