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Stancor C 2688 Heavy Duty Filter Choke Transformer NOS
Stancor C 2688 Heavy Duty Filter Choke Transformer NOS


NIB NOS Vintage Stancor Standard Transformer Corp P 8179 Power Transformer
NIB NOS Vintage Stancor Standard Transformer Corp P 8179 Power Transformer


Stancor Chicago standard power transformer PC8417 vacuum tube
Stancor Chicago standard power transformer PC8417 vacuum tube


NIB STANCOR PC8411 POWER TRANSFORMER
NIB STANCOR PC8411 POWER TRANSFORMER


Stancor C 2305 5H 100ma choke vintage transformer NOS
Stancor C 2305 5H 100ma choke vintage transformer NOS


FOUR STANCOR P 6428 FILIMENT TRANSFORMERS FOR YOUR TUBE AMPLIFIER PROJECT
FOUR STANCOR P 6428 FILIMENT TRANSFORMERS FOR YOUR TUBE AMPLIFIER PROJECT


Stancor power transformer for stereo tube preamplifier project
Stancor power transformer for stereo tube preamplifier project


Vintage STANCOR Standard Transformer Corp Part No A 4763 Transformer
Vintage STANCOR Standard Transformer Corp Part No A 4763 Transformer


Stancor P 6014 Tube Amp Power Transformer NOS NIB 750 5 63 Volts
Stancor P 6014 Tube Amp Power Transformer NOS NIB 750 5 63 Volts


2 of 2 Stancor PC 8411 Tube Amp Power Transformer NOS NIB 750 5 63 Volts
2 of 2 Stancor PC 8411 Tube Amp Power Transformer NOS NIB 750 5 63 Volts


Stancor Standard Transformer Corp Model P 5014 Filament Transformer
Stancor Standard Transformer Corp Model P 5014 Filament Transformer


Vintage Stancor Tube Power  Output Transformer 12ax7 5y3gt 6l6 12au7
Vintage Stancor Tube Power Output Transformer 12ax7 5y3gt 6l6 12au7


STANCOR PC8410 RACK OF THREE POWER TRANSFORMERS 720 CT 120MA FOR TUBE AMPLIFIER
STANCOR PC8410 RACK OF THREE POWER TRANSFORMERS 720 CT 120MA FOR TUBE AMPLIFIER


Stancor A 3850 8W Universal Output Transformer A3850
Stancor A 3850 8W Universal Output Transformer A3850


New In Box Vintage Stancor Model P 6466 Filament Transformer
New In Box Vintage Stancor Model P 6466 Filament Transformer


Vintage Transformers RCAStancorThermadorLot Of 4
Vintage Transformers RCAStancorThermadorLot Of 4


NIB NOS Stancor P 6461 Filament Transformer 10 volts ct  10 amps
NIB NOS Stancor P 6461 Filament Transformer 10 volts ct 10 amps


Stancor PC 8401 Power Transformer for Tube Amplifier
Stancor PC 8401 Power Transformer for Tube Amplifier


Stancor PC 8406 Tube Amp Power Transformer NOS NIB 650 5 63 Volts
Stancor PC 8406 Tube Amp Power Transformer NOS NIB 650 5 63 Volts


Stancor Standard Transformer Corp Model P 4076 Transformer P 4076 P4076
Stancor Standard Transformer Corp Model P 4076 Transformer P 4076 P4076


STANCOR 3311 25 watt tube output transformer PAIR with connector panels 10k ohm
STANCOR 3311 25 watt tube output transformer PAIR with connector panels 10k ohm


Stancor P 6377 Control Transformer 12 24V NIB
Stancor P 6377 Control Transformer 12 24V NIB


STANCOR P 6134 New Filament Transformer 117 Volts 60 Cycles
STANCOR P 6134 New Filament Transformer 117 Volts 60 Cycles


STANCOR POWER TRANSFORMER FOR AUDIO AMPLIFIER NOS
STANCOR POWER TRANSFORMER FOR AUDIO AMPLIFIER NOS


2 X STANCOR 845A2 TUBE AMP AUDIO OUTPUT TRANSFORMER
2 X STANCOR 845A2 TUBE AMP AUDIO OUTPUT TRANSFORMER


STANCOR P 8551 1A AMP 50 60HZ VOLTAGE 115V AC 24V AC POWER TRANSFORMER B359116
STANCOR P 8551 1A AMP 50 60HZ VOLTAGE 115V AC 24V AC POWER TRANSFORMER B359116


