Threshold Stasis 3 Amplifier Capacitor Replacement - diyAudio
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Old 2nd October 2016, 10:21 PM   #1
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Default Threshold Stasis 3 Amplifier Capacitor Replacement

Hi hope can get an answer to these questions😋🤔🤔

I have a Threshold Stasis 3 with low temperature operation

I want to replace the Trim Pots as they are faulty

I will have to open the amp and do some stripping of parts and boards

Should I replace any of the caps while I have the unit open ?

I see some tantalum caps and some electrolytic ones too

According to the schematic it has the following caps per channel

1 of 4.7uf 25v
2 of 47uf 50v Radial type
1 of 470uf 6.3v Axial type
2 of 0.15uf 50v
1 of 0.1uf 400v
2 of 39pf
1 of 390pf
2 of 680pf

Which to replace ?

Thanking you in advance for the replies🤗🤗🤗
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Old 2nd October 2016, 11:09 PM   #2
rayma is offline rayma  United States
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Quote:
Originally Posted by Audioman12 View Post
Which to replace ?
Yes, replace all of the electrolytic and tantalum types, but substitute electrolytics for the tantalums.
Use higher voltage ratings on all the new caps, if possible. I would leave the film and ceramic caps as-is.

Last edited by rayma; 2nd October 2016 at 11:27 PM.
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Old 15th October 2016, 09:52 AM   #3
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Default A bit of confusion, clarity sought

Hi

Set about the task but found this point that does not make sense.

I see what I think is a capacitor here with the following written on it

PSll .001 +|-2% 100vdc

I would presume this is a capacitor of 0.001uf 100vdc with 2%tolerence

This value of capacitor however does not show on the circuit diagram

Am I wrong in this in some way

Click the image to open in full size.

Click the image to open in full size.

Click the image to open in full size.

Please help

Thank you
Umesh
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Old 15th October 2016, 09:56 AM   #4
Zen Mod is offline Zen Mod  Serbia
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that's solid cap 1nF/100Vdc , no need for replacing it
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Old 15th October 2016, 04:36 PM   #5
rayma is offline rayma  United States
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Quote:
Originally Posted by Audioman12 View Post
I would presume this is a capacitor of 0.001uf 100vdc with 2%tolerence.
This value of capacitor however does not show on the circuit diagram
Looks like that value was substituted for the two 680pF caps.
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Old 15th October 2016, 07:13 PM   #6
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Yes
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Old 18th October 2016, 05:51 AM   #7
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I have read that the original 47uf 50v Infstrument Devices caps are marked on the positive side and not the negative. Capacitors are usually marked on the negative.

So is it true then that these in the Threshold Stasis 3 are marked on the positive side ?

I have read this on this forum some time ago

Your help is appreciated
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Old 18th October 2016, 09:18 AM   #8
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picture ?
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Old 18th October 2016, 06:59 PM   #9
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Yes, they have white arrows pointing toward the positive.
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Old 18th October 2016, 08:32 PM   #10
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Default Those pics

Not great pics as I have not taken them out yet

These are the two radial 47uf 50v Instrument Devices capacitors

Click the image to open in full size.

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