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== Short description ==
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== Kurzbeschreibung ==
4 track tape recorder mono
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4 Spur Tonbandgerät Mono / Stereo
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== Daten ==
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'''Allgemein'''
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* Hersteller:[[Tesla]]
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* Modell: B4
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* Baujahre: ca.1966
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* Hergestellt in: Tschechoslowakei
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* Farbe: grau
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* Abmessungen (B/H/T): 315 x 300 x 120 mm
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* Gewicht: 7,5 kg
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* Neupreis ca.:
  
== Data ==
 
'''General'''
 
* Manufacturer: [[Tesla]]
 
* Model: B4
 
* Year of manufacture: ca.1966
 
* Made in: ČSSR
 
* Colour: grey
 
* Dimensions (W/H/D): 315 x 300 x 120 mm
 
* Weight: 7.5 kg
 
* Original price approx:
 
  
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'''Anschlüsse'''
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''Eingänge''
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*DIN 5 Plattenspieler 300mV/1,5MOhm
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*DIN 5 Mikrofon 0,8mV/4kOhm
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*DIN 5 Radio 1,6mV/4kOhm
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''Ausgänge''
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*DIN 5 Radio 0,8V/10kOhm
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*DIN 5 Diode 0,5mV
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*DIN 5 Kopfhörer 0,8 - 2,5V/0,5 - 4kOhm
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*DIN  Lautsprecher 4Ohm 3W/1,5% Klirrfaktor
  
'''Connections'''
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'''Technische Daten'''
'''Inputs'''
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* max. Spulendurchmesser: 147mm
*DIN 5 turntable 300mV/1,5MOhm
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* Antrieb: Außenläufermotor (wie Pabst), Primärriemen zur Stufenscheibe, Reibradantrieb zu Schwungmasse und Spulenteller
*DIN 5 Microphone 0,8mV/4kOhm
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* Köpfe: Kombikopf, Löschkopf
DIN 5 radio 1,6mV/4kOhm
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* Spuren: 4 Mono
''Outputs''
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* Bandgeschwindigkeiten: 9,53, 4,76, 2,38 cm/s
*DIN 5 radio 0,8V/10kOhm
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* Schlupf:
*DIN 5 diode 0,5mV
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* Gleichlaufschwankungen: bei 9,53 = +/-0,2%, bei 4,76 = +/-0,3%, bei 2,38 = +/-0,5%
*DIN 5 headphones 0,8 - 2,5V/0,5 - 4kOhm
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* Tonhöhenschwankungen:
*DIN loudspeaker 4Ohm 3W/1,5% distortion factor
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* Gesamtfrequenzgang:    bei 9,53 = 50Hz - 16kHz, bei 4,76 = 60Hz - 8kHz, bei 2,38 = 100Hz - 4kHz
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* Signalrauschabstand:
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* Fremdspannungsabstand:
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* Klirrfaktor:
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* Entzerrung:
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* Übersprechdämpfung:
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* Löschdämpfung
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* Vormagnetisierungs- und Löschfrequenz: ca.70kHz
  
'''Technical Data'''
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'''Besondere Ausstattungen'''
* max. coil diameter: 147mm
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* hier, wenn vorhanden
* drive: external rotor motor (like Pabst), primary belt to step pulley, friction drive to flywheel mass and bobbin plate
 
* heads: combi head, erasing head
 
* Tracks: 4 mono
 
* Tape speeds: 9.53, 4.76, 2.38 cm/s.
 
* Slip:
 
* Synchronization variations: at 9.53 = +/-0.2%, at 4.76 = +/-0.3%, at 2.38 = +/-0.5%.
 
* Pitch fluctuations:
 
* Overall frequency response: at 9.53 = 50Hz - 16kHz, at 4.76 = 60Hz - 8kHz, at 2.38 = 100Hz - 4kHz.
 
* Signal-to-noise ratio:
 
* Spurious Ratio:
 
* Distortion ratio:
 
* Equalization:
 
* Crosstalk attenuation:
 
* Cancellation attenuation
 
* Premagnetization and cancellation frequency: approx.70kHz
 
  
'''Special Equipment'''
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== Bemerkungen ==
* here, if available
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Weitere Modelle der gleichen Serie:B41, B43, B43a
  
== Remarks ==
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== Bilder ==
Other models of the same series:B41, B43a, B46, B47
 
  
== Pictures ==
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== Testberichte ==
 
 
== Test reports ==
 
  
 
== Links ==
 
== Links ==
  
[[Category:Tape machines]]
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[[Kategorie:Bandmaschinen]]
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[[Kategorie:Entwurf]]
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