Does anyone have the databook from Philips 1971(?) containing transistors and in particular an amplifier schematics based on AC125, AD161, AD162 and BC547. I 'm l0ooking for the schematics of the amp.
I think the circuit in Figure 3.23 in that book is my first Hifi amplifier that I picked up as junk in about 1980. I gutted it out of a console stereo that had been dumped and made a new case for it. My speakers at the time were a DIY by my Father, using the Rola 6WR and 5FX. It had no over current protection for the output stage and would quickly destroy itself if the output was shorted. At least it wasn't too difficult buying the AD161 and AD162 transistors back then. That's a walk down memory lane, for sure.
Is it this amplifier? https://frank.pocnet.net/other/Philips/elcoma/Philips_SemiconductorsICs_2_1970-10.pdf
It still isn't over here. I bought one of each earlier this year to repair the amplifier of an old gentleman, who had bought his amplifier new in the early 1970's.
Tackar! That's the one. When I built this I used BC547 otherwise exactly like this. It's a shame that I haven't got any pictures of it since it was quite nice looking. It had a walnut cover and highly polished brass chassis.
It was page 101 of the document I provided you, next time, believe me, you will search on your own.
For goodness knows what reason, I have always hung-onto one pair of mint AD161 & AD162 transistors. I think their vintage is better than the very first.
That 8 W amp. design presented by @MartinX is soooo amazingly nostalgic 🙂
I would love to see some 'smart cookie' present a NON GERMANIUM 'equivalent' using today's higher spec. components and no thermistor.
PS.
I was always quite surprised at the collector current spec. of some AC series devices > and WHO remembers the 2N301 ???
That 8 W amp. design presented by @MartinX is soooo amazingly nostalgic 🙂
I would love to see some 'smart cookie' present a NON GERMANIUM 'equivalent' using today's higher spec. components and no thermistor.
PS.
I was always quite surprised at the collector current spec. of some AC series devices > and WHO remembers the 2N301 ???
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I seem to remember an AD160/161 10 W amp published in Practical Electronics in the very early 1970s (maybe ‘71 or ‘72) very similar to this. As with most of those vintage DIY amps, the internal wiring and construction were complex to say the least - but it looked good from the outside to my adolescent eyes. A few years later the ‘Texan’ came along and, using power silicon bipolars got a lot more power. Very nostalgic stuff!
Thanks for this link and thus beautiful discovery for me.
I think i have 2 or 3 pieces to send to the museum .
That wasn’t the one. I was looking for the AC125 design. Your example was much more modern with more silicone transistors.