HELLO BRETT -- PIGGYBACK QUESTION

[RedHouse]

If the piggyback device is identical to the main device, the first approximation to the noise will be that it's doubled (i.e., +6db), which is a just noticeable increase in noise loudness.

Yes that'd be true, but I'm not using them in a 1-1 parallel ralationship, but adding in the 2nd transistor B-E juction via (in my case) a 33k resistor which seems to drop the contribution of the 2nd transistor immensly (10x?)

It shouldn't be a perceptable increase in noise.
(IMHO)

But then I'm not a (the) EE around here, these are only my "by Ear" findings and have no acedemic basis.

[R.G.]

Yes that'd be true, but I'm not using them in a 1-1 parallel ralationship, but adding in the 2nd transistor B-E juction via (in my case) a 33k resistor which seems to drop the contribution of the 2nd transistor immensly (10x?)

Mother Nature is a stickler for her Rules being followed. Inserting a parallel piggyback transistor adds the piggyback transistor's noise. Inserting a 33K resistor decreases the noise from the piggyback transistor, but Mother insists that the 33K resistor's noise is now added. This might be much less than the piggyback transistor's noise or more - it all depends on the circumstances and the devices.

However, as I noted:

If the devices are low noise and have the right impedances driving them, this may not be noticeable at all.

It may be that neither the piggyback transistor or the adjusting resistor make enough noise to be noticeable. Or it may be that the 33K noise is much less than the transistor's noise and so it drops the total noise by decreasing the piggyback transistor's contribution a lot.

But then I'm not a (the) EE around here, these are only my "by Ear" findings and have no acedemic basis.

Degrees and academic basis are not needed for things like "It's a lot less noisy now." All the formal training does is provide a body of explanations of why and how to.