Sonic Frontiers Line-1 Main PCB - Signature Edition
For Sale this gourgeous Sonic Frontiers Line 1 Main PCB, with supply, Tube preamp with balanced designed from input to output.
This is the heart of the original Line-1 preamp, and it is the Signature edition version with tons of upgrade, Vishay VTA-56 and Caddock resistors at key location, Holcos resistors for the rest,
Upgrade bypass MultiCap Capacitor, upgrade rectifier diodes, etc... It was the original Signature upgrade done at the factory. I got this PCB from a former Sonic Frontiers employee years ago.
I made the also the optional Headroom Headphone amplifier, with crossfeed. This PCB uses now NE5532 opamp, OPA2604 shown on picture were reused years ago in other projects.
This preamp has no output coupling capacitors, it uses servo. It would be safer to have a DC detector circuit to and mute the output.
This preamp was controlled by a processor, and needs just a few addition to make it fully functionnal.
This is how I was planning to make it work:
-Input selection done by a rear PCB with relays and rotary switch selector on front. I made the PCB, it is functionnal, all the remaining parts are included. It also includes the Mute relay
-Start up HV relay control and Mute relay control. I made a timer controller PCB, with leds driver, to start the HV after 40sec delay, and then un-mute the output. A front toggle switch is use to control the Munte-Un-Mute. The Multiple Led driver circuit shows the delays, Mute, etc. These leds can be installed on the front as well.
-The original Volume was done by two PGA2311 chips. I have the detailled schematic of this section, two options:
1) use two stereo potentiometers on the front, and control the volume this way, don't use the on-board volume chips.
2) The are plenty of Arduino controller using PGA2311 chips on the net, make your own controller and use the on-board Volume chips. I have the code, and PCB design for one if interested...
I was planning to make a controller but never got there, the simpler solution of two stereo pots can be implemented rapidly and the preamp will be fully fonctionnal
-Front Power On toggle switch to add.
-DC offset detect board to shut down output if the DC detect signal needs to short the output (MUTE) - just in case the output servo ever fails (never done)
So to resume the only parts remaining to complete this preamp are:
-DC offset detect board to shut down output if the DC detect signal needs to short the output (MUTE)
-Chassis
-Front Power-On and Mute Toggle switches
-Front headphone connector.
-Front dual stereo Volume pots
-Knobs.
This is a great preamp, and a great project almost completed. I have all the schematics, detailled Parts List, Silkscreen and schematics of the PCB I made.
So it is easy to complete by an experienced user. The Main PCB was tested and it is fully functionnal.
Too many projects, not enough time to do all them, sorry this one as to go as well...
I have the brand new set of 6 tubes available (EH6822) at an extra costs, tubes are new, used only for the preamp testing.
Kit includes:
-Line 1 Main PCB with supply, complete, fucntionnal, missing two volume chips, Signature Upgrade
-Rear input realys selection and Mute PCB, with front rotary switch, all parts, connectors, switchs,etc included.
-Headroom Headphone Amplifier PCB (with NE5532 op-amp, not with the opamp shown on the picture...)
-Mute and HV Delay with LED control PCB
-All documentation, schematics, BOM
Optional 6 tubes for the preamp Electro Harmonix 6922EH, brand new (31U$ each at Parts Connexion)
Asking 500U$ for the kit + Shipping + Paypal 3.5% fee (Just in parts, this PCB is worth way more than that...)
possible to buy the 6 tubes set as well for an extra 125U$ (more than 215U$ if you buy them...)
Thanks for looking
SB
For Sale this gourgeous Sonic Frontiers Line 1 Main PCB, with supply, Tube preamp with balanced designed from input to output.
This is the heart of the original Line-1 preamp, and it is the Signature edition version with tons of upgrade, Vishay VTA-56 and Caddock resistors at key location, Holcos resistors for the rest,
Upgrade bypass MultiCap Capacitor, upgrade rectifier diodes, etc... It was the original Signature upgrade done at the factory. I got this PCB from a former Sonic Frontiers employee years ago.
I made the also the optional Headroom Headphone amplifier, with crossfeed. This PCB uses now NE5532 opamp, OPA2604 shown on picture were reused years ago in other projects.
This preamp has no output coupling capacitors, it uses servo. It would be safer to have a DC detector circuit to and mute the output.
This preamp was controlled by a processor, and needs just a few addition to make it fully functionnal.
This is how I was planning to make it work:
-Input selection done by a rear PCB with relays and rotary switch selector on front. I made the PCB, it is functionnal, all the remaining parts are included. It also includes the Mute relay
-Start up HV relay control and Mute relay control. I made a timer controller PCB, with leds driver, to start the HV after 40sec delay, and then un-mute the output. A front toggle switch is use to control the Munte-Un-Mute. The Multiple Led driver circuit shows the delays, Mute, etc. These leds can be installed on the front as well.
