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RE: Purpose of these Caps?

I agree with this but it is also important to note that since it is a transformer, the Rp of the driver tube appears in parallel with the secondary inductance keeping it a low impedance path to ground and the Rp also damps any ringing that the grid current causes.

It is the case of just a grid choke where things get squirrelly with grid current since then you simply have the grid choke inductance in series with the DCR and this combo really rings out when it is excited.

I must add that this is just an observation of what really happens and not a judgement of the actual sonics since may people who have tried grid chokes praise them then go on to give an inaccurate rationale as to why it sounds better.

dave




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