HT Transformers for Valve Amplifiers.

Links

[U-Clamp Style] [Frame Style] [Drop-Through Style] [Shroud with Feet Style] [HT transformers]
U-Clamp Frame Drop-Through Shroud with Feet HT Transformers

  • Page Updated 08 May 2017.
  • Additional versions of some HT transformers with different shape.

  • A range of HT (High Tension)Transformers optimised for Valve Equipment.
  • Circuit options include:
    • Bridge Rectifier.
    • Full Wave Rectifier.
    • Heater Secondaries.
    • Vibrator Input.

  • Models suitable for Solid State or Valve Rectifiers.
  • Some models are available in 'Magnetics kits' with better prices for a set of magnetics.
  • Low flux density for low distortion and low external magnetic fields.
  • Professional quality materials.
  • Varnish Impregnated for Low Acoustic noise.
  • Compliant with current safety requirements.
  • Special versions made to order.
  • Heater windings for rectified (DC) heater supplies can be added, can be arranged to provide sufficient volts for a linear regulator if required.
  • Several styles available for most designs.
  • Transformers identified as Double Insulated may be used without Earth connections to reduce Ground Hum Loops.



Order Codes and Datasheet Links in First Secondary Voltage order

Range Codes:

  • N = Normal (Standard range for general use).
  • S = Simple (Reduced primary complexity).
Status Order Code Range Description Clamp Frame Drop Through Metal Shroud with Feet
VTH13120 range
(Previously VTH118)
N Mains 10-0-200-220-240 50/60Hz
Double Insulated
Full Wave 65-0-65 VRMS 50mA DC
Rectify(Silicon) and smooth for 90 V DC HT
Filament 1.5-0-1.5 VRMS 300mA
Rectify(Silicon) & Smooth For 1.4 Volt Valves
VTH13121 range
(Previously VTH119)
N Mains 10-0-200-220-240VRMS 50/60Hz
Double Insulated
Full Wave rectifier 65-0-65 VRMS 50mA DC
Rectify(Silicon) and smooth for 90 V DC HT
Filament 5.8-0-5.8 VRMS 80mA
Rectify(Silicon) & Smooth For Series of four 1.4 Volt Valves
VTH14691 range
(Previously VTH121)
S Mains 235VRMS 50/60Hz
Double Insulated
Full Wave rectifier 125-0-125 VRMS 20mA DC
Heater 6.3V Heater 1.2A (not centre tapped as data sheet says)
Suitable for Phono Pre-amps etc
VTH15670 range N K Mains 10-0-200-220-240 50/60Hz
Double Insulated
Full Wave rectifier 190-0-190 VRMS 40mA DC
Heater 6.3 VRMS 1 Amp
Suitable for the Firefly Amplifier
VTH12965 range
(Previously VTH105)
To be replaced by VTH18721 range
N Mains 10-0-200-220-240 50/60Hz
Double Insulated
Full Wave rectifier 190-0-190 VRMS 65mA DC
Heater 6.3 VRMS 2 Amp
New VTH18721 range
(alternative shape to VTH12965 range)
N Mains 10-0-200-220-240 50/60Hz
Double Insulated
Full Wave rectifier 190-0-190 VRMS 65mA DC
Heater 6.3 VRMS 2 Amp
VTH12888 range
(Previously VTH126)
N Mains 10-0-200-220-240 50/60Hz
Double Insulated
AC Output 240 VRMS 180mA RMS
Optimised for Isolating AC/DC amplifiers and radios
U clamp not available for this size
Updated with primary tappings VTH15864 range
equivalent to obsolete Maplin XP27E
S Mains 10-0-200-220-240V 50/60Hz
Double Insulated
