The duel ADA4857 based amplifyer is built to take the 12-13v power rail commonly found inside VCRs.

Deployment of amplifyers requires matching your impedence of your amplifyer, direct head amp taps are ideal for most VCRs in this case, then simply copy the resistance values in the path of your HiFi & Video RF signal paths.

Checklist:

• Multimeater to inspect VCRs voltages
• Soldering iron (Bevel/Chisel tips)
• Solder Paste & or Flux + 60/40 Solder
• 22AGW Cable
• 0805 1% Resistor Parts Book

Optional:

• 12v battery (not critical but can allow you to verify if your deck has high noise from its power supply.
• A Digital Store Ossiliscopoe (DHO804 or more affordable equivlent messuremnt tools equiped scope)

Adjust Resistors

• Basic Adjustment Guide

Then adjust the input resistance vlaues

R13 & R14 - Path A

R23 & R14 - Path B

And adjust the gain level

Path A

Rf = R14

Rin = R13

Path B

Rf = R24

Rin = R23