Hello All Friends,
I Have 10 Pairs of Fujitsu's Original 2SC 2522 and 2SA 1072 Bipolar Transistors
Anybody have Audio Amplifier Circuit have using 2SC 2522 and 2SA 1072 Bipolar Transistors ?
Datasheet Image attached,
please Enlighten me
Thanks
I Have 10 Pairs of Fujitsu's Original 2SC 2522 and 2SA 1072 Bipolar Transistors
Anybody have Audio Amplifier Circuit have using 2SC 2522 and 2SA 1072 Bipolar Transistors ?
Datasheet Image attached,
please Enlighten me
Thanks
I don‘t know specifically of any amp that uses those, but they are suitable for any amp up to +/-55 volts or so, with at least two pairs per channel. Three wouldn’t be overkill. You would use more if going class A. With these exceptionally high speed devices, I would be looking at CFA designs because they can be used up to several hundred kHz, and I would look at them as an opportunity to experiment with getting extreme bandwidth that run of the mill transistors can’t offer. You can use them in any well designed amp, but there are the situations where these will work well and others won’t.
i would also hang on to a couple of pairs for those situations where I get a 70’s or 80’s receiver in for repair that uses TO-3’s that you can’t get anymore, especially if they are ring emitters or LAPTs.
i would also hang on to a couple of pairs for those situations where I get a 70’s or 80’s receiver in for repair that uses TO-3’s that you can’t get anymore, especially if they are ring emitters or LAPTs.
Thank you very much wg_Ski for valuable information
Can I use this for Jean Hiraga Class A amplifier??
It would be like using a racehorse to haul a plough. Almost any modern, low cost power transistor suitable for easy-going class A audio, will be fine and stable in a small class A amp like Hiraga's "le monstre" but you aren't being specific. Hiraga proposed many variations and power levels of his symmetric class A design. In any case, I suggest that it would be smarter to sell those rare and fast semis (best suited to class AB) and pocket the difference between their market value and current audio power transistor prices.
80 Mhz !! in a T03 case. Wow those are nice.
Definitely deserve something better than class A
As mentioned, very suitable for high bandwidth, low distortion class A/B
Definitely deserve something better than class A
As mentioned, very suitable for high bandwidth, low distortion class A/B
If we catch you using BD139, MJE340, or any TIP drivers with these we’ll have you flogged with a $1.99 Wal-Mart RCA cable.
I was able to get over 500KHz full power cleanly out of one of the old 20 watt Pass designs from 1978 using junk box transistors. The article said it would do it, and I had to see for myself. Trying to do the same with a class AB, and 2MHz transistors caused a fire. Put in those 80 MHz outputs with an appropriate switch off network I bet it would have held.
Ive got a super-speed CFA in the pipeline, and I’ve been saving some Toshiba C2565/A1095’s for it. All of them were salvaged from prior work and the working channels of dead amps. Again, 80 MHz transistors, now unobtainium.
I was able to get over 500KHz full power cleanly out of one of the old 20 watt Pass designs from 1978 using junk box transistors. The article said it would do it, and I had to see for myself. Trying to do the same with a class AB, and 2MHz transistors caused a fire. Put in those 80 MHz outputs with an appropriate switch off network I bet it would have held.
Ive got a super-speed CFA in the pipeline, and I’ve been saving some Toshiba C2565/A1095’s for it. All of them were salvaged from prior work and the working channels of dead amps. Again, 80 MHz transistors, now unobtainium.