HT Output 240 VRMS 100mA
Heater 6.3 VRMS 1.5 Amp
VTH14670 range
(Previously VTH133)
N Mains 10-0-200-220-240 50/60Hz
Double Insulated
Full Wave 250-0-250 VRMS 50mA DC
or Half Wave 500 VRMS 30mA
Filament 6.3 centre-tap 1.5 A RMS
For Low power Amps. Preamps or Experimental Use
VTH15078 range
(Previously VTH128)
N K Mains 10-0-200-220-240 50/60Hz
Double Insulated
Full Wave rectifier 250-0-250 VRMS 80mA DC
Heater 6.3 Volts C-Tap 2 Amp
Heater 6.3 Volts 1 Amp
Suitable for Mullard 3 Valve (2x ECL82 1x EZ80) stereo amplifier
Note that this is not suitable for the Mullard 3:3 Mono amplifier (using EL84)
U clamp not available for this size
VTH15610 range S Mains 235VRMS 50/60Hz
Double Insulated
Bridge rectifier 255 VRMS 300mA DC
Heater 6.3 Volts 5 Amp
U clamp not available for this size
VTH15794 range N Mains 10-0-200-220-240VRMS 50/60Hz
Double Insulated
Bridge rectifier 255 VRMS 300mA DC
Heater 6.3 Volts 5 Amp
U clamp not available for this size
VTH12616 range
(Previously VTH101)
N Mains 10-0-200-220-240 50/60Hz
Double Insulated
Bridge rectifier 265 VRMS 180mA DC
U clamp not available for this size
VTH12983 range
(Previously VTH102)
N Mains 10-0-200-220-240 50/60Hz
Double Insulated
Full Wave rectifier 265-0-265 VRMS 180mA DC
U clamp not available for this size
VTH12611 range
(Previously VTH103)
N Mains 10-0-200-220-240 50/60Hz
Double Insulated
Full Wave rectifier 265-0-265 VRMS 180mA DC
Heater 6.3 VRMS C-Tap 4 Amp
U clamp not available for this size
VTH12219 range
(Previously VTH104)
N Mains 10-0-200-220-240 50/60Hz
Double Insulated
Full Wave rectifier 265-0-265 VRMS 180mA DC
Heater 6.3 VRMS C-Tap 4 Amp
Rectifier Heater 0-4-5-6.3 VRMS 2 Amp
U clamp not available for this size
VTH15651 range N Mains 10-0-200-220-240 50/60Hz
Double Insulated
Full Wave rectifier 265-0-265 VRMS 180mA DC
Heater 6.3 VRMS C-Tap 4 Amp
Rectifier Heater 5 VRMS 3 Amp
U clamp not available for this size
VTH15774 range N Mains 10-0-200-220-240 50/60Hz
Double Insulated
Full Wave rectifier 300-0-300 VRMS 80mA DC
Heater 5 Volts 3 Amp for 5U4
Heater 6.3 Volts C-Tap 1.6 Amp for two EL84
Heater 6.3 Volts C-Tap 0.6 Amp for ECC81
Suitable for RH84SE amplifier
U clamp not available for this size
VTH12562 range S Mains 240 VRMS 50/60Hz
Double Insulated
Full Wave rectifier 300-0-300 VRMS 80mA DC
Heater 6.3 Volts C-Tap 1 Amp
Heater 6.3 Volts 1 Amp
Suitable for Mullard 3-3 mono amplifier
Soon.
Alternative shape
VTH18741 range S Mains 240 VRMS 50/60Hz
Double Insulated
Full Wave rectifier 300-0-300 VRMS 80mA DC
Heater 6.3 Volts C-Tap 1 Amp
Heater 6.3 Volts 1 Amp
Suitable for Mullard 3-3 mono amplifier
VTH12926 range
(Previously VTH112)
To be replaced by VTH18720 range
N Mains 10-0-200-220-240 50/60Hz
Double Insulated
Full Wave rectifier 300-0-300 VRMS 80mA DC
Heater 6.3 Volts C-Tap 1 Amp
Heater 6.3 Volts 1 Amp
Suitable for Mullard 3-3 mono amplifier
New. Alternative shape VTH18720 range N Mains 10-0-200-220-240 50/60Hz
Double Insulated
Full Wave rectifier 300-0-300 VRMS 80mA DC
Heater 6.3 Volts C-Tap 1 Amp
Heater 6.3 Volts 1 Amp
