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2A3 Single Ended Output Transformers (Pair) – 20W Audiophile Grade 1

2A3 Single Ended Output Transformers (Pair) – 20W Audiophile Grade

Item CodeSE-2A3-OPT- 20W

310,00 €

2A3 Single Ended Output Transformers – Handmade by Thermionic Lab The Thermionic Lab 2A3 Single...

2A3 Single Ended Output Transformers (Pair) – 20W Audiophile Grade

2A3 Single Ended Output Transformers – Handmade by Thermionic Lab

The Thermionic Lab 2A3 Single Ended Output Transformers are designed for uncompromising audiophile performance and exceptional musicality. Handcrafted using premium European CRGO silicon steel cores and precision winding techniques, these transformers deliver outstanding bandwidth, transparency, and harmonic detail for high-end vacuum tube amplifiers.

Designed specifically for single-ended tube amplifier applications, these 20W output transformers provide excellent low-frequency extension, smooth high-frequency response, and ultra-low distortion characteristics.

Key Features

Handmade audiophile-grade output transformers
Designed for 2A3 single-ended tube amplifiers
20W maximum output power
Wide frequency response: 5Hz – 50kHz (-3dB)
Premium European CRGO silicon steel core
Ultra-linear tap configuration ,or secondary load matches on request
Optimized for high-end Hi-Fi systems
Excellent harmonic balance and soundstage
Ultra-low distortion design

Technical Specifications

Primary Impedance: 2K5
Secondary Impedance: 4/8Ω
Primary Inductance: 30H @ 17Vrms / 50Hz
Air gap set for: 80mA
Maximum DC current: 250mA
Frequency Response: 5Hz – 50kHz (-3dB)
Core Material: High quality CRGO silicon steel M6
Core Size: EI84 / 50
Dimensions: 82mm x 75mm x 87mm
Weight: 2.32kg per transformer

Thermionic Lab transformers are trusted by demanding audiophiles and tube amplifier builders worldwide for their exceptional sonic performance and craftsmanship.

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2A3 Single Ended Output Transformers (Pair) – 20W Audiophile Grade

2A3 Single Ended Output Transformers – Handmade by Thermionic Lab

Key Features

Handmade audiophile-grade output transformers
Designed for 2A3 single-ended tube amplifiers
20W maximum output power
Wide frequency response: 5Hz – 50kHz (-3dB)
Premium European CRGO silicon steel core
Ultra-linear tap configuration ,or secondary load matches on request
Optimized for high-end Hi-Fi systems
Excellent harmonic balance and soundstage
Ultra-low distortion design

Technical Specifications

Primary Impedance: 2K5
Secondary Impedance: 4/8Ω
Primary Inductance: 30H @ 17Vrms / 50Hz
Air gap set for: 80mA
Maximum DC current: 250mA
Frequency Response: 5Hz – 50kHz (-3dB)
Core Material: High quality CRGO silicon steel M6
Core Size: EI84 / 50
Dimensions: 82mm x 75mm x 87mm
Weight: 2.32kg per transformer

Thermionic Lab transformers are trusted by demanding audiophiles and tube amplifier builders worldwide for their exceptional sonic performance and craftsmanship.

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GM70 SE Output Transformer 8K:8R 45W

GM70 Single Ended Output Transformer(Pair) 45W,

Designed for use with GM70 tubes

TECHNICAL FEATURES:

Primary Impedance: 8K

Secondary Impedance:8 Ω

Primary Inductance Lp=80H

airgap set for : 100mA (customizable up to 120mA)

Primary DC resitance:289R

Max Dc current :250mA

Maximum output power :45W

Frequency Response: 5Hz-50Khz -3dB

core material:High quality Annealed CRGO silicon steel M6 ,made in Europe

core size : EI 120/70 ,

lamination thickness /0.35mm

Weight:6.2Kgr per transformer

Winding method :layer wound with insulation

Winding Wire: Double coated Grade 2 enamelled copper wire made in Europe Wound in Precision Multi section winding, for reduced leakage inductance and high dielectric strength.

Mounting: Vertical End bells

All transformers are tested in real working tube amplifiers before shipping.

Tube amplifier projects and related circuits use high voltage and contact with high voltages can cause serious injury or death.

If you are not experienced with high voltage safety and working with high voltage, this is not the project for you and you act at your own risk and responsibility.

