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I would take one enclosure in a group buy, too (if it is possible for Europeans to join).

Hi, I just did the same, I put this thing together on bread board. It is the same as with my finished LaVache - as soon as you turn back gain it starts to hiss (with a BC550C).
So for me it is clear that it is not an error in my build but a characteristic of the circuit. I just wonder why nobody else has noticed it.

You could try a BC549C or BC550C. You might end up needing to move R4 back up a bit with them too.

I tried a BC549B, BC549C, BC550C, 2N5088 and another 2N3565. They all produce about the same amount of hiss if you dial back the gain pot. So the hiss seems to be part of the design and my first 2N3565 is obviously damaged.

Hi,

my LaVache hisses quite loud when the gain pot is not maxed. I had to lower R4 to 100R (otherwise volume was too low), the rest is stock.
If gain is turned up everything is fine. But if you lower gain just a little bit you get lots of hiss. Definitely too much for such a low gain circuit.
With a 2N5088 there is less hiss than with a 2N3565 but the problem is still there.
Is there anything you can do about it?

Regards
Peter