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Old 22nd October 2013, 03:01 AM   #1
Gionni is offline Gionni  Italy
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Default Twenty years have passed, what to do?

First of all do a salute to the entire board. I am a happy owner of two finals SA/6e mono since 20 years have passed, wondering if the power transistors and capacitors are to be replaced or not. Thanks for the reply.
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Old 22nd October 2013, 08:00 AM   #2
Zen Mod is offline Zen Mod  Serbia
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transistor - why ?

caps - only ESR meter can tell

you have nice ones (uproc based) for peanuts on ebay


esr meter | eBay
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Old 22nd October 2013, 06:21 PM   #3
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Hello Zen Mod I do not speak English, and with the automatic translator I do not understand very well. you're telling me that the transistors are not to be changed?
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Old 22nd October 2013, 06:34 PM   #4
Zen Mod is offline Zen Mod  Serbia
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there is no need to change transistors

check caps with ESR meter - cheap on ebay , look at previously posted link

google translate from Serbian to Italian :

non vi č alcuna necessitą di sostituire i transistori

controllare i condensatori con ESR metro a buon mercato su ebay, vedi link precedentemente scritto

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Old 22nd October 2013, 07:13 PM   #5
flg is offline flg  United States
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Just so you know, transistors are subject to metal migration, amongst other reliability issues, where over time, temp and high current, metal atactually moves leaving the metal thin or missing in some spots. This is especially bad when the metal travels over steps on the die surface, where it was thin when freshly manufactured. This can cause catastrophic falure
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Old 22nd October 2013, 09:52 PM   #6
Gionni is offline Gionni  Italy
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Quote:
Originally Posted by Zen Mod View Post
there is no need to change transistors

check caps with ESR meter - cheap on ebay , look at previously posted link

google translate from Serbian to Italian :

non vi č alcuna necessitą di sostituire i transistori

controllare i condensatori con ESR metro a buon mercato su ebay, vedi link precedentemente scritto


Thanks Zen Mod'll measurement of capacitors with ESR meter.
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Old 22nd October 2013, 10:14 PM   #7
Gionni is offline Gionni  Italy
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Quote:
Originally Posted by flg View Post
Just so you know, transistors are subject to metal migration, amongst other reliability issues, where over time, temp and high current, metal atactually moves leaving the metal thin or missing in some spots. This is especially bad when the metal travels over steps on the die surface, where it was thin when freshly manufactured. This can cause catastrophic falure
Hello FLG would you advise me to replace the transistor? you know the suppliers who sell the transistors marked Motorola?
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Old 22nd October 2013, 10:42 PM   #8
flg is offline flg  United States
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Quote:
Originally Posted by Gionni View Post
Hello FLG would you advise me to replace the transistor? you know the suppliers who sell the transistors marked Motorola?
I would imagine it is unlikely your 20 year old amp has seen as much use as that might suggest. I would not change them purely because of age.
As ZM says though, caps dry out and other things that happen even on the self. Measuring them is a good idea. Changing to a modern upgraded component might be an improvement in sound in addition to reliability/safety?
I know the typical USA suppliers? Transistors marked Motorola were made buy Motorola. That Business however was sold to ON Semiconductor in '98 maybe.
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Old 22nd October 2013, 11:03 PM   #9
Gionni is offline Gionni  Italy
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Quote:
Originally Posted by flg View Post
I would imagine it is unlikely your 20 year old amp has seen as much use as that might suggest. I would not change them purely because of age.
As ZM says though, caps dry out and other things that happen even on the self. Measuring them is a good idea. Changing to a modern upgraded component might be an improvement in sound in addition to reliability/safety?
I know the typical USA suppliers? Transistors marked Motorola were made buy Motorola. That Business however was sold to ON Semiconductor in '98 maybe.
Thanks FLG advice
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Old 23rd October 2013, 06:56 PM   #10
Gionni is offline Gionni  Italy
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Quote:
Originally Posted by flg View Post
I would imagine it is unlikely your 20 year old amp has seen as much use as that might suggest. I would not change them purely because of age.
As ZM says though, caps dry out and other things that happen even on the self. Measuring them is a good idea. Changing to a modern upgraded component might be an improvement in sound in addition to reliability/safety?
I know the typical USA suppliers? Transistors marked Motorola were made buy Motorola. That Business however was sold to ON Semiconductor in '98 maybe.
I was informed if these components are subject to wear because I read that Motorola transistors are no longer available, however you're telling me that the transistors are always produced by ON Semiconductor "very good" but I do not know when I will make a final restoration of to feel comfortable for another 20 years.
You do not know the mica list of components (transistors) that are in the finals SA/6e
Thank you all for the answers
Gionni.
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