Seven Preamplifier

Seven Preamplifier

Graham has developed a superb little phono stage to partner the Seven line stage resulting in the Seven preamplifier. This is a new design with many unique features built over a long development timeline is search of the most musically satisfying experience. Like all TRON products it relies on the vacuum tube for amplification. We have kept the stages in the Seven to an absolute minimum and have selected valves/tubes that are musically transparent and rich, but also easily obtainable, giving the potential owner the option of using his or her favourite brand, we can advise here on how this affects the musical performance subtly.

 

Features

The Seven Pre comes with 4 line level RCA inputs, a phono input for vinyl replay and a tape loop, as well as the mono/stereo switch, mute switch, earth lift switch, silver RCA sockets and non ferrous case like the Seven Phono and Line. Of course this too is made in the UK. It also has fitted a very high quality Elma selector switch and a close tolerance Noble volume control.
The phono stage featured in the Seven Pre is a brand new design and can be ordered as either MM (48dB gain), MC (68dB) or MC high gain for use with low output cartridges, with 74dB gain. This is is configurable at time of ordering.
The Seven Pre's line stage, being identical to the stand-alone Seven Line, provides up to +15dB of gain. The output stage is a very low impedance high current design, which enables it to be used with any power amplifier, whether transistor or valve. Additional partitioning has been employed internally to help reduce the disruptive effect of magnetic, mechanical and electrical fields for the critical aspects of the circuit. Note: All Sevens can be specified with 20dB, 26dB or a custom MC gain setting at time of ordering.

Specification:
Inputs: 1 RCA Phono input (L & R) & 4 RCA Line inputs (L & R). 
Outputs: 2 RCA main output (L & R) & 1 RCA tape output (L & R).
Valve Complement: 2 × 12AX7 (low noise), 2 × 5687.
Frequency Response: 5Hz–37.5kHz ± 3dB. RIAA within ± 0.5dB
Phono Gain: 48dB – MM. 68dB – MC low gain. 74dB – MC high gain
Equalisation: RIAA.
Line Gain: 15dB.
Output Impedance: <600 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)

Model Options

SEVEN Reference Preamplifier
The Seven Preamplifier stage can be upgraded to the Reference specification to further improve the musical performance from all your musical sources. Graham sources truly unique resistors that in such a simple circuit really bring out a richer and more intimate performance from the artist. We 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. Graham says "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 Preamplifier
The Ultimate is the last but one step towards perfection, and involves the use of solid silver wiring throughout the critical signal path. 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. Graham has redesigned and built 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 recording this is phenomenal. The result is a little like cleaning your windows; you did not necessarily notice they were blocking any light, until afterwards.

Seven GT Preamplifier 
The Seven GT is the final step towards analogue perfection in a full function preamplifier, 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", making the Seven GT preamp to one of the most enjoyable amplifiers in the Tron range.

Seven Phono Stage

Seven Phono Stage

The Seven phono is the first point of entry into the world of Tron phono amplifiers and is used to increase the musical output from your cartridge and to balance the frequency response to the correct RIAA standards, then present a low impedance output to drive your preamplifier or main amplifier. The phono stage is a critical and highly sensitive part of the analogue amplification stage and I have worked over a long period of time to produce a consistently musical and tactile experience treating the delicate musical output from the cartridge with care and respect. I have kept the stages in the Seven phono to an absolute minimum, which is key to maintaining the integrity of the dynamics of such a small signal source and have selected valves/tubes (3 in total) that are both musically open and also easily obtainable so long term listening pleasure with be insured. The Seven phono can be supplied setup for either moving magnet or moving coil cartridges to suit your personal choice. The challenge to deliver truly stunning results from a low output moving coil, and maintain a low noise floor have been worth it, and the moment you place the stylus into the record groove this will become obvious.

 

 

seven
Seven Phono 2

Features

All Seven MC phono stages can be specified with 20dB, 26dB of MC gain. A custom MC gain setting can be specified at time of ordering.
Moving Magnet gain is 49dB.
The coil options are as follows:
+20dB for cartridges with an output of 0.3mV to 0.9mV.
+26dB for cartridges with an output of 0.2mV to 0.3mV.
+30dB for cartridges with an output of 0.1mV to 0.2mV.
+40dB for cartridges with an output of less than 0.1mV.
The output stage has a very low impedance high current output, which enables it to be used with any pre-amp or main amplifier, whether valve or transistor, or even a transformer type volume control (TVC).

Specification:
Inputs: 1 RCA input (L & R). Dual inputs are available on the Reference, Ultimate and GT models. 
Outputs: 1 RCA Phono output (L & R)
Valve Complement: 2 × 12AX7 (low noise), 1 × 5814WA. 
Frequency Response: 5Hz–37.5kHz ± 3dB. RIAA within ± 0.5dB
Gain: 48dB – MM. 68dB – MC low gain. 74dB – MC high gain
Equalisation: RIAA.
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)

Model options

Seven Reference Phono Stage
The Seven Phono stage can be upgraded to the Reference specification to further improve the musical performance from your valuable record collection. Graham painstakingly sources truly unique resistors that in such a simple circuit really bring out a richer and more intimate performance from the artist. We 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. Graham says "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 Phono Stage
The Ultimate is the penultimate step towards analogue perfection, and involves the use of solid silver wiring throughout the critical signal path, and 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. Graham has also redesigned and built a more significant power supply that is unique to audio, which has the effect of making silences darker and dynamic shifts in the music more dramatic. The result is a little like cleaning your windows; you did not necessarily notice they were blocking any light, until afterwards.

