Country of Manufacture:Netherlands
Release dates:1957 - 1960
Speeds: 3 3/4
Max Reel Size("): 7"
Number of heads: 2
Head Composition: Permalloy
Head Configuration: Mono - Full Track
Frequency Response:90 - 6kHz
Wow and Flutter:
Sound quality rating:5 / 10
Long-term reliability rating: 5 / 10
The EL3520 resulted from further development of the EL3510. The the basic mechanics remained the same, but there were a couple of significant improvements, both mechanically and stylistically.
Whilst still retaining the same basic configuration (half- track mono, 5″ maximum reel size and a single speed of 3¾ ips), the EL3520 is much more compact than the rather tall EL3510. The electronics were relocated from beneath the deck, and instead were now located at the front of the recorder, giving it a flatter and more conventional appearance. The small DM70 recording level indicator used on the EL3510 was replaced with an EM81 type.
Bias frequency: 50kHz / Valve complement: EF86, ECC85, EL84 and an EM81 / Rewind speed: 120 seconds for 270 m long play tape / Audio output power: 2.5 watts / Inputs: microphone, pick-up / Outputs: external speaker / Speaker(s): internal, diameter 4″ (10 cm) / half-track mono