This documents has notes on Amp development and a on going list of amps in testing and or availability.

4 Chip CX card

https://hellocctv.en.ec21.com/Conexant_23881_ChipSet_DVR_Cards--3404368_3476920.html

Solder Paste & Flux (Genuine Antech)

https://amtechdirect.com/shop/amtech-nws-4200-tf-water-washable-anti-oxidation-tacky-solder-flux-orm1-30cc-syringe/

Note: Testing list

AD8367

https://www.aliexpress.com/item/32860308324.html - 12GBP (14GBP with VAT)

AD605

https://www.aliexpress.com/item/AD605-VGA-Dual-Channel-Voltage-module-Control-Adjustable-Gain-Amplifier-Module-Low-Noise-High-Precision-5V/33026097817.html 23GBP with VAT

The way the board is supplied, the 2 channels aren't configured the same.

Absolute gain range programmable −14 dB to +34 dB (FBK shorted to OUT) through 0 dB to 48 dB (FBK open)

One channel has FBK shorted to OUT (-14 to +34) gain range, and the other channel has FBK open (0 to 48db) range, controlled by R5 and R6.

OPA690 - Used by the DomesDayDuplicator

https://www.aliexpress.com/item/33008732817.html

OPA657 - In testing

https://www.aliexpress.com/item/32790115607.html