Stereo power amplifier which supplied all the technologies which a Marantz of those days has, eliminated all the cost restraints entirely and developed them.
In order to be stabilized moreover and to take out the Oide power of the channel 400W of one side high-definition, the whole page is considered for the power block as the perfect push pull stream composition.
And 18 single-sided channels use the power transistor which attains to PC200W. It divides into every 3 six groups, and drives with six drivers. It is a circuitry only using the best fraction of the reality of hfe in which luxury is not.
By the original Low-TIM design, since the open loop gain was stopped very low with 56-57dB, the amount of NF which has an ill effect on a dynamic behavior is decreased just like thermionic-tube amplifier.
The dual transistor and diode array which arranged the property with the glass epoxy double-sided through hole platform with a high robustness developed for computers ideally are used for each point. Furthermore, these have been arranged to the perfect symmetry, also electrically, it acted to perfect one as Izzi of the fator also in temperature, and the occurrence of DC drift is banished from the material and the circuitry.
A tone quality deteriorates, so that the number of contacts increases. In SM1000, in order that even a speaker termination may pass a direct signal without a contact, the speaker protection relay is eliminated. If DC component should occur for a speaker component, an original SCR crowbar circuit detects and the fuse of a primary side is cut immediately, and it is the De Dis charge about the energy in a power source capacitor. A speaker is early protected certainly rather than a relay protector.
A cut-core transformer with the capacity of 800VA. The mass audio capacitor of 23500 micro Fx2 of the Marantz requests for price quotations which investigated the merit of the tone quality thoroughly from the property of the hearing is carried.
These begin the power-source part splendidly located in a line symmetrically, and SM1000 is the right-and-left independent stream composition which incorporated similar two sets of monophonic amplifier and which was put into practice.
The finger heat decipator borne by the technology of NASA is adopted as the heat radiator of a power transistor.
A proved thing is further improved by P510, five kinds of fins with which length is different are attached to each power transistor, and forced-air cooling is carried out by a cooling fan.
And the temperature of a heat sink is detected, and it is carrying out mechanized variable [ of the rotation of a cooling fan ] so that it may always maintain at constant temperature. This has prevented the transition of the tone quality by temperature unevenness.
The logarithmic comression supporting type power meter which can be monitored without a range switchover from the Koide power to the Oide power is adopted. Although it is a peek operation, the value which an index number shows is the output window to an 8-ohm operation as it is.
Speaker terminations total three lines of SUB1 which can switch switchpoints with the switchpoint in a front ceiling panel other than the direct termination along which it does not pass at all, and SUB2.
The input terminal which can perform a selection of DC amplifier and AC amplifier.
Canon termination equipment which can respond as a pro youth besides a RCA-pin terminal.
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