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845 SE Output Transformer 10K:8R 45W

845 Single Ended Output Transformer(Pair) 45W,

Designed for use with 845 tubes

TECHNICAL FEATURES:

Primary Impedance: 10K

Secondary Impedance:8 Ω

Primary Inductance Lp=85H

airgap set for : 80mA (customizable up to 120mA)

Primary DC resitance:309R

Max Dc current :250mA

Maximum output power :45W

Frequency Response: 5Hz-50Khz -3dB

core material:High quality Annealed CRGO silicon steel M6 ,made in Europe

core size : EI 120/80 ,

lamination thickness /0.35mm

Weight:7Kgr per transformer

Winding method :layer wound with insulation

Winding Wire: Double coated Grade 2 enamelled copper wire made in Europe Wound in Precision Multi section winding, for reduced leakage inductance and high dielectric strength.

Mounting: Vertical End bells

All transformers are tested in real working tube amplifiers before shipping.

Tube amplifier projects and related circuits use high voltage and contact with high voltages can cause serious injury or death.

If you are not experienced with high voltage safety and working with high voltage, this is not the project for you and you act at your own risk and responsibility.

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211 SE Output Transformer 12K:8R 45W

211 Single Ended Output Transformer(Pair) 45W,

Designed for use with 211 tubes ,can deliver up to 45 watts in class A2

TECHNICAL FEATURES:

Primary Impedance: 12K

Secondary Impedance:8 Ω

Primary Inductance Lp=90H

airgap set for : 60mA (customizable up to 80mA)

Primary DC resitance:289R

Max Dc current :250mA

Maximum output power :45W

Frequency Response: 5Hz-51Khz -3dB

core material:High quality Annealed CRGO silicon steel M6 ,made in Europe

core size : EI 120/70 ,

lamination thickness /0.35mm

Weight:6.2Kgr per transformer

Winding method :layer wound with insulation

Winding Wire: Double coated Grade 2 enamelled copper wire made in Europe Wound in Precision Multi section winding, for reduced leakage inductance and high dielectric strength.

Mounting: Vertical End bells

All transformers are tested in real working tube amplifiers before shipping.

Tube amplifier projects and related circuits use high voltage and contact with high voltages can cause serious injury or death.

If you are not experienced with high voltage safety and working with high voltage, this is not the project for you and you act at your own risk and responsibility.

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Item Code

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6C33 SE Output Transformer 600R:4/8R 60W

6C33 Single Ended 600K:4-8R Output Transformer(Pair) 60W Designed for 6C33 tube or paralleled tubes

TECHNICAL FEATURES:

Primary Impedance: 600R

Secondary Impedance:4/8 Ω

Primary Inductance Lp=8H @17Vrms/50hz /200mA dc

airgap set for : 200mA up to 400mA (on request )

Primary DC resitance:27R

Max Dc current :500mA

Maximum output power :60W

Frequency Response: 6.4Hz-75Khz -3dB , Rsource =100R

Leakage inductance:1.3mH/1khz

core material:High quality CRGO silicon steel M6 , DIN EN 10107 ,made in Europe

core size : EI 120/60 , lamination thickness /0.35mm

Weight:6Kgr per transformer

Winding method :layer wound with insulation insertion between every layer.

Winding Wire: Double coated Grade 2 enamelled copper wire made in Europe Wound in Precision Multi section winding, for reduced leakage inductance and high dielectric strength.

Mounting: Vertical All transformers are tested in real working tube amplifiers before shipping.

Tube amplifier projects and related circuits use high voltage and contact with high voltages can cause serious injury or death.

If you are not experienced with high voltage safety and working with high voltage, this is not the project for you and you act at your own risk and responsibility.

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300B Upgrade Output transformer for Willsenton R300 Amplifier (Pair)

TECHNICAL FEATURES:

Primary Impedance: 4K

Secondary Impedance:8 Ω

Primary Inductance Lp=39H @17Vrms/50hz /90mA dc

Leakage inductance : 3.9mH

airgap set for : 90 mA

Primary Dc resistance: 179 Ohm

Max Dc current :300mA

Maximum output power :25W

Frequency Response: 12Hz-35Khz -1dB (Rsource=820R)

8Hz-66Khz -2dB

4.8Hz-110Khz -3dB

core material: High quality CRGO silicon steel M6 (19000Gauss) , DIN EN 10107 ,made in Europe

core size : EI 96/60

lamination thickness /0.35mm

dimensions:129mmx100mmx81mm

weight :3.5Kgr per transformer

Winding method :layer wound with insulation insertion between every layer.

