Luxman CL 35 Mk3 Service Manual

Page 1

ULTIMATE HIGH FIDELITY STEREO COMPONENT
CONTROL CENTER

SERVICE MANUAL

Page 2

CIRCUIT DESCRIPTION

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R} 1: L? 1: saw 240v
l 350M 190M 1 HA
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non inched -- h 112v
in.» 33 am a
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q
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! EUUIIU Lax
'-W_0 signal
5 S 5E 7/! 00 nu!
- _ inveflad
fig. 1 iwm

Equalizer Amplifier

Equalizer Amp .

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-l 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 the formula Beta = 1/19.8 and amount of
NF is lHdB. Therefore the gain is +25dB thru A-2 and A-3, and input impedance becoms 210K ohms.

At A-l load is 120K ohms and gain is +32dB, and therefore the total gain is 57dB.

Fig. 3 shows R.I.A.A. complex. The

. total NP shall not be levied below the

cut-off frequency of 501-12. In the case

of triode it is possible to suppress the

distortion below the sensing level under

ii .-2 o
3 small signals. The present operation
point lies at the total distortion
5% balance.
m II
"' mane pom-on
II 3WF
,m; This amp. plays the role of mic. amp. as
15:6:PF :
m m" well.

AN 5 MAC Bosnian

fig.-3