Grundig Studio 600 (Late 1960s–1970s)

The Grundig 600 is a solid-state stereo receiver from the late 1960s, offered into the 1970s. Period directories list it as the Studio 600. The record is a bit split. One source calls it a "stereo receiver," another a "compact amplifier," and the two surviving vendor listings disagree on whether the model name includes "Studio." Both sources agree it was a cleanly built, good-sounding unit for its price class.

The Studio 600 is a fully transistorized Class-AB design with a differential input stage and a cleanly laid-out board. It delivered 2 x 30 Watts at 4 Ohms and roughly 2 x 22-23 Watts at 8 Ohms, with 0.3% total harmonic distortion and a frequency response of 20-20,000 Hz. The phono input accepts 3 mV, high-level inputs 150 mV, and the signal-to-noise ratio is rated at 65 dB. The damping factor is given as 30 (one source says "greater than 30").

There are three inputs: Phono, Tuner, and AUX. Two speaker pairs connect through a large aluminum screw terminal block. A period advertisement highlighted the RTV 350's fully transistorised design and distortion-free bass response Studio Sound (April 1969, p.14). The integrated power supply is described as very cleanly laid out. Dimensions are 470 × 108 × 290 mm, weight is 6.2 kg, and the original price was approximately 498 DM. No production years are precisely documented. One source says it was introduced in the late 1960s, another says it was offered in the 1970s. Both may be true, but the exact run is unconfirmed.

Owners quoted in the two sources praise the workmanship and describe the sound as "pleasantly warm and full." No negative opinions, common failure points, or current used-market prices are documented.