Company Background : Sun Valley Co., Ltd. [100% subsidiary of Toyota Industries Corporation]
Product specification
SV-S1628D Kit US$1700.00
SV-S1628D 4 X VCAP ODAM installed - Made and Assembled in Japan US$2,350.00
Type: 845/211 Single power amplifier
Input: Line 1 end with volume
Wiring specification: Hand wiring (power supply
part, BIAS adjuster, hum balancer is a circuit board)
SP impedance: 8Ω (4Ω or 16Ω setting is also available)
Vacuum tube: 845 or 211×2, 12BH7A×2, 12AU7×2
(*vacuum tubes are sold separately)
Rated output: more than 845/16W+16W
more than 211/7.5W+7.5W (8Ω, THD: 10%)
Frequency characteristic: 15Hz~60kHz(1W/8Ω/-3dB)
Gain: 845/25dB, 211/26dB (at 8Ω)
Size: W410xD275xH240(mm)
*including height of vacuum tube. No cage/cover.
Weight 15KG
Victor,
Some initial impressions….
The Sun Valley 211/845 amp is an elegant and beautifully designed audio component.
There are many things which are immediately apparent:
The materials are excellent, the finish of the Chassis is perfect and the coating is unusual, refined and almost indestructible. Very Nice.
This is s kit which has clearly gone through years of refinement and focus to obtain the highest level of performance. The circuits are designed with elegance and performance with dozens of notable features:
1. All of the passive components are very well specified and uniquely employed to provide the highest performance and durability. For example, the power supply employs very closely matched metal resistors for precis voltages while the audio path specifies carbon resistors, favored by manty including myself, for the audio path.
2. Extremely high quality multi strand internally tinned wire is supplied at various gauges optimized for the power and audio circuits.
3. The power transformer and filament filter/power supply design is VERY robust and can supply any 211/845 with stable well filtered power.
4. The main power supply board is designed to provide exceptional stability and filtration and separately address Blow voltage standby, and fixed bias reference voltages…very nice.
This build will be very different from anyone solely familiar with pre-printed circuit boards and step by step check box style instructions. The documentation is quite adequate, very precise and compact delivering all of the required information and guidelines BUT it is very important that the builder has noted all of the specifications and subcomponent relationships prior to the build… i.e. Know what the designers intended, why the approach the construction as they do and pay attention to the details.
Going through the instruction for the first few pages I made a few illustrative notes.
1. Note the sequence for construction and you will begin to get a feel for the relationship among the sub-assemblies and why, in many cases the parts specification is very specific.
2. The Parts list on page 6, describes not only the individual parts, but the subassemblies for which they were provided. Unlike many manufactures, Sun Valley does not package their components separately for each sub-assembly but has grouped them by component type. Thus for the Bias board the circuit board, potentiometers, connection block and resistors are all packaged in different locations but carefully packaged and verified by quality control (you will find an inspection sheet in the packaging to assure you receive all that is required. .
3. Note that you must know how components are coded, where they go or carefully follow the specifications on the parts index (pages 5-6) Sun valley does not print component values on the circuit boards (but does specify part designation relative to the parts list and schematic) and you need to attend to assuring that you employ the correct value, capacity and type of component. Resistor packs for example contain the resistors for several sub-assemblies in various wattages).
4. Mechanical assembly employs very high quality hardware with the capacity to make small adjustments to account for manufacturing variability in parts so you can obtain a perfect and symmetrical build. For example, there is just enough play in the M3 securing hardware for the tube sockets and bias boards to allow alignment of these assemblies in the exact center of the chassis holes for a perfect build and very attractive final product.
You are correct, the sound is incredible. Very beautiful design, excellent quality components; I made a few upgrades and small changes but basically and Very Well Designed.
Great and very specific guidelines for initial check and all measurements were within 3% of the reference voltages.
The sound is incredible and the power supply design, allowing a full warm up prior to applying B+ is exceptional.
I would love to comment on the noise floor... but I could not find any noise!!
This is a very quiet and refined component
"This was an interesting build. This amp is best built from the schematic with reference to the diagrams for component locations and wire routing suggestions ( I modified some of these to minimize hum). This amp has an awesome powers supply and with high quality components offers great flexibility for refinement. "
Product specification
SV-S1628D Kit US$1700.00
SV-S1628D 4 X VCAP ODAM installed - Made and Assembled in Japan US$2,350.00
Type: 845/211 Single power amplifier
Input: Line 1 end with volume
Wiring specification: Hand wiring (power supply
part, BIAS adjuster, hum balancer is a circuit board)
SP impedance: 8Ω (4Ω or 16Ω setting is also available)
Vacuum tube: 845 or 211×2, 12BH7A×2, 12AU7×2
(*vacuum tubes are sold separately)
Rated output: more than 845/16W+16W
more than 211/7.5W+7.5W (8Ω, THD: 10%)
Frequency characteristic: 15Hz~60kHz(1W/8Ω/-3dB)
Gain: 845/25dB, 211/26dB (at 8Ω)
Size: W410xD275xH240(mm)
*including height of vacuum tube. No cage/cover.
Weight 15KG
Victor,
Some initial impressions….
The Sun Valley 211/845 amp is an elegant and beautifully designed audio component.
