Luxman CL 35 mk III User Manual

CIRCUIT DESCRIPTION
'.
1/2 12AX7
ECC83
1/2 12AX7
ECC83
1/2 12AU7
ECC82
200V
2«JV
l.OK
t------;jw~~::l Signal
out put
2",H
non ieverted
in put
fig. -1
Equalizer Amplitier
inverted
input
The circuit is shown in the Fig. 1. This amp has not standard method of Feedback, about
which special explanation is made hereunder.
Fig. 2 shows its concept, wherein A-3 means cathode-follower with its gain at OdB. While
A-2
has +39dB and therefore the gain is +39dB thru A-2 and A-3.
At A-I the output impedance is 110K ohms by means of electric feedback from the cathode
side. Local feedback by 2.2M ohms can be stipulated as th~ formula Beta = 1/19.8 and amount of
NF is 14dB. Therefore the gain is +25dB thru A-2 and A-3, and input impedance becoms 210K ohms.
At
A-I load is 120K ohms and gain is +32dB, and therefore the total gaLn is 57dB.
Fig. 3 shows R.I.A.A. complex. The.
total NF shall not be levied below the
cut-off frequency of 50Hz. In the case
of triode it is possible to suppress the
distortion below the sensing level under
flg.-2
small signals. The present operation
point lies at the total distortion
balance.
~ II
,.
..
..
330lPF
\~PF
II II
l;~F
rr
220PF
2201<
."
~
phono position
MlC position
This amp. plays the role of mic. amp. as
well.
fig.-3

Luxman CL 35 mk III Specifications

General

Brand	Luxman
Model	CL 35 mk III
Category	Amplifier
Language	English