4R were common impedance of loudspeakers in Europe at that time, 8R were not.
It is as simply as this.
No conspiracy theories required here
It is as simply as this.
No conspiracy theories required here
Not in France where vast majority of good quality speakers brands was 8R and rarely 4R, indeed i got a Dual CDV60 amplifier from my older brother, it was specced at 2 x 18W/4R only, and so was the CV120 that was specced at 4R, since i live close to Germany, where i got just today, i know a lot of german hardware, at the time there were brands producing decent compact stereos and all were using 4R speakers.4R were common impedance of loudspeakers in Europe at that time, 8R were not.
It is as simply as this.
No conspiracy theories required here
For the oldest brands , I agree, on the other hand, since the arrival of Siare, JmLab/focal and Davis a little later, the impedance became closer to 4 ohm in the 90s/2000s, afterward the average settled closer to 8.Not in France where vast majority of good quality speakers brands was 8R and rarely 4R
For the oldest brands , I agree, on the other hand, since the arrival of Siare, JmLab/focal and Davis a little later, the impedance became closer to 4 ohm in the 90s/2000s, afterward the average settled closer to 8.
However, I have often encountered older speakers like Elipson (60s/70s), Cabasse (70s/80s) and other JMR very close to the 4 oms.
Small manufacturers like PEL or HRC were 8ohm
Yes, I meant +/- 70 VDC rails. They held up for many years running this way. I was assured by another engineer who worked for Motorola the devices were underrated.Did you mean ±70 Vdc? Never would have MJ2955's/2N3055's coped with supply voltages as high as this. Paralleling multiple devices also would not have helped either.
Anyway, about 50 years ago we could have mail ordered a 200 watt amplifier kit from a German dealer. The design featured two pairs of these devices, all in series! I never put an order, though...
Best regards!
That rings a bell, a dim memory.an MJ15015 is a DIRECT DERIVATIVE of the 2N3055
I think you refer to the ring emitter transistors that became the hot stuff of the nineties. Never got one, at that time I was on LatFETs.Wasn't that the multi-emitter types that came next?