What's the best 78xx/79xx and B649/D669 replacement?

[Rafael L]

I have used the BDs 139/140, are very well in the simulator, in a real circuit, I do not know if would be good...
Told me that the good are the old philips

[keantoken]

Originally posted by Lumba Ogir
Jacco and Andrew,
the A1536/C3951 are video transistors and will unlikely sound good under heavy load. Sanyo uses the MBIT process in current amplifiers.

My thoughts are that much slower transistors are good enough for audio. Again, it will depend on the actual design and how well it handles Cob. (I assume the whole point of low-Cob transistors is to minimize HF rise in distortion?)

- keantoken

[Lumba Ogir]

keantoken,
small operating frequency range and large Cob will decrease linearity (drastically).

[keantoken]

I'm not suggesting we use slow transistors. I'm just saying I don't think 600MHz ones are necessary.

But this is getting OT. It is the poster of this thread who will decide which ones he wants. Our opinions should come only when asked for (mine included).

- keantoken

[Lumba Ogir]

Right, it is up to everyone to decide.