Seven GT Phono Stage
The Seven GT 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 to one of the finest phono amplifiers ever made.

Reviews

Tron Seven GT Review - Hi-Fi News March 2013

Confessions of a part-time Audiophile - April 2012

6moons Review - November 2011

6moons Review - November 2006

Seven Mono Phono Stage

Seven Mono Phono Stage

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 

 

 

Features

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 48dB

The 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.

Specification:
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)

 

Upgrade options

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.

Reviews

Seven Line Stage

Seven Line Stage

The Seven Line is a new design with many unique features built over a long development timeline is search of the most musically satisfying experience. Like all TRON products it relies on the vacuum tube for amplification. We have kept the stages in the Seven to an absolute minimum and have selected valves/tubes that are musically transparent and rich, but also easily obtainable, giving the potential owner the option of using his or her favourite brand, we can advise here on how this affects the musical performance subtly.

 

Features

The Seven line stage comes with 5 RCA inputs, mono/stereo switch, mute switch, earth lift switch, silver RCA sockets, non ferrous case and it is all made in the UK. It also has fitted a very high quality Elma selector switch and a close tolerance Noble volume control. The current build of the Seven Line Stage now also features a tape loop.
The output stage is a very low impedance high current design, which enables it to be used with any power amplifier, whether transistor or valve.
The Seven line stage provides up to +15dB of gain.

Specification:
Inputs: 5 RCA Line inputs (L & R).
Outputs: 2 RCA main output (L & R) & 1 RCA tape output (L & R).
Valve Complement: 2 × 5687 (low noise).
Frequency Response: 5Hz–37.5kHz ± 3dB.
Gain: 15dB
Output Impedance: <600 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)

Model Options

SEVEN Reference Line Stage
The Seven Line stage can be upgraded to the Reference specification to further improve the musical performance from all your musical sources. Graham painstakingly sources truly unique resistors that in such a simple circuit really bring out a richer and more intimate performance from the artist. We 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. Graham says "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." The line stage would seem to be a simple amplification task, but this is just not the case if you wish to retain the true musical performance.

SEVEN Ultimate Line Stage
The Ultimate is the last but one step towards perfection, and involves the use of solid silver wiring throughout the critical signal path. 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. Graham has redesigned and built 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 recording this is phenomenal. The result is a little like cleaning your windows; you did not necessarily notice they were blocking any light, until afterwards.

Seven GT Line Stage
The Seven GT Line stage 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 to one of the finest sounding line stages ever made.

Reviews

Report from Confessions of a part-time Audiophile 

Report from Stereophile - Art Dudley 

Report from Stereophile - Ariel Bitran

Seven DAC

Seven DAC

Graham had always preferred the sound of a good analogue source (turntable) to the digital sources with the most illuminating musical performances. For years the concept of improving the performance of a digital source remained a nagging thought in the back of Graham’s mind. What was missing in the conversion of music into digital information, and how could Graham build a solution that did the music justice? The answer could be found in the reverse of this process, the reassembly of the digital signal back into analogue; putting all the pieces back together as music not data. It was clear after listening to all the top high-end CD players over the years that to achieve superlative performance in the digital domain, pretty radical things needed to be done. Basically this involved throwing away the CD red book standard and designing for maximum audio performance without adding or taking anything away. Designing a CD player/DAC to measure to red book standards ironically actually makes it sound poor. It took many years of development and a lot of discussion with digital engineers to solve some of the more fundamental problems of musical integrity that digital reproduction can ultimately lack. The final results are spectacular, as one customer summarised it “this sounds more analogue than any other CD system I have heard, but what I actually mean is more musical and less digitally contrived.”

 

Features

The Seven DAC uses a "state of the art" 16 bit chip. There is no up-sampling, no over-sampling and no digital filter. In other words all the things that interfere and degrade the original 16 bit data stream are removed so the original data is preserved. This is then fed to a really elegant class A tube output stage. Digital replay really doesn't get any better than this.

Specification:
Inputs: 1 RCA input SPDIF & 1 XLR AES/EBU - USB to order. 
Outputs: 1 RCA Phono output (L & R).
Valve Complement: 2 × 6072 (low noise).
Frequency Response: 5Hz–37.5kHz ± 3dB.
Output 1.6volts.
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: 8kg (net)
Warranty: 2 years (parts and labour)

Model Options

Reference
The Seven DAC can be upgraded to the Reference specification to further improve the musical performance from your valuable record collection. Graham painstakingly sources truly unique resistors that in such a simple circuit really bring out a richer and more intimate performance from the artist. We 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. Graham says "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."

Ultimate
The Ultimate is the last but one step towards analogue perfection, and involves the use of solid silver wiring throughout the critical signal path, and silver interstage 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. Graham has also redesigned and built a more significant power supply that is unique to audio, which has the effect of making silences darker and dynamic shifts in the music more dramatic. The result is a little like cleaning your windows; you did not necessarily notice they were blocking any light, until afterwards.

GT 
The Seven GT DAC is the final step towards digital to 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 DAC to one of the finest performing DAC's ever made.