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[AMPS] Distortion, amp design, and 813s

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Subject: [AMPS] Distortion, amp design, and 813s
From: (OZ5IQ)
Date: Thu, 20 Sep 2001 10:43:23 +0200
HI guys

The advantages of using PP amps is the fact that the input and output 
capacitance is in series so the
I/O "c"  is 1/4 of when compared to an parallel Amp.

Another is the balance which " automatic"  gives a supression of the even 

A general  made fault is that the bias for the tubes is typically only made as 
paralelling the 
DC supply for the grid 1, / cathode  - and the bias current meassured is a sum 
of those currents.
So if not bought as " a set" compared or what we call it, a good Amp can with 
ease show  hidden 
distortion , inspite looks good. This has nothing with the general Amp. to do 
thats obvious.

So eigher matched pair  - or a bias supply for EACH tube, individually 

Vy 73 de  OZ5IQ, Kim  

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