Winding Wire: Double coated Grade 2 enameled copper wire made in Europe Wound in Precision Multi section winding, for reduced leakage inductance and high dielectric strength.

Mounting:Vertical/Horizontal Open Rrame ,ready for pottinng .

Customizable Endbell Option also available.

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Single Ended 5K:8R 35W Ultralinear Output Transformers (Pair)

Single Ended 5K:8R Output Transformer(Pair) 35W, ultralinear

Designed for EL34 6L6 KT88 6550 in triode or ultralinear mode or paralleled 845 tubes

TECHNICAL FEATURES:

Primary Impedance: 5K

Secondary Impedance:8 Ω

ultralinear tap :37% ( or23% -42% on request)

airgap set for : 80 -250mA (on request)

Primary DC resitance:102R

Max Dc current :350mA

Maximum output power :35W

Frequency Response: 6.4Hz-40Khz -3dB ,

Leakage inductance:5.19mH/1khz

core material:High quality CRGO silicon steel M6 , DIN EN 10107 ,made in Europe

core size : EI 120/60 ,

lamination thickness /0.35mm

Weight:5.8Kgr per transformer

Winding method :layer wound with insulation insertion between every layer.

Winding Wire: Double coated Grade 2 enamelled copper wire made in Europe Wound in Precision Multi section winding, for reduced leakage inductance and high dielectric strength.

Mounting: Vertical

All transformers are tested in real working tube amplifiers before shipping. Tube amplifier projects and related circuits use high voltage and contact with high voltages can cause serious injury or death.

If you are not experienced with high voltage safety and working with high voltage, this is not the project for you and you act at your own risk and responsibility.

Name*

Email*

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Item Code

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Single Ended 5K:4/8R 25W Ultralinear Output Transformers EndBells (Pair)

TECHNICAL FEATURES:

Primary Impedance: 5K

Secondary Impedance:4/8 Ω

ultralinear tap :42% ( or23% -33% on request)

Primary Inductance Lp=39H @17Vrms/50hz /80mA dc

Leakage inductance : 10mH

airgap set for : 80-120mA (οn request)

Primary Dc resistance: 229 Ohm

Max Dc current :160mA

Maximum output power :25W

Frequency Response:

16Hz-22Khz -1dB (Rsource=5k)

12Hz-33Khz -2dB

core material:High quality CRGO silicon steel M6 (19000Gauss), DIN EN 10107 ,made in Europe

core size : EI 96/50

lamination thickness /0.35mm

dimensions:119mmx100mmx81mm

weight :3Kgr per transformer

Winding method :layer wound with insulation insertion between every layer.

Winding Wire: Double coated Grade 2 enamelled copper wire made in Europe Wound in Precision Multi section winding, for reduced leakage inductance and high dielectric strength.

Mounting:End bells for Vertical placement

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Single Ended 3K5:4/8R 25W Ultralinear Output Transformers EndBells (Pair)

TECHNICAL FEATURES:

Primary Impedance: 3K5

Secondary Impedance:4/8 Ω

ultralinear tap :42% ( or23% -33% on request)

Primary Inductance Lp=30H @17Vrms/50hz /80mA dc

Leakage inductance : 5,2mH

airgap set for : 80-120mA (οn request)

Primary Dc resistance: 229 Ohm

Max Dc current :160mA

Maximum output power :25W

Frequency Response:

10Hz-38Khz -1dB (Rsource=1k5)

6,8Hz-44Khz -2dB

5,6Hz-90Khz-3dB

core material:High quality CRGO silicon steel M6 (19000Gauss), DIN EN 10107 ,made in Europe

core size : EI 96/50

lamination thickness /0.35mm

dimensions:119mmx100mmx81mm

weight :3Kgr per transformer

Winding method :layer wound with insulation insertion between every layer.

Winding Wire: Double coated Grade 2 enamelled copper wire made in Europe Wound in Precision Multi section winding, for reduced leakage inductance and high dielectric strength.

Mounting:End bells for Vertical placement

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