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====== Pre-amplifiers specs and characterizations ======
Upload here the specs, modifications and characterizations of the pre-amps.

* (RHK) STM 100, labelled "Vortex"
  Modified 1 stage RHK pre-amp. Gain: 10^10 V/A, bandwidth=1 kHz
  Specs: downlaod:

* (RHK) STM 100, labelled "Oxides" (ex-"Indy")
  1 stage RHK pre-amp. Gain: 10^8 V/A, (bandwith=250 kHz, Min. tunneling current= 25 pA)
  Specs: download:
  
* (RHK) IVP 200:
  1st stage: 10^8 V/A, bandwidth=50kHz, Min. tunneling current=5 pA, Noise @ 1.5 kHz bandwd=1.5 pA
  2nd stage (x10): 10^9 V/A
  2nd stage (x100): 10^10 V/A
  Specs: download: pre-amp-ivp200.pdf, low_current_imaging_with_rhks_stm_preamplifiers.pdf 
  {{stm:pre-amp-ivp200.pdf}}\\
  {{stm:low_current_imaging_with_rhks_stm_preamplifiers.pdf}}\\

* Homemade IV converters:
  Insert here documentation and specs of home made amplifiers. Mention also the name of the ELD technician who built it and the date.