Please find reviews below:

BOULDER 3110 Preamplifier and 2108 Phono Stage review in ” The Absolute Sound ” Magazine, August 2020
http://www.theabsolutesound.com/articles/boulder-3010-preamplifier-and-2108-phono-preamplifier/
BOULDER 2108 Specifications
Three pairs balanced,
converts to unbalanced
Two pairs balanced,
converts to unbalanced
INPUT IMPEDANCE (MAXIMUM)
MC: 1000 ohms
MM: 47k ohms
Resistive and capacitive loading adjustable on individual Personality Cards
RIAA,
FFRR (London/Decca),
EMI,
Columbia
MC: 70 or 60 dB
MM: 50 or 40 dB
160 μV A-weighted, 275 μV flat,
20 Hz to 20 kHz
FREQUENCY RESPONSE, 20 HZ TO 20 KHZ
CROSSTALK, L TO R OR R TO L
-100 dB or better,
20 Hz to 20 kHz
PHONO PREAMPLIFIER WEIGHT
37 lbs. (16.8 kg)
Shipping: 51 lbs. (23.2 kg)
48 lbs. (21.8 kg)
Shipping: 69.5 lbs. (31.6 kg)