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Did I wreck the amp?
Did I wreck the amp?
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Old 12th September 2019, 03:23 AM   #21
jwilhelm is offline jwilhelm  Canada
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Quote:
Originally Posted by indianajo View Post
There are no sanken or toshiba distributors in the US that I know of. (there is allegro?)
Newark and Digikey are Sanken dealers. Mouser sells Toshiba but not old stock that everyone is looking for. Sanken has discontinued a lot or their larger transistors but the output devices used in this amp are available from Digikey.
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Old 12th September 2019, 03:34 AM   #22
Bud Barnez is offline Bud Barnez  United Kingdom
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Yes, Digikey stocks the Sankens here too.

And also in the UK, when directed to the fake transitor thread, I notice suggestion for Profusion who have better prices and resonable shipping for small orders.

It's the SD1763 d/ SB1186 drivers that I haven't found a good source for yet.
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Old 12th September 2019, 06:18 AM   #23
sajti is offline sajti  Hungary
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Originally Posted by Bud Barnez View Post
Yes, Digikey stocks the Sankens here too.

And also in the UK, when directed to the fake transitor thread, I notice suggestion for Profusion who have better prices and resonable shipping for small orders.

It's the SD1763 d/ SB1186 drivers that I haven't found a good source for yet.
Profusion is very good source for Sanken devices.

Sajti
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Old 12th September 2019, 07:20 AM   #24
googlyone is offline googlyone  Australia
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Did I wreck the amp?
Agreed. I would not choose to save the buck either, but I do accept some people take the HOBBY part much more seriously than I do.

I don't strip old boards unless there is a really (really) expensive part to salvage either. Others do...
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Old 12th September 2019, 07:42 AM   #25
sajti is offline sajti  Hungary
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Quote:
Originally Posted by Bud Barnez View Post
It's the SD1763 d/ SB1186 drivers that I haven't found a good source for yet.
This drivers are out of production, as I know. I would change them with 2SC4883A/2SA1859A, which are available from Digikey.

Sajti
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Old 13th September 2019, 01:02 AM   #26
Bud Barnez is offline Bud Barnez  United Kingdom
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Originally Posted by sajti View Post
This drivers are out of production, as I know. I would change them with 2SC4883A/2SA1859A, which are available from Digikey.
Sajti, thanks for the recommendation - added to Digikey basket.

Seems most of the devices are hard to find. Even the temperature sensor is out of production. I'm not sure what characteristic to look for in the replacement. Original is 2SD669A. I found KSC2690AYSTU-ND‎ as potential alternative. Would that seem ok?
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Old 13th September 2019, 01:07 AM   #27
nigelwright7557 is offline nigelwright7557  United Kingdom
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Originally Posted by ubergeeknz View Post
Why, if they're good? I'm not sure I follow the logic here.
It depends what is between drivers and outputs.
A lot of my designs use 390r in series with mosfet gates and so the resistors rarely burn.
If you have bi polar drivers into bi polar outputs then there is a low impedance between them, and the drivers can easily be taken out too.

I find with irs2092 class d amps if the mosfets go they often take the 2092 with them.
So now I just replace 2092 too as part of the course.
Its cheaper than just changing mosfets then they blow again.
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Old 13th September 2019, 07:17 AM   #28
sajti is offline sajti  Hungary
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Quote:
Originally Posted by Bud Barnez View Post
Seems most of the devices are hard to find. Even the temperature sensor is out of production. I'm not sure what characteristic to look for in the replacement. Original is 2SD669A. I found KSC2690AYSTU-ND‎ as potential alternative. Would that seem ok?
Looks fine. I use KSC2690A as Vbe mutiplier in my amplifier.

Sajti
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