Country of Manufacture:United Kingdom
Speeds: 3 3/4, 7 1/2
Max Reel Size("): 7"
Number of heads: 3
Head Composition: Permalloy
Head Configuration: Stereo
# Motors: 3
Frequency Response:(all 3 dB): 7½ ips: 40Hz -15kHz
Wow and Flutter:less than 0.2 % at 7½ ips
Signal-to-Noise Ratio:52 db unweighted including hum
Sound quality rating:6 / 10
Long-term reliability rating: 6 / 10
First released late in 1961, the Series 420 consisted of half-track (422) and four-track (424) stereo tape decks utilizing the newer Series 5 transport. The model was a bridge between the older Series 4 and the new Series 5 machines and featured separate record and playback heads. This allowed A/B comparison, echo and recording on one channel whilst playing back on the other. The two operating speeds were 7½ ips and 3¾ ips and a newer, smaller VU meter was fitted.