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HITACHI HA-6800
DESCRIPTION OF THE NEW CIRCUIT•BESCHREIGUNG DES NEUEN
SCHALTKREISES•RENSEIGNEMENTS CONCERNANT LE NOUVEAU
CIRCUIT
• Main Direct Circuit (fig. 5)
This unit incorporates a main direct system
which connects the output signals from the in-
put selector directly to the main amplifier. This
is designed to make the most of the sound
quality exhibited by the power MOS FET.
When the tone switch is set to the OFF posi-
tion, the signals do not pass through the tone
control circuit but are fed directly into the main
amplifier. The total gain of the tone control cir-
cuit is 0 dB. The gain of the main amplifier itself
is high at 44 dB.
• Heat Loop
This unit incorporates a heat loop (see Fig. 6)
with a high heat-dissipating effect. The heat
generated by the power MOS FETs is applied to
the base, transmitted to the pipe and warms up
the Freon liquid gas inside. The warmed-up gas
is turned into a stream of steam which moves
along inside the pipe and, as a result, heat is
transmitted to the fins. The steam discharges
the heat and it returns to liquid form.
• Haupt-Direkt-Schaltkreis (Abb. 5)
Dieses Gerat verfOgt Ober eine Haupt-Oirekt-
System,
das
sie
Ausgangssignale
des
Eingangswahlers direkt mit dem Hauptver-
starker verbindet, um optimale Ergebnisse von
der Klangqualitat der POWER MOS FETs zu er-
zielen. Wenn der Klangschalter auf OFF gestellt
wird, laufen die Signale nicht durch den
Klangregelungs-Schaltkreis, sondern werden
direkt an den Hauptverstarker geleitet. Der
Gesamtverstarkungsfaktor
des
Klangre-
gelungs-Schaltkreises betragt 0 dB, doch der
TONE Sw.
r - - - -
------.
I
I
I
PHONO
+18 dB
0 dB
RECo----{)() REC SELECTOR
Sw.
Tone circuit
Klangregelungs-Schaltkreis
Circuit de tonalite
Gas
Gas
Gaz
-6-
Heat dissipation through natural con-
vection
Warmezerstreuung durch natGrliche
Konvektion
Dissipation thermique par convection
naturelle
Heat applied
Zugefuhrte Warme
Chaleur appliquee
Base
Basis
Base
I
/
Main
Amp.
Fig. 5
Abb. 5
Liquid
Flussigkeit
Liquide
Fig. 6
Abb. 6
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