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 
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* 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.