Made to our specification by ValvePower UK (valvepower.co.uk), this is intended as a drop-in replacement for the power transformers fitted to JMI-era Vox AC30/4 and AC30/6 amplifiers. Equally good for new-build projects.
Because these transformers use original-specification laminations, the bolt holes correspond to original 1960s dimensions without requiring any modifications or new holes to be drilled. You should also be able to re-use your existing shroud and bolts if you would like to do so, although use of the supplied insulated washers is advised.
Note that JMI used two different arrangements of the primary wires, depending on the mains transformer and chassis manufacturer. In some amps the primary leads emerge from a grommeted hole in the base of the shroud onto the upper side of the chassis where they are routed to the voltage selector. In other amps, the primary leads are routed to the underside of the transformer to emerge on the lower side of the chassis and are then routed through a grommeted opening to the upper side of the chassis and onwards to the voltage selector. Both of these arrangements are supported with these transformers.
The original part numbers that these will replace include OH114 (Haddon and Albion units), 66313 (Parmeko) and J/82 (certain Woden versions). This transformer uses original-specification laminations, SRBP bobbins and the original colour coding for the leads. Winding construction closely follows the Haddon pattern.
Note: the lowest-voltage primary tap is rated at 122 V on our units, making them ideal for replacing or upgrading the transformers in US-based amps. The 122 V tap replaces the 115 V tap found on all original JMI AC30 power transformers which can cause overheating in AC30s because US wall voltages are typically around 120–122 V. This change has no effect on the other (160, 205, 225 and 245 V taps.
Made to our specification by ValvePower UK (valvepower.co.uk), this is intended as a drop-in replacement for the power transformers fitted to JMI-era Vox AC30/4 and AC30/6 amplifiers. Equally good for new-build projects.
Because these transformers use original-specification laminations, the bolt holes correspond to original 1960s dimensions without requiring any modifications or new holes to be drilled. You should also be able to re-use your existing shroud and bolts if you would like to do so, although use of the supplied insulated washers is advised.
Note that JMI used two different arrangements of the primary wires, depending on the mains transformer and chassis manufacturer. In some amps the primary leads emerge from a grommeted hole in the base of the shroud onto the upper side of the chassis where they are routed to the voltage selector. In other amps, the primary leads are routed to the underside of the transformer to emerge on the lower side of the chassis and are then routed through a grommeted opening to the upper side of the chassis and onwards to the voltage selector. Both of these arrangements are supported with these transformers.
The original part numbers that these will replace include OH114 (Haddon and Albion units), 66313 (Parmeko) and J/82 (certain Woden versions). This transformer uses original-specification laminations, SRBP bobbins and the original colour coding for the leads. Winding construction closely follows the Haddon pattern.
Note: the lowest-voltage primary tap is rated at 122 V on our units, making them ideal for replacing or upgrading the transformers in US-based amps. The 122 V tap replaces the 115 V tap found on all original JMI AC30 power transformers which can cause overheating in AC30s because US wall voltages are typically around 120–122 V. This change has no effect on the other (160, 205, 225 and 245 V taps.
