DC current gain on Philips BC337-40 & BC327-25

[dreamth]

There were some measurements done in the past showing Rbb=40 ohms for bc327.I think somewhere in the Paradise phono preamp topic were published such measurements by Gerhardt as it's all done with bc327/bc337:

 

[jean-paul]

I counted on thumbs, and my dog helped. Yes, try OLG near 60.

Still, with closed-loop gain near zero, even at 60V supply, it can get 3V peak output at near 0.3%THD, and 0.02% at lower levels. It's not an amazing performer, but it don't stink. (Even with the zero-bias 2nd stage.)

Theory versus reality and both worse than the source driving it.

It is some time ago but there was something else in the device causing trouble but I forgot. In the X-Pre I recall the source selection switch and volume potentiometer and their solder joints plus those of the RCA connectors to go bad but what was the issue with X10D?

Edit: memory tells using a higher current rated transformer made impact.