The 145 is a shorter version of the 147, sharing the same amplifier but with 11 inches less height, making it easier to transport.

The 122 has a warmer tone due to its amplifier design, compared to the brighter tone of the 147, which shares components like the upper driver and motors.

The 142 Leslie uses a 122 amplifier but has slightly less bass response due to its shorter cabinet design.

The "145/7" label indicates versatility; the same hardware can be used for both 145 and 147 models.

A 147 amp can be modified with a 122's front end by adding a 12AU7A tube and other components, enhancing its versatility.

For clone keyboards, a pedal preamp is necessary, whereas tonewheel organs can integrate a custom kit for optimal performance with the Leslie cabinet.

In the US, a 122/142 in mint condition can fetch $1500+, while prices for beat-up units start around $500. UK prices vary widely.

A bent metal piece can cause pedal issues; easily fixed by bending or replacing with parts from Celedonia Organ Service.

Replacing the Leslie drum's cotton "shirt" can significantly reduce wind noise, enhancing audio clarity.

European Leslies from the post-Laurens Hammond era may have unique labeling quirks; identifying the cabinet size helps determine if it's a 145 or 147.

Plywood inner shelves in Leslies before 1970 provide stronger support and better resonance compared to later particle board versions.

Early 1970s Leslies with particle board shelves may sag unless the middle panel is left on, unlike sturdier plywood models.

Leslie cabinets from the mid to late 70s, especially European versions, may have chipboard construction rather than hardwood, affecting durability.

Owners recommend checking the metallic sticker/label for specific production details, which can sometimes be manually typed, indicating mid-70s manufacturing.