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Old 5th June 2012, 05:46 PM   #11
wg_ski is offline wg_ski  United States
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Quote:
Originally Posted by Ian Finch View Post
I think that popcorn noise is intrinsic to the device. i.e it would have sounded that way from the time of manufacture.
It is intrinsic to the device - but it can get worse over time if a defect causes the device to continuously degrade. I've had input stages start out quiet and just start that crap up one day, and then get worse and worse and worse till I get fed up and replace it. Never had one in a hermetic package do this - so I suspect it's die attach or contamination issues.
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Old 5th June 2012, 07:30 PM   #12
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I've been around the whole amp. There is nothing that I can influence physically.

If I could figure out what this is, I would buy a pair and a 506 to match.
Click the image to open in full size.]
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Old 5th June 2012, 08:17 PM   #13
DF96 is offline DF96  England
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MPSA05 transistor?
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Old 5th June 2012, 08:39 PM   #14
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shhheeeyt! There I was searching for a date code!
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Old 5th June 2012, 08:54 PM   #15
DF96 is offline DF96  England
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I think 524 is the date code. I'm sure someone on here can tell you the make from the logo in front of the 5.

Decoding component marking is something of a black art; it relies on some guesswork and some pre-existing knowledge. I happened to have heard of transistors called MPSA-something, and google confirmed that MPSA05 is a known transistor type. In an extreme case I could still be wrong, but in this particular case I think I have it right.
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Old 5th June 2012, 09:05 PM   #16
jaycee is offline jaycee  United Kingdom
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Product Folder - MPSA05 - NPN Medium Power Transistor, Fairchild Semiconductor

MPSA55 is the complement. More common are MPSA06/56 which should substitute perfectly (just higher Vceo)
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Old 6th June 2012, 06:02 AM   #17
jitter is offline jitter  Netherlands
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Quote:
Originally Posted by DF96 View Post
I'm sure someone on here can tell you the make from the logo in front of the 5.
National Semiconductor. The search utility goes straight to TI, though, and MPSA05 didn't yield any results.
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