OK I can't find Q106, an SDS-7204 this side of the pond!
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Peavey XR 696F - I made a booboo
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Originally posted by jondoe View PostOK I can't find Q106, an SDS-7204 this side of the pond!
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Seems like quite a meaty transistor!
I found this Peavey transistor cross reference document;
Peavey_Transistor_Cross.pdf
It recommends a 2N6557 or MPS-U10, both of which I also can't source for anything less than the price of a kidney. Would it be advisable to also change Q117, so there are a pair of new transistors?
Thanks!
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Originally posted by jondoe View PostSeems like quite a meaty transistor!
I found this Peavey transistor cross reference document;
[ATTACH]56006[/ATTACH]
It recommends a 2N6557 or MPS-U10, both of which I also can't source for anything less than the price of a kidney. Would it be advisable to also change Q117, so there are a pair of new transistors?
Thanks!
Dang - wrong part - deletedLast edited by nickb; 11-21-2019, 07:24 AM.Experience is something you get, just after you really needed it.
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Originally posted by nickb View PostRS have them in packs of 100 for £8.80 for 100 https://uk.rs-online.com/web/p/products/8051129/
You won't have to worry abut running out of them!!!!! Ever!Originally posted by EnzoI have a sign in my shop that says, "Never think up reasons not to check something."
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Originally posted by g1 View PostNick, that's a 6517 rather than 6557, is that what you meant?
Can't find a decent cross for the moment. If I get time I'll try later.Experience is something you get, just after you really needed it.
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Originally posted by nickb View PostNo I didn't mean that but I see what happened. I searched for the required part and it brought up the wrong one (nearest lexical match- how dumb is that?) and didn't spot it. Well spotted - thanks. Updated post.
Can't find a decent cross for the moment. If I get time I'll try later.
Thanks Nick, I'm glad it was well past the 8pm order cut off when I saw this last night
Would the following be a suitable replacement?
https://uk.rs-online.com/web/p/bjt-b...stors/7613701/
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Originally posted by jondoe View PostThanks Nick, I'm glad it was well past the 8pm order cut off when I saw this last night
Would the following be a suitable replacement?
https://uk.rs-online.com/web/p/bjt-b...stors/7613701/
No, that will fry. The best I came up with was an MJE340 but the pinout is wrong and it's a bit slow. Might work at a push.Experience is something you get, just after you really needed it.
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The originals are 10w parts, that is why the little MPSA would burn.
We can deal with the legs in different order by turning the part sideways.
I still have a few 6557 as well as a coupl MPSU10, but in similar parts, I usually just find a TO220 from my stock.Education is what you're left with after you have forgotten what you have learned.
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Originally posted by Enzo View PostThe originals are 10w parts, that is why the little MPSA would burn.
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The Peavey suggested replacement 2N6557 is a 2W part, were the originals just very over spec'd for some reason?
I just found this CEN-U10, it's a direct replacement for the MPSU10, which itself is a recommended alternative part on Peaveys list. It's a little expensive per unit and a 16 week lead time on Mouser It's look like the MJE340 and hoping it fits in around the heat sinks!
On closer inspection the one I removed from the amp was actually an MPSW42, which looked factory!
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Originally posted by jondoe View Post
I just found this CEN-U10, it's a direct replacement for the MPSU10, which itself is a recommended alternative part on Peaveys list. It's a little expensive per unit and a 16 week lead time on Mouser It's look like the MJE340 and hoping it fits in around the heat sinks!
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