Suitable for Mullard 3-3 mono amplifier
VTH12480 range
(Previously VTH107)
N Mains 10-0-200-220-240 50/60Hz
Full Wave rectifier 300-0-300 VRMS 125mA DC
Heater 6.3 Volts Centre tapped 3.1 Amp
Heater 6.3 Volts 1 Amp
Suitable for Mullard 5-10 mono amplifier
U clamp not available for this size
VTH12924 range
(Previously VTH111)
N Mains 10-0-200-220-240 50/60Hz
Double Insulated
Full Wave 300-0-300 VRMS 160mA DC
Heater 6.3 Volts Centre tapped 2 Amp
Heater 6.3 Volts 1 Amp
Suitable for Mullard 3-3 stereo amplifier
U clamp not available for this size
VTH12865 range
(Previously VTH106)
N Mains 10-0-200-220-240 50/60Hz
Double Insulated
Bridge rectifier 300 VRMS 180mA DC
U clamp not available for this size
VTH13332 range
(Previously VTH115)
N Mains 10-0-200-220-240 50/60Hz
Full Wave rectifier 300-0-300 VRMS 250mA DC
Heater 6.3 Volts C-Tap 6.2 Amp
Heater 0-5 Volts 2.3 Amps (GZ32) or 0-6.3 Volts 2 Amps (2 x EZ81)
Suitable for Mullard 5-10 stereo amplifier
U clamp not available for this size
VTH14756 range
(Previously VTH108)
N Mains 10-0-200-220-240 50/60Hz
Full Wave rectifier 350-0-350 VRMS 150mA DC
U clamp not available for this size
VTH13144 range
(Previously VTH116)
N Mains 10-0-200-220-240 50/60Hz
Full Wave rectifier 350-0-350 VRMS 250mA DC
Heater 6.3 VRMS C-Tap 7 Amp
U clamp not available for this size
VTH12587 range
(Previously VTH117)
N Mains 10-0-200-220-240 50/60Hz
Full Wave rectifier 350-0-350 VRMS 250mA DC
Heater 6.3 VRMS C-Tap 7 Amp
Rectifier Heater 0-4-5-6.3 VRMS 2 Amp
U clamp not available for this size
VTH12922 range
(Previously VTH110)
N Mains 10-0-200-220-240 50/60Hz
Full Wave rectifier 410-0-410 VRMS 200mA DC
Heater 6.3 Volts Centre tapped 3 Amp
Heater 6.3 Volts Centre tapped 2 Amp
Rectifier heater 5 Volts 2 Amps
Suitable for Mullard 5-20 mono amplifier
U clamp not available for this size
VTH14685 range
(Previously VTH122)
N K Mains 10-0-200-220-240 50/60Hz
Full Wave rectifier 410-260-0-260-410 VRMS 200mA DC
Heater 6.3 Volts Centre tapped 6 Amp
Heater 6.3 Volts Centre tapped 2 Amp
Rectifier heater 5 Volts 2 Amps
Suitable for Mullard 5-20 mono amplifier
With extra 260 volt taps for auxiliary rectifier (for pre-amp etc)
U clamp not available for this size
VTH13310 range
(Previously VTH114)
See also VTH14757
N Mains 10-0-200-220-240 50/60Hz
Full Wave rectifier 410-0-410 VRMS 400mA DC
Heater 6.3 Volts Centre tapped 6 Amp
Heater 6.3 Volts Centre tapped 2 Amp
Rectifier heater 5 Volts 5 Amps (2xGZ34 parallel)
Suitable for Mullard 5-20 stereo amplifier
U clamp not available for this size
VTH14757 range
(Previously VTH134)
N K Mains 10-0-200-220-240 50/60Hz
Full Wave rectifier 410-260-0-260-410 VRMS 400mA DC
Heater 6.3 Volts Centre tapped 6 Amp
Heater 6.3 Volts Centre tapped 2 Amp
Rectifier heater 5 Volts 2 Amps
Suitable for Mullard 5-20 stereo amplifier
With extra 260 volt taps for auxiliary rectifier (for pre-amp etc)
U clamp not available for this size

© 2017 - Variable Voltage Technology Ltd. Document Number DCW12704.
Issue Number: 24 - Dated: 08May2017 - FRACAS: X50480 - Release: Y11249.