5/12/2019 0 Comments Groove Tubes Dual 75 ManualDCP 15 Series offers a 1/16' DIN dual digital process controller. For local indication of process valve and setpoint. Control methods include on/off, PID, self tune and manual tune. This controller offers advanced control features for the most demanding temperature or process application. Groove Tubes' versatile new mics offer a range of facilities to suit every budget. Groove Tubes have been manufacturing a wide range of equipment, mostly involving valve circuitry, for over 20 years. The company also make their own valves at their factory in San Fernando, California. As well as various guitar preamps and amplifiers, equalisers and compressors, they have a growing range of microphones, and six new models were introduced last year. Four large-diaphragm models are reviewed here: the GT55, GT57, GT66 and GT67. The flagship GT67 is a multi-pattern condenser mic with valve electronics, with a fixed-cardioid sibling, the GT66. The GT57 is essentially identical to the GT67, but with FET-based electronics, and the GT55 is its fixed-cardioid relative. The Groove Tubes GT67 valve and GT55 FET mics. Photo: Mark EwingThe GT66 and GT67 mics are supplied in large cardboard carrying cases, and matched pairs (with adjacent serial numbers) are available for stereo applications. ![]() ![]() Each kit contains a valve power supply, an 8m dedicated mic cable, an IEC mains lead, a shockmount, a stand bracket, and the microphone itself. A foam-lined and paper-covered wooden box, which exudes a vintage character all of its own, protects the mic. The PSM1 carries a fused IEC mains inlet at the rear, and a pair of XLR connectors at the front. A red LED indicates power (although this is only visible over a narrow viewing angle), but there is no mains switch, which I found unsatisfactory for both safety and convenience reasons. The mic is connected to the PSU via the bespoke cable with seven-pin XLRs (the user's manual erroneously states it has six pins!), and the mic output is provided on a standard three-pin male XLR socket. Phantom power is not required, but can be tolerated without problems. Groove Tubes GT55, GT57, GT66 & GT67 pros • Classic large-diaphragm performance. • A fine condenser capsule design. • Good standard of construction. • Well-judged valve character or clean FET circuitry. • Configurations to suit all pockets. • Versatile all-rounder mics. Cons • No power switch on valve PSU. • Frustrating design of mounting brackets. Summary An integrated range of true condenser mics with large diaphragms, fixed or switchable polar patterns, and solid-state or valve circuitry. These mics look professional and deliver impressive sound quality, with finely judged characteristics. The plastic stand bracket is fitted with a 3/8 to 5/8-inch thread adaptor (hurrah!) and the microphone sits in a cup on this bracket, retained by a threaded collar. Unfortunately, though, this is not captive and fits from underneath, making it easy to drop and lose. It is also possible to fit the bracket upside-down, making it difficult to tighten the screw collar sufficiently to support the mic properly. For anyone mechanically minded the correct assembly is obvious, but I'm sure many users will be caught out.
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