To be honest not sure where you found the specs on EE's site, these are the ones I see, not 700 ohm output impedance.. And Rogue does not list the output impedance at all so I would call them.. Good Luck
Specification
Tubes : 12AU7 x 2, 6X4 x 1
Frequency Response 10Hz~150kHz + - .5db
THD 0.015%
Output 2V
S/N ratio 93dB
Input impedance 100kOhms
Output impedance 1.5KOhms
Total gain 20dB
Channel balance 0.2dB
Channel separation 65dB
Power consumption 3W
Physical Dimension (WxLxH) 316 x 145 x 115mm
Weight 4kg
Specification
Tubes : 12AU7 x 2, 6X4 x 1
Frequency Response 10Hz~150kHz + - .5db
THD 0.015%
Output 2V
S/N ratio 93dB
Input impedance 100kOhms
Output impedance 1.5KOhms
Total gain 20dB
Channel balance 0.2dB
Channel separation 65dB
Power consumption 3W
Physical Dimension (WxLxH) 316 x 145 x 115mm
Weight 4kg