Vintage Audio Technology for the Modern Studio
UM17R Microphone

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Thiersch STW 7 Red

Blackspade Acoustics UM17R- Thiersch Capsule Edition

The Blackspade UM17 microphone was built to a price point- what is the best LDC tube microphone that we can build that can still street for under $1000?  Folks who tried the UM17 could not believe how good it was for that price.  But we also had producers and engineers asking the question, if the UM17 is that good, how much better could it be for $2000?  Well we at AMI and Blackspade have answered that question!  The UM17R takes the same basic platform of the UM17 to a new level of quality.  The K17 capsule is replaced by a Thiersch Elektroakustik STW 7 Red capsule, their Mylar diaphragm M7 style capsule that is the closest to the historic version available today.  We’ve replaced the power supply with one that is designed and made in the USA by AMI.  The mic cable is upgraded to one using Gotham GAC-7 cable with Switchcraft connectors.  And finally, the shock mount is custom made by Rycote in the UK for these microphones.  The result is the UM17R- a high quality microphone that stands up to the competition.

UM17R Owner's Manual

Product Features:
  • Thiersch Elektroakustik STW 7 Red capsule 
  • AMI designed and built PSU, made in the USA 
  • Custom Rycote Shock Mount
  • Gotham and Switchcraft 7-pin Connector Cable
  • Oliver Archut designed amplifier circuit
  • Our BV8LP transformer manufactured here in Gaylord, Kansas USA
  • NOS Telefunken/Sylvania EF732/5840 tubes
  • Flight Case
  • Assembled, burned in and tested in the US
  • 5-year limited warranty on all components except the tube which has a 6-month warranty, customer pays for shipping

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UM17R Prototype

Product Specs:
  • Type:  Condenser pressure gradient
  • Capsule:  Thiersch Elektroakustik STW 7 Red capsule 
  • Polar Patterns:  Remote 11-position switch from Omni to Figure 8
  • Frequency Range:  20Hz to 20,000Hz
  • Impedance:  200Ω
  • SPL:  128dB
  • Sensitivity:  14mV/Pa = -37dB (0dB= 1v/Pa) -10dB
  • Equivalent Noise:  17 dB, A-weighted
  • Non-linear Distortion:  1% THD @ 1000 Hz (132dB)
  • Mic Dimensions:  245mm long, 44mm diameter
  • Weight:  775g

This unit available soon.  List price:  $2199.