There are many things which are immediately apparent:
The materials are excellent, the finish of the Chassis is perfect and the coating is unusual, refined and almost indestructible. Very Nice.
This is s kit which has clearly gone through years of refinement and focus to obtain the highest level of performance. The circuits are designed with elegance and performance with dozens of notable features:
1. All of the passive components are very well specified and uniquely employed to provide the highest performance and durability. For example, the power supply employs very closely matched metal resistors for precis voltages while the audio path specifies carbon resistors, favored by manty including myself, for the audio path.
2. Extremely high quality multi strand internally tinned wire is supplied at various gauges optimized for the power and audio circuits.
3. The power transformer and filament filter/power supply design is VERY robust and can supply any 211/845 with stable well filtered power.
4. The main power supply board is designed to provide exceptional stability and filtration and separately address Blow voltage standby, and fixed bias reference voltages…very nice.
This build will be very different from anyone solely familiar with pre-printed circuit boards and step by step check box style instructions. The documentation is quite adequate, very precise and compact delivering all of the required information and guidelines BUT it is very important that the builder has noted all of the specifications and subcomponent relationships prior to the build… i.e. Know what the designers intended, why the approach the construction as they do and pay attention to the details.
Going through the instruction for the first few pages I made a few illustrative notes.
1. Note the sequence for construction and you will begin to get a feel for the relationship among the sub-assemblies and why, in many cases the parts specification is very specific.
2. The Parts list on page 6, describes not only the individual parts, but the subassemblies for which they were provided. Unlike many manufactures, Sun Valley does not package their components separately for each sub-assembly but has grouped them by component type. Thus for the Bias board the circuit board, potentiometers, connection block and resistors are all packaged in different locations but carefully packaged and verified by quality control (you will find an inspection sheet in the packaging to assure you receive all that is required. .
3. Note that you must know how components are coded, where they go or carefully follow the specifications on the parts index (pages 5-6) Sun valley does not print component values on the circuit boards (but does specify part designation relative to the parts list and schematic) and you need to attend to assuring that you employ the correct value, capacity and type of component. Resistor packs for example contain the resistors for several sub-assemblies in various wattages).
4. Mechanical assembly employs very high quality hardware with the capacity to make small adjustments to account for manufacturing variability in parts so you can obtain a perfect and symmetrical build. For example, there is just enough play in the M3 securing hardware for the tube sockets and bias boards to allow alignment of these assemblies in the exact center of the chassis holes for a perfect build and very attractive final product.
You are correct, the sound is incredible. Very beautiful design, excellent quality components; I made a few upgrades and small changes but basically and Very Well Designed.
Great and very specific guidelines for initial check and all measurements were within 3% of the reference voltages.
The sound is incredible and the power supply design, allowing a full warm up prior to applying B+ is exceptional.
I would love to comment on the noise floor... but I could not find any noise!!
This is a very quiet and refined component
"This was an interesting build. This amp is best built from the schematic with reference to the diagrams for component locations and wire routing suggestions ( I modified some of these to minimize hum). This amp has an awesome powers supply and with high quality components offers great flexibility for refinement. "
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You mean the Sun Valley ? I thought it was built. Thanks.
And in terms of material quality and sound quality ? Thanks again 🙂
And in terms of material quality and sound quality ? Thanks again 🙂
You mean the Sun Valley ? I thought it was built. Thanks. ----->No it is a point to point kit
And in terms of material quality and sound quality ? ------> Sun valley is a made in Japan.. The material is very good.. both OPT and power transformer are made in Japan
And in terms of material quality and sound quality ? ------> Sun valley is a made in Japan.. The material is very good.. both OPT and power transformer are made in Japan
thank you sir !
I will have to "study" and see what would be the best for me... A top Elekit from you or this one.
I need to know more and see if I have the ears to see and note the difference.
I will have to "study" and see what would be the best for me... A top Elekit from you or this one.
I need to know more and see if I have the ears to see and note the difference.
Plate voltage
Hello Victor,
Could you tell me the operating plate voltage of the 845 tubes in this circuit?
Thank you.
Matt
Hello Victor,
Could you tell me the operating plate voltage of the 845 tubes in this circuit?
Thank you.
Matt
Can you say more about this kit? Compare to the Elekit's? I do not know which kit I want will buy... I'm looking for a lot of warm sound.
I have 2 questions for you.
1. the B+ is 900V. Are you ok to handle 900V+ ?
2. This amp is a point to point amp. It requires more skill. Are you ok to build point to point?
1. the B+ is 900V. Are you ok to handle 900V+ ?
2. This amp is a point to point amp. It requires more skill. Are you ok to build point to point?
Hum, 900V, maybe... If I have a good manual instructions, I can make it. But I read so much good things about Elekit, I think I will choose one of them. Can I hear the TU-8200 vs TU-8600 in Montreal? Will you be present at Le Salon de l'audio in marsh 2019? I really want to hear that!
I have the English Manual for Sunvalley
You must have the knowledge to handle 900 B+. It is too dangerous.
If you compare TU-8200 to TU-8600, we are comparing Toyota Yaris to 4-Runner.
I am not sure at this time
You must have the knowledge to handle 900 B+. It is too dangerous.
If you compare TU-8200 to TU-8600, we are comparing Toyota Yaris to 4-Runner.
I am not sure at this time