Big thing, eh ?
A real pity Tandberg didn't carry on - or couldn't compete with Nakamichi's "aura", Teac's rep', Sony's sales or Akai's quality...
The TCD 3004 sported two Tandberg patents (DYNEQ and ACTILINEAR) which both allowed for a better matching of the callibration, bias current and frequency response with the tapes. Dual-capstans, three heads, a dedicated calibration meter - and then some :
three motors for FF spooling, REW spooling and capstan drive plus one for the pinch-rollers and heads plate up/down movements (the "release" button activates that motor).
An optional remote-control could make things easier for the user, even if it necessitated a wired IR receiver (RC 20R) and a wireless IR transmitter (RC 20T) ; the RC 20R doubles up as timer switch.
Sign of the times, 19" rack adaptors could still perfect the super-studio looks of the TCD 3004 - but they were optional.
An "Indicator" single-digit LED is present to assert micro-processor faulty function or correct operation - strange.
Full-tilt boogie : the TCD 3004 also had a "Dolby FM" position - way too late after the train had (not) passed !
Shown here below is the TCD 3004 next to a TPT 3001 tuner, TCA 3002 preamplifier and TPA 3003 power amplifier. Impressive, isn't it ?
By the way, a later Tandberg, the TCD 3034, briefly saw a very strange ITT HiFi 3020 rebadge in Germany.
A somewhat slanted thread on audioasylum here, and a timeline of TCDs over here.