Dating hiwatt amplifiers

Any serial number that begins with one or more letters was made in the 90s or later, and is not included in this list.

Please note also that the speaker cabinet serial numbers used a different progression.

All products are designed and proudly hand-crafted in the USA to your specifications by musicians and electrical engineers.

MERREN AUDIO provides custom wound transformers for both output and power applications including chokes. Moving coil, Interstage and pre-amp output transformers. Switching Power Supply design and manufacture We offer "0ne-of-a-Kind" pre-amplifiers and power amplifiers starting from the design stage to the finished product based on you requirements.

Wide bandwidth output transformers for Single Ended and Push-Pull vacuum tube applications.


Two main heads powered four 4×12” WEM speaker cabinets while the third head was a spare.Controls for normal volume, brilliance volume, bass, middle, treble, presence and master.These are my pages dedicated to the wonderful classic valve guitar amps known as HIWATTs - the product of the design genius of the late Dave Reeves.David would also scale down his rig for TV-appearances in 1970-’71 using only one Hiwatt head and a WEM cabinet.


Hiwatt DR103 All Purpose 100W heads with Mullard 4x EL34 power tubes and 4x ECC83 pre-amp tubes.HIWATT was a life-long labor of love for Reeves, and he ran the company until his unfortunate accidental death in 1981.


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