This is the circuit that requires the high hfe transistors. It is an old HK330C receiver
There is a malfunctioning transistor in the phono stage. I figured out that the components are at the end of life and might not be a bad idea to replace them all as I am in there...
On Semi BC560C & BC550C are in stock at farnell UK for $.25 ea. The datasheet has the 1 and 1.4 db noise spec. newark (SC) can direct order them.
Update:
Both Mouser nor Digikey list BC560s as obsolete and neither has stock as far as I can tell.
Rochester has plenty, in a variety of grades, but the min buy is $250 (~2000 pcs) for the most expensive (BC560CG by OnSemi)
Anyone interesting in splitting an order with me?
Kind regards,
Drew
Both Mouser nor Digikey list BC560s as obsolete and neither has stock as far as I can tell.
Rochester has plenty, in a variety of grades, but the min buy is $250 (~2000 pcs) for the most expensive (BC560CG by OnSemi)
Anyone interesting in splitting an order with me?
Kind regards,
Drew
Some enterprising person needs to make micro-breakout boards for a couple of BC850 or BC860's - connected with emitter resistors a pair of the SOT23's will have comparable dissipation rating and noise performance I reckon.
Farnell quote BC560 as no longer manufactured, as is the BC179, but the NPN ones (BC550's and BC109C's) are available (109C is "best seller")...
Farnell quote BC560 as no longer manufactured, as is the BC179, but the NPN ones (BC550's and BC109C's) are available (109C is "best seller")...
I was lucky enough to foresee this ahead of time -- and I bought 1000 of each so I'd have plenty of BC550-560 parts to mess around with, enough for the rest of my life.
I'm glad I did.
Maybe you, dear reader, might want to imagine the delisting of your favorite through hole devices ... and then immediately buy a lifetime supply now. I suspect you'll be glad you did.
I'm glad I did.
Maybe you, dear reader, might want to imagine the delisting of your favorite through hole devices ... and then immediately buy a lifetime supply now. I suspect you'll be glad you did.
The wafer appears to have moved to India. CDIL is now producing the BC560-TO92. I can not say if the quality is right. It's a shame how the good parts disappear just because they're not SMDs.
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The side-by-side comparison feature of DigiKey's "Parametric Search" may be a useful research tool for you, when you seek as-good-or-better parts from other manufacturers.
Four hundred eleven thousand in stock at DigiKey ... in the SOT23-3 surface mount package. Draw your own conclusions.
I was just checking the Art of electronics table on Va and saw Mark's topic too. Really cool findings! Measuring the Early voltage "VA" of some PNPs at 8mA