Jack, practically ANY small signal 'LN' pnp will do.
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I have a liking for 'small' power stuff like Jerry & jp8 but the rest of your circuit must be super for this to have even 0.1dB effect on noise.
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Higher voltage devices allow you to use plain 1n914/4148 instead of Zeners across them.? But don't leave the diodes out as their most important task is to protect the b-e junctions.
