SDP-2 in Vilma 204

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SOVA

Published on Nov 16, 2020
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Another Vilma 204 with typical faults. Installation of the dynamic bias system SDP-2 (author N. Sukhov), adjustment and evaluation of the recording. The SDP-2 system has proven its effectiveness on material with a pronounced high-frequency component (this is most noticeable in electronic music), increasing the overload capacity and dynamic range of the recording. SDP-2 has no effect on musical material in which low-frequency signals predominate (bass instruments and bass synthesizer parts). In general, the system improves the recording. But it has several disadvantages: 1) Affects the amplitude of the erase signal, due to which the magnetic flux may not be sufficient to completely erase the old phonogram (in particular, on type 2 tapes) 2) Due to inertia on a musical piece with rapidly changing parts, the high-frequency signal will be detected by SDP-2, the bias current will be reduced at this moment. If the phonogram simultaneously contained a low-frequency signal, it would be slightly suppressed. 3) SDP-2 takes into account the signals of the left and right recording channels, but it corrects the recording current not for each channel separately, in accordance with the spectral density of the signal in the channel, but as a single change in current for both channels. Apart from the first, the remaining shortcomings can be considered insignificant, since they are barely noticeable or not noticeable at all on real musical material. On special signals, these shortcomings are already perceived by ear. The SDP-2 circuit is extremely simple, and is built into the Vilma 204 tape recorder with minimal modifications. Tests: Original 1: https://yadi.sk/d/GmYUuGJnXWgxWw Maxell UR90: https://yadi.sk/d/OHEO4rO4rSI3qA Maxell SXII60: https://yadi.sk/d/jGDmahR6Us4Ytw Original 2: https://yadi.sk/d/jokYdL5dAnB9pQ Maxell UR90: https://yadi.sk/d/S1OR-nsU_ONfQA Maxell SXII60: https://yadi.sk/d/7Qog_O4gpx9F6A

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