MATCHING PAIR OF AUDIO OUT PUT TRANSFORMERS
MATCHING PAIR OF AUDIO OUT PUT TRANSFORMERS


Vintage Airpax Radio Transformer Model LT 570
Vintage Airpax Radio Transformer Model LT 570


STANCOR STANDARD TRANSFORMER CORP P 6003 POWER TRANSFORMER
STANCOR STANDARD TRANSFORMER CORP P 6003 POWER TRANSFORMER


Stancor A 3311 25 Watt Vacuum Tube Audio Output Transformer EL84 6V6 PP
Stancor A 3311 25 Watt Vacuum Tube Audio Output Transformer EL84 6V6 PP


Stancor P 8618 Transformer 115 230V Input 24 48V Output
Stancor P 8618 Transformer 115 230V Input 24 48V Output


NIB Stancor A 3839 10K Opt Transformer for Tube Amplifier
NIB Stancor A 3839 10K Opt Transformer for Tube Amplifier


STANCOR P 8693 P8693 TRANSFORMER 115V 50 60HZ NEW
STANCOR P 8693 P8693 TRANSFORMER 115V 50 60HZ NEW


Stancor P 6134 Filament Transformer 1Phase 115V 50 60Hz NIB
Stancor P 6134 Filament Transformer 1Phase 115V 50 60Hz NIB


STANCOR P 8384 FILAMENT CONTROL TRANSFORMER 117V 136V NEW IN BOX
STANCOR P 8384 FILAMENT CONTROL TRANSFORMER 117V 136V NEW IN BOX


Stancor P 8150 Cathode Ray Tube Power Transformer NOS NIB 1550 25 volts
Stancor P 8150 Cathode Ray Tube Power Transformer NOS NIB 1550 25 volts


STANCOR TRANSFORMER P 8562 SEC 30VCT 20A PRI 115V 50 60HZ 3657A
STANCOR TRANSFORMER P 8562 SEC 30VCT 20A PRI 115V 50 60HZ 3657A


Stancor A 3852 18W Universal Tube Amp Output Transformer A3852
Stancor A 3852 18W Universal Tube Amp Output Transformer A3852


Vintage STANCOR Standard Transformer Corp Part No 55B029 Transformer
Vintage STANCOR Standard Transformer Corp Part No 55B029 Transformer


Stancor C 1411 Heavy Duty Filter Choke Transformer C 1411 C1411
Stancor C 1411 Heavy Duty Filter Choke Transformer C 1411 C1411


The main advantage of alternating currents over direct currents is that, the alternating currents can be easily transferable from low voltage to high or high voltage to low. Alternating voltages can be raised or lowered as per requirements in the different stages of electrical network as generation, transmission, distribution and utilization. This is possible with a static device called transformer. The transformer works on the principle of mutual induction. It transfers an electric energy from one circuit to other when there is no electrical connection between the two circuits. Thus we can define transformer as, the transformer is a static piece of apparatus by means of which an electrical power is transformed front one alternating current circuit to another with the desired change in voltage and current, without any change in the frequency.

Principle of Working

The principle of mutual induction states that when two coils are inductively coupled and if current in one coil is changed uniformly then an e.m.f. gets induced in the other coil. This e.m.f. can drive a current, when a closed path is provided to it. The transformer works on the same principle. In its elementary form, it consists of two inductive coils which are electrically separated but linked through a common magnetic circuit. The two coils have high mutual inductance. One of the two coils is connected to a source of alternating voltage. This coil in which electrical energy is fed with the help of source is called primary winding. The other the transformer works on the principle of mutual induction, for which current in one coil must change uniformly.

If D.C. supply is given, the current will not change due to constant supply and transformer will not work. Practically winding resistance is very small. For D.C., the inductive reactance is zero as D.C. has no frequency. Thus winding will draw very high current if D.C. supply is given to it. This may cause the burning of windings due to extra heat generated and may cause permanent damage to the transformer. There can be saturation of the core due to which transformer draws very large current from the supply when connected to d.c. Thus D.C. supply should not be connected to the transformers. There are two basic parts of a transformer
  1. Magnetic Core
  2. Winding or Coils.

 It is further divided into two parts. The vertical portion on which coils are wound is called limb while the top and bottom horizontal portion is called yoke of the core. Core is made up of laminations. Because of laminated type of construction, eddy current losses get minimized. Generally high grade silicon steel laminations (0.3 to 0.5 mm thick] are used. These laminations are insulated from each other by using insulation like varnish BIN laminations are varnished. Laminations are overlapped so that to avoid the air gap at the joints.

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