A little known gem, the IRS e. V. (Studer-Revox Interest Group) is a private association of fans in Hamburg (northern Germany) devoted to preserving the heritage of Willi Studer, died 84 years old on Friday, March 1 1996.
IRS e. V. has a paid membership program including:
- repair and servicing for two devices a year, at the sole cost of parts, no labor costs
- delivery of spare parts at the club’s cost of purchase.
- a two-week preemption right on devices on sales
- discount and warranty on devices on sale
ISR - Studer-Revox Interest Group
The IRS e. V. clubhouse is open during weekdays (and weekends on appointment) for Studer-Revox fans to visit. The IRS e. V. website is here.
The Los Angeles and Orange County Audio Society site hosts an interesting paper describing a step by step procedure for upgrading the B77 and PR99 Revox models for higher playback quality. The document is a work by Arian Jansen of Sonorus Audio. We talked about Sonorus Audio’s
ATR10 tube reel to reel deck here.
The modified machine becomes a playback-only device, addressing hi-end hifi listening, however it is possible to preserve recording functionality by applying only part of the modifications.
The guide contains DIY instruction to perform:
- doubling operating speed up to 15 IPS, for lower speed models (US residents only, due to 60Hz power-supply requirement)
- conversion from NAB to IEC EQ
- upgrading the output capacitors to higher specs components
- removing from signal path the components (a couple of transistors) required for auto-muting, used to suppress audio output during ff/rew operations.
Visit the Los Angeles and Orange County Audio Society site here and the document in pdf format here.