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Sound Rating: 5 / 10 # Owners: 1
Relaibility Rating: 5 / 10 Views: 186

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Technical Details

Brand: Rola

Model:Professional 77 MkII

Category:High Fidelity

Application:Consumer

Electronic:Tube

Country of Manufacture:Australia

Release dates:1957 - 1960

Tracks:1/2 Rec/PB

Speeds: 7 1/2, 15

Max Reel Size("): 7"

Number of heads: 3

Head Composition: Permalloy

Head Configuration: Mono - Full Track

# Motors:

Auto Reverse?:No

Voltage(s): 220-240v

Frequency Response:

Wow and Flutter:better than 0.2% at 7½ ips. better than 0.15% at 15ips

Signal-to-Noise Ratio:not less than 52dB below 2% THD

Sound quality rating:5 / 10

Long-term reliability rating: 5 / 10

Additional Details

Description

Originally released in 1956 by Byer, the Mk II bears a striking resemblance to the “66”.
However, specifications were improved and the 77 Mk II now conformed to
international CCIR standards.
Byer was bought out by the Rola company in 1957 who took over production
of recorders. The Byer badge remained on the Mk II for a year or so after the takeover before it was re-badged as the Rola 77 Professional. It was replaced by the
Rola 77 mk III in 1962.

Additional Info

Timing accuracy: ± 0.1% (± 1.8 seconds in 30 minutes) / Fast wind time: 45 seconds for 1200ft / Distortion: record: less than 1% (from 600 ohm input) play: less than 1% at 0dB out / Frequency response: at 7½ ips – 40 -10,000 cps ± 2dB. 30 -14,000 cps ± 4dB at 15 ips – 40 -15,000 cps ± 2dB. 30 -18,000 cps ± 4dB / Inputs (all balanced): 50 ohm microphone, 600 ohm line and 100 kohm bridging input / Outputs: balanced 600 ohm, 3.5 ohm for monitor speaker / Power output: 2 WATTS AT 2.5% DISTORTION / Valve complement: 1 x 5Y3GT, 1 x 12AT7, 2 x 12AU7, 1 x 12AX7, and 3 x EF86 / Bias frequency: 55 Kc / s / Speaker(s): internal Rola speaker / Dimensions: 20¼ x 14 x 7½ inches (514 x 356 x 191mm) / Weight: 47 lbs (21.36 kg) / : / full-track mono

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