Help VTL Deluxe 120 807 mono mono power amplifie

Dear Friends,

I purchased a pair of VTL Deluxe 120 mono mono amplifier using 807 power tubes about a year ago. However, I can not find any documentation. Could any one please help me on the following two questions:

1. How to set the bias? where can I measure the voltage, Where I can adjust the voltage, and what is the voltage to set to?
2. What are the input tubes?


there are screwdriver reachable pots one next to each pair of tubes. there are also test lead reachable holes next to each pair of tubes. the two smaller tubes are input (taller tube) and split duo-triode(smaller one) that do not need any bias. deluxe monos have solid state recrifier that is only visible on its PCB. contact luke manley or bea from vtl to get precise voltage setting. it's been very long time since i've owned those.