Technical Details
Brand: Rola
Model:Professional 77 MkII
Category:Super High Fidelity
Application:Consumer
Electronics:Tube
Equalization:IEC
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
Auto Reverse?:No
Voltage(s): 220-240v
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