Classic choke for all Marshall® JTM Amplifiers. Often declared as a 5H Choke, which is absolutely wrong, it has only 3H meausered with a DC bias of 100mA. Enclosed you can find pictures of the datas taken with a WAYNE KERR precision induction analyzer comparing mine with an original choke. 

The classical output transformer at all. Manufactured by the British transformer factory Drake Ltd, this type was fitted into the Marshall® JMP 50 Watt series.

As with all other replicas, an original output transformers was available, which was of course carried out meticulously and carefully.

The classic JTM 45 Output-Transformer. Manufactured by the British transformer factory Drake Ltd, this Output Transformer was used in Marshall® JTM 45 Amplififiers with KT66 power valves.

As with all other replicas, an original output transformer was available, which of course was carried out meticulously and carefully. The rebuild became an additional 4 Ohm tap, the 100 Volt winding is burried and not attached by a white cable like the original.

Exact layer winding, the use of original materials and carefully stacking of the transformer laminations are only part of the basic prerequisites for an exact copy of the original. The output transformer has the original dimensions and can be easily replaced. Delivery is as shown with the silver powder coated bell ends for vertical mounting.

This output transformer is designed for DIY Projects of the Marshall ® 36 Watt amplifier. However, it is suitable for other Valve Amplifiers using four EL84 tubes in the power amplifier section without any problems.

To get the typical British vintage sound, this Output Transformer is wound on a paper bobbin including paper layer insulations. It is supplied as shown in the pictures, including the original British style shrouds, which are powder coated in silver.

Marshall® 36 Watt Mains Transformer

IGMT-M36R

This power transformer can be used both for construction of a 36 Watt Marshall ® amplifier, or for any other project with 4 EL84 power valves. In addition to the 2 + 290 volts, it still has a tap for 2 + 275 volts. Also both voltages can be rectified by a rectifier valve or a full wave rectifier using diodes. 

This mains transformer fits into the usual offered Marshall®36 Watt chassis without any mechanical works.

This product meets the required RoHS directive and the safety requirements of EN60742.

Technical Data

Power: 170 VA

Primary: 0/230/240 Volt

Electrostatic shield

Secondary: 290/275/0/275/290 Volt(AC) @ 0.20A (DC)

0/5 Volt @ 3A ( AC)

3,15/0/3,15 Volt 6A (AC)

Marshall® 45 or 50 Watt Mains Transformer

IGMT-M45/50R

This power transformer can be used both for construction of a 45 Watt or 50 Watt Marshall ® amplifier. In addition to the 2 + 350 volts, it still has a tap for 2 + 325 volts. Also both voltages can be rectified by a rectifier valve or a full wave rectifier using diodes. 

This mains transformer fits into the usual offered Marshall®45 or 50 Watt chassis without any mechanical works.

This product meets the required RoHS directive and the safety requirements of EN60742.

Technical Data

Power: 170 VA

Primary: 0/230/240 Volt

Electrostatic shield

Secondary: 350/325/0/325/350 Volt(AC) @ 0.15A (DC)

0/5 Volt @ 3A ( AC)

3,15/0/3,15 Volt 5A (AC)

Marshall® 18 Watt Mains Transformer

IGPT-M18TMB

This mains transformer was especially designed for the Marshall® 18 Watt Valve Amplifier. Based on the original "RadioSpares Hygrade Mains Trans." the high voltage winding was reduced on multiple demand to 290 volts. In all other points, like wire gauge, turns ratio, stacking height and outer dimensions, this transformer corresponds to the original. The primary voltages were adapted to today's needs.

This mains transformer fits in the most currently available 18 watts chasses without mechanical processing. It corresponds to the demanded RoHs guidelines as well as the safety regulations of the European EN60742.

Technical Data

Secondary rating: 103 VA

Primary: 0/230/240 Volts

Electrostatic Screen

Secondary: 290/0/290 Volts(AC) @ 0.12A (DC)

0/5/6,3 Volts @ 2/1A ( AC)

3,15/0/3,15 Volts 3A (AC)

Marshall® 18 Watt Output Transformer

IGOT-M18R

Marshall® 18 Watt Output Transformers

IGOT-RSEL84

This item is the original reproduction of the RadioSpares® EL84 output transformer, This type was found in the first 18 Watt Marshall® Amplifiers. As the original it is build up with the 29ga "Silcor 2" lamination. Of course this version is wound on  paper tube bobbins too, the wire ends are brought out in isolation  sleeves.

Due to safety reason,s I have done this version without the original turet board on top of the transformer  ,

Measurements on the Output Transformer

Two of the ten measurements for quality assurance before shipment of the goods. For all the measurements the induction Analyzer 3245 from Wayne Kerr® is used