Orban 621-B
The 621-B is a two-channel parametric equaliser from Orban Parasound, built for professional studio use. Most of what survives about it is the company's own advertising. Studio Sound (October 1975, p.9) carried an Orban ad listing the 621-B at under £400 UK list and calling it the most cost-effective professional equaliser then available. That's a manufacturer's claim, but it gives a fixed point for pricing and positioning.
The ads describe a well-specified unit for the mid-1970s. It has two fully independent channels. Each channel has four overlapping bands covering a 4.3-octave range per band, with continuously variable tuning, level, and bandwidth controls. Maximum boost was 16 dB, with cut to minus infinity. Orban stressed "constant Q" rather than reciprocal equalisation curves, saying the extremes of EQ stayed musically useful instead of peaky and ringy. The front panel had click-free in/out switching and LED overload indicators.
Independent editorial documentation of the 621-B is thin in the archive, so the record here is essentially those advertisements. By September 1977 Orban was advertising the Model 622B as the 621-B's successor, and called the older model much praised (Studio Sound, September 1977, p.14). The 622B ad lists per-band in/out switching and an internal power supply as improvements. That hints at where the 621-B was lighter on features, though the 621-B ads themselves don't spell those details out.
- Two independent channels, four overlapping bands each
- Each band covers a 4.3-octave range
- Continuously variable tuning, level, and bandwidth controls
- Up to 16 dB boost; cut to minus infinity
- Constant Q curves; click-free in/out; LED overload indicator
- Advertised at less than £400 UK list (1975)
Similar items on eBay
No exact Orban 621-B listings are live right now — these searches show current Orban and similar vintage audio gear on eBay:
As an eBay Partner, we earn from qualifying purchases. This helps support our independent vintage technology research.