The Stam Audio SA-V72-5 is a faithful replica of the vintage German Telefunken V72 tube preamp in a 500-series format.
The History: The V72 was originally developed in the late 1940s for German radio broadcast as a fixed gain microphone preamplifier. It’s big, rich sound led to it being incorporated into recording studios around the world, most notably used by the Beatles in the famous REDD 37 console, as well as by companies like EMI and Decca in their house studios.
The original unit has an appearance consistent with its times, being a solid metallic block with little in the way of interface. The Stam Audio replica, the SA-72-5, combines the classic sound of the V72 with a modern interface for the best of both worlds for the user, without any compromise in sound.
The Engineering: Strictly following the original design the SA-V72-5 uses a Sowter input transformer with the original ratio (50+50/47K) with the option to select HI-Z 50 ohms (1:20) or 200 ohms (1:10), after passing through the input transformer the audio signal is amplified by two NOS EF86 tubes that in conjunction with high quality passive components provide us with an authentic tube sound and extremely rich harmonic distortion (THD), finally the audio passes by a Sowter output transformer with the same frequency response and ratio as the original (76k/600ohms) with everything being filtered by a critical Sowter choke which provides the necessary linearity for the correct functioning of the V72 preamp. The unit delivers a whopping 52 dB with a design capable of delivery the necessary voltage e in a convenient 500 series format.
Features: The SA-72-5 can be mounted in a 500 series chassis. It features an adjustable gain control, an output trim pot, 48v phantom power, reverse polarity and a high impedance switch, all of which add to the versatility of the original. There is also a front mounted DI input. The original unit was also not configured for modern connections and required further components to interface with modern audio connectors, however as a 500 series unit, the SA-72-5 is ready to go.
Components: We have used the finest quality EH EF86 tubes to recreate the size and richness of the original mic pre sound. The unit has Ohmite carbon resistors, Vishay capacitors and 1% precision matches resistors. We also utilize a Sowter input and output transformers, as well as a Sowter choke, handmade in the UK. Although the most expensive transformers available, they are also by far the best sounding ones. It is on these points that other replicas choose to make savings or utilize more commonly available components, however our extensive research and testing has found our own approach to produce the finest sonic match to the original.
ZERO COMPROMISE. SURPRISINGLY AFFORDABLE.
Stam Audio Engineering products are about sound quality first and foremost. Every component of every single unit is premium quality and carefully selected to ensure our units match or even surpass the quality of high end boutique-gear.
So when you see the price for the SA-72-5 your first thought will probably be: “how is this possible?”
We have made the bold decision to bypass distributors and retailers and use the typical 30% margin on quality components. Whilst we inherit a slightly smaller reach without distribution, we conversely can afford to have a large budget for parts, allowing us to build a better product at a better price than any alternative offerings across all of our product range. Better components mean better recordings.
We are Stam Audio’s only distributor