UM17B

Capsule: Thiersch Blue or Red M7
Transformer: Haufe T-7853 (BV08)
Tube: NOS EF-732 / 5840W
PSU: 6V filament, 120V B+
Manufacturing location: Switzerland
Availability: 2014-2017

Production status: Existing owners only
Service and Warranty: Fully supported
Spare parts: Available
Replaced by: UM4X / UM49B
Conversion options: UM4X / UM49B / RS4


UM17 / UM17R

Capsule: BSA K17 (UM17) / Thiersch Blue or Red M7 (UM17R)
Transformer: AMI BV8 LP
Tube: NOS EF-732 / 5840W
PSU: 6.3V filament, 120V B+
Manufacturing location: USA / Switzerland
Availability: 2010-2014

Production status: Discontinued
Service and Warranty: Fully supported
Spare parts: Available, except for transformer
Replaced by: UM17B
Conversion options: Thiersch capsule upgrade for UM17


UM25 / UM25C

Capsule: BSA CK25 (UM25) / Tim Campbell CT12 (UM25C)
Transformer: AMI T14
Tube: NOS Telefunken UBC-81
PSU: 14V filament, 120V B+
Manufacturing location: USA / Switzerland
Availability: 2012-2014

Production status: Discontinued
Service and Warranty: Fully supported
Spare parts: Available
Replaced by: M250
Conversion options: Campbell CT12 upgrade for UM25