Mini Stereo

Micro-Documentary of Roberts 720 analog Vacuum Tube Reel-to-Reel tape recorder (like Akai M-7).

Posted on October 14th, 2010 by admin

This micro-documentary shows the Roberts 720, an analog reel-to-reel tape recorder that has vacuum tube electronics. It is similar to the Akai M-7, but it lacks the Akai’s cross-field bias system. Compared to the Akai M-8 that I previously owned, the Roberts 720 is noticeably quieter, exhibits a greater sense of detail, especially in the midrange; and has lower overall THD, especially at 1-7/8 ips. The Roberts 720′s level meters are superior to the Akai and have ballistics similar to Ampex professional tape decks like the 602. Therefore, recording levels can be set more precisely. The head block is better shielded, and the wiring harness layout is cleaner and better routed. The Roberts 720′s EF86/6267 input pentode is fitted with a dampener, whereas the Akai has no provision to guard its input pentode against microphonics. This may contribute to the Roberts’ superior detail. The Roberts 720 speakers are side-firing and give some sense of spatial spread, also providing better bass extension without losing highs, which are linear to 12 Kcps. Oddly, the Roberts’ motor runs all the time the deck is plugged into the mains, even if the electronics are switched off. A separate head ouptut is provided for each channel, allowing the tape drive to be used with outboard playback electronics, which can be a great advantage for archival playback of low-speed tapes. Overall, the Roberts’ electronics are simpler than the Akai M-8′s. This may explain its greater sense of detail overall

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