-The original Volume was done by two PGA2311 chips. I have the detailled schematic of this section, two options:
1) use two stereo potentiometers on the front, and control the volume this way, don't use the on-board volume chips.
2) The are plenty of Arduino controller using PGA2311 chips on the net, make your own controller and use the on-board Volume chips. I have the code, and PCB design for one if interested...
I was planning to make a controller but never got there, the simpler solution of two stereo pots can be implemented rapidly and the preamp will be fully fonctionnal
-Front Power On toggle switch to add.
-DC offset detect board to shut down output if the DC detect signal needs to short the output (MUTE) - just in case the output servo ever fails (never done)
So to resume the only parts remaining to complete this preamp are:
-DC offset detect board to shut down output if the DC detect signal needs to short the output (MUTE)
-Chassis
-Front Power-On and Mute Toggle switches
-Front headphone connector.
-Front dual stereo Volume pots
-Knobs.
This is a great preamp, and a great project almost completed. I have all the schematics, detailled Parts List, Silkscreen and schematics of the PCB I made.
So it is easy to complete by an experienced user. The Main PCB was tested and it is fully functionnal.
Too many projects, not enough time to do all them, sorry this one as to go as well...
I have the brand new set of 6 tubes available (EH6822) at an extra costs, tubes are new, used only for the preamp testing.
Kit includes:
-Line 1 Main PCB with supply, complete, fucntionnal, missing two volume chips, Signature Upgrade
-Rear input realys selection and Mute PCB, with front rotary switch, all parts, connectors, switchs,etc included.
-Headroom Headphone Amplifier PCB (with NE5532 op-amp, not with the opamp shown on the picture...)
-Mute and HV Delay with LED control PCB
-All documentation, schematics, BOM
Optional 6 tubes for the preamp Electro Harmonix 6922EH, brand new (31U$ each at Parts Connexion)
Asking 500U$ for the kit + Shipping + Paypal 3.5% fee (Just in parts, this PCB is worth way more than that...)
possible to buy the 6 tubes set as well for an extra 125U$ (more than 215U$ if you buy them...)
Thanks for looking
SB
Attachments
Last edited:
Bump, can't believe no one is interested in this kit. At a fraction of a price you'll get a killing balanced tube preamp.
I heard the original in a very high end system, Wilson Audio speaker, Audio Research DAC and Transport, Classé Amplifier, and it sound faboulous.
At this price it is not even covering the price of all thehigh ends parts on the board.
Also the main PCB also include the sophisticated multi section power supply, with a very high quality Plitron custom power transformer.
Just the transformer would cost easily 200$ custom mada on order, if Plitorn would still accept individual order, which they don't
Would really like to find a new home for this grear kit.
Thanks for looking
SB
I heard the original in a very high end system, Wilson Audio speaker, Audio Research DAC and Transport, Classé Amplifier, and it sound faboulous.
At this price it is not even covering the price of all thehigh ends parts on the board.
Also the main PCB also include the sophisticated multi section power supply, with a very high quality Plitron custom power transformer.
Just the transformer would cost easily 200$ custom mada on order, if Plitorn would still accept individual order, which they don't
Would really like to find a new home for this grear kit.
Thanks for looking
SB
Another option for volume control on this would be a balanced 4-ch pot. A very good one is the TKD 4CP2500, which you can find here: https://www.hificollective.co.uk/potentiometers/tkd-potentiometer.html
Ebay seller familygate often has 4 ch. Alps Blue RK27 pots as well: https://www.ebay.com/str/familygate
Ebay seller familygate often has 4 ch. Alps Blue RK27 pots as well: https://www.ebay.com/str/familygate
Hi, New deal for this New Year, since it doesn't seem to have much interest for the many upgrades done on this pcb (done originally by Sonic Frontiers themself!), I removed most of the Multicap upgrade caps, and put back more mundane parts such as Wima, Siemens, CDE, Panasonic film caps.
There are still all the Vishay Foil and Caddock and Mills upgrade resistors in place.
Complete functional kit with all the needed parts, connectors, as shown on the first post, without the tubes and headphone crossfeed optional pcb op-amps, now
Asking 350U$ for the kit + Shipping + Paypal 3.5% fee
That probably close to the price of only the custom Plitron power transformer, for the price you have a full balanced tube preamp...
There are still all the Vishay Foil and Caddock and Mills upgrade resistors in place.
Complete functional kit with all the needed parts, connectors, as shown on the first post, without the tubes and headphone crossfeed optional pcb op-amps, now
Asking 350U$ for the kit + Shipping + Paypal 3.5% fee
That probably close to the price of only the custom Plitron power transformer, for the price you have a full balanced tube preamp...
Hi, Too late, preamp kit is now packed in prevision for out move, and probably won't be available within 1-2 years...
Thread Closed...
SB
Thread Closed...
SB