I am curious about adding trim pots to my RK1. Has anyone done this mod? It seems that I have read how Mesa sets up their bias cold. Could I be able to obtain a much warmer tone with the bias properly set? Any feedback would be appreciated.
trim pot mod
- Thread starter hazbin
- Start date
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Boogiebabies
Well-known member
You just have to replace the bias resistors for the 6L6's with a trim pot.
The only issues I would have is that the progressive linkage using two 6L6's may cause the bias to go higher than expected as the current draw is cut from 4 or 6 tubes to two. It may be nominal and biased for this occurence. The EL34 bias circuit on the RK already has a trim pot for bias adjustment. It's a small blue trimmer with a gold screw. It's set pretty hot already. The smartest advice I can offer is to find someone who **** well knows what they are doing. The schematic and circuit board are a beast to figure out. The circuit board is scary and there are leads and ribbon cables all over, so find someone who has the hands of a surgeon to avoid burnt cables and endