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Re: [Amps] Solid State Amps-v- Tube Amps

To: Amps group <>
Subject: Re: [Amps] Solid State Amps-v- Tube Amps
From: Bill Turner <>
Date: Mon, 19 Jun 2017 03:31:19 +0000
List-post: <>
There is one thing about tube amps that is not often mentioned  and
that is the multiple functions of the pi- or pi-L network, something
that is not applicable to solid state amps. 

In one simple circuit you can do all of the following:

1.  Tune out the effect of the tube's output capacitance.  It simply
becomes part of the pi-network tune capacitor.

2.  Suppress harmonics, given sufficient Q.

3.  Match the tube's impedance to the load impedance.

4.  Compensate for odd values of load resistance and reactance.

5.  Supply the "missing" half cycle of RF in a single ended amp, given
sufficient Q. 

And by use of a small coil in the anode lead, step down the tube's
impedance to a low value which allows use of an output circuit at high
frequencies which other wise would have excessive Q. 

Just something to keep in mind when choosing your type of amp. 

73, Bill W6WRT
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