The Seven Mono phono stage has been made available so audiophiles can enjoy their collection of mono recordings with the maximum fidelity that only a specifically designed mono phono stage can offer.
Note: the image shows two Mono Sevens being used as a stereo phono stage.
Why a mono phono stage?
Pre-1957 record companies used different recording equalisations prior to the introduction of the RIAA standard. We have developed this phono stage to allow more faithful reproduction of these early recordings. The Seven is equipped with three switchable equalisations which the owner can specify during the order process.
Modern mono cartridges often do not work well with stereo phono stages, noise and gain are the biggest problems. This is because stereo phono stages are designed and constructed to receive a stereo signal rather than a mono signal.
If you have heard a true high fidelity mono recording through a Seven Mono phono stage you will notice the sheer immediacy and dynamics that prevails. Many TRON customers actively seek out mono recordings as they are addicted to the unique sound that can be achieved.
To see and hear a stereo/mono demonstration please click this link
The Seven Mono phono stage can be specified with 48dB, 68dB and 74dB of gain (overall gain), or a custom MC gain setting can be accommodated at time of ordering.
Different levels of gain are available to match the output of your mono cartridge, in particular the Miyajima Labs Mono cartridges. The Seven Phono stage both stereo & mono are completely customisable and upgradeable.
The coil option can be matched to the cartridge with the following levels of gain:
Moving Magnet gain is 48dBThe Moving Coil option can be matched to the cartridge with the following levels of gain:
1) +20dB (68dB overall) for cartridges with an output of 0.3mV to 0.7mV.
2) +26dB (74dB overall) for cartridges with an output of 0.1mV to 0.3mV.
3) Up to +40dB of gain (88dB overall) is available depending on customers cartridge.
Any of these options can be specified during the ordering process including a lower value of gain.
Inputs: 1 RCA input (L & R). Another input can be included if required making 2 phono inputs.
Outputs: 1 RCA Phono output (L & R)
Valve Complement: 1 × 12AX7 (V1) low noise, 1 × 5814WA (V2)
Frequency Response: 5Hz–37.5kHz ± 3dB. RIAA within ± 0.5dB
Gain: 48dB – MM. 68dB – MC low gain. 74dB – MC high gain
Equalisation: RIAA, CCIR & FFRR (EMI LP option as well as any other EQ requested)
Output Impedance: <1000 Ohms
Mains Supply: 115–240 volts AC (50–60Hz). Earth lift included.
Power Consumption: Nominal 12 watts
Dimensions (mm): 450w × 103h × 335d
Weight: 7kg (net)
Warranty: 2 years (parts and labour)
Seven Reference Mono Phono Stage
The Seven Mono Phono stage can be upgraded to the Reference specification to further improve the musical performance from your valuable record collection. I build the amplifier with some difficult to source and truly unique resistors that in such a simple circuit really bring out a richer and more intimate performance from the artist. I have also upgraded the capacitors to a custom specification to work in harmony with the improved resistors; as in most development activities changing one thing in isolation hardly ever results in a balanced improvement. It never ceases to amaze me how improving one component can impact the music in such a significant way, and also how long it takes to find the right combination to retain true harmony.
Seven Ultimate Mono Phono Stage
The Ultimate is the last but one step to analogue perfection, and involves the use of solid silver wiring throughout the critical signal path, and also silver MC transformers. Silver as a conductor has the advantage of a more revealing and transparent reproduction of the music, however care needs to be taken to ensure that this is delivered in a complete and unified manner as sections of silver in a component in isolation rarely provide a benefit. Finding the right dielectric (insulation) for the cables is also critical to extract the best from this expensive material. I have also redesigned and build a more significant power supply that is unique to audio, which has the effect of making silences darker and dynamic shifts in the music even more dramatic, and with a good mono recording this can be truly captivating. The result is a little like cleaning your windows; you did not necessarily notice they were blocking any light, until afterwards.
Seven GT Mono Phono Stage
The Seven GT mono is the final step towards analogue perfection, and involves the use of a completely new power supply circuit for all the critical stages. Graham says this power supply was 5 years in the making and makes a huge improvement in fidelity taking the Seven GT mono to one of the finest mono phono amplifiers ever made.
Stereo/Mono Phono demonstration – AV Showrooms
6moons review – November 2006