Tesla AZK 895 Echolana 2 Dozvukové páskové zařízení, 1965-1968, made in Czechoslovakia

Transistor tape echo from the 60's. Four length buttons which can be combined in any fashion, eg. you can depress all of them or just the 1st one and the 3rd one and get yet another type of delay line

Link: radiomuseum | radiomuseum

Technische Daten: el-me-se [PDF] | Description: czechkeys.blog

Country: Czechoslovakia
Manufacturer / Brand: Tesla; Praha, Bratislava etc.
Brand Supraphon
Year: 1967 ??

Category: Sound/Video Recorder and/or Player
Semiconductors (the count is only for transistors) 7:
Main principle Audio-Amplification
Wave bands - without
Details Tape Recorder
Power type and voltage Alternating Current supply (AC) / 120/220 Volt
Loudspeaker - For headphones or amp.
Power out
Model: Echolana II AZK 895A - Tesla; Praha, Bratislava etc.
Material Metal case
Shape Tablemodel with Push Buttons.
Dimensions (WHD) 305 x 115 x 225 mm / 12 x 4.5 x 8.9 inch
Notes

Echo-/Hall-Gerät. Prinzip: endlos Magnetbandschleife, 1 Löschkopf, 1 Aufnahmekopf, 4 Wiedergabeköpfe; Bandgeschwindigkeit: 39 cm/s, Frequenzgang: 50...12000 Hz. Eingänge: 2× Mikro, 1× Gitarre.
Verbesserungen zum Echolana beim Bandtransport sowie andere Frontoptik.
Net weight (2.2 lb = 1 kg) 7 kg / 15 lb 6.7 oz (15.419 lb)

first example:

 second example:

third example: