Then it is up to you if that is worth 150 dollar for a NOS Tesla, 350 dollar for a used TFK ECC803S, or even 1000 Dollar for a NOS TFK. With NOS TFK I recommend you to buy only such that DC parametric tested.
It has a bold character with a fair amount of harmonic density but remains very open sounding whether played clean or overdriven. The ECC83MG is a little more polite than the JJ ECC83S which is pretty aggressive. Tonally it fits very nicely right between the JJ ECC83S and JJ ECC803S. This pages describes the ECC803S tube, and about the confusion with this tube part numbering system. Click here / this page was moved (Last updated: 02-Jan-2017 19:43 ) www.jj-electronic.sk 9 ECC83 S R. F. DOUBLETRIODE Base: NOVAL U f = 6,3/12,6 V I f = ca.300/150 mA Typical characteristic: U a = 250 V U g = -2 V I a = 1,2 mA S = 1,6 mA/V R i = 62,5 kΩ µ =100 Limiting values: U a = 300 V W a =1 W I k mA=8 U g = -50 V R g = 2,2 MΩ U k/f = 180 V R k/f = 150 kΩ Capacitances: system I. system II. c g/k= 1,6 1,6 pF c a= 0,33 0,33 pF c g/a= 1,7 1,7 pF Dimension