Cyrus 2 mk2 2sc 8834 & 2sc 8844 tranistors
- Thread starter TOMAS42
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That's a rare product if it really is a Cyrus2 model. I've never seen it listed or referenced elsewhere on the 'net. The transistors are rare too, as they are only listed by traders dealing in industrial quantities. Allegedly, there are datasheets but not for casual visitors to read. One reference stated they were d-pak (TO252) SMDs by Sanyo so you need to give us a description or confirmation in order to check the facts.
Cyrus 2 was produced in the days of discrete components so it seems odd to find TO252 types when even Cyrus 3 (1999) still used TO3P power transistors, though by then, SMT was used for the front end and microprocessor which probably was necessary to free up some space inside those tiny boxes.
There is an even bigger problem finding equivalents when you can't even find the transistor specs, so it would be wise to contact Cyrus themselves and see if you can get them to cooperate. They are thick-skinned regarding technical issues over the 'net but if you are determined, maybe you can get some useful history and advice on these by more direct contact.
Cyrus 2 was produced in the days of discrete components so it seems odd to find TO252 types when even Cyrus 3 (1999) still used TO3P power transistors, though by then, SMT was used for the front end and microprocessor which probably was necessary to free up some space inside those tiny boxes.
There is an even bigger problem finding equivalents when you can't even find the transistor specs, so it would be wise to contact Cyrus themselves and see if you can get them to cooperate. They are thick-skinned regarding technical issues over the 'net but if you are determined, maybe you can get some useful history and advice on these by more direct contact.
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The output transistors are TO220 style.
See description from the service manual.
They have their own part numbers; PT7. As there is only 80volts approximately that they have to suffer, a TIP*** would probably suit.
TIP41C - COMPLEMENTARY SILICON POWER TRANSISTORS - STMicroelectronics
See description from the service manual.
They have their own part numbers; PT7. As there is only 80volts approximately that they have to suffer, a TIP*** would probably suit.
TIP41C - COMPLEMENTARY SILICON POWER TRANSISTORS - STMicroelectronics
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But Cyrus 2 Mk2 ?? Does that version really exist and have a specific service manual? As said, there are 06, 07 and TOG issues of Cyrus 2 in the manual and certainly, they have TO220 NPN power transistors such as obsolete BUV28 or BUV48, identified as PT7. As an easy to find substitute for those, I'd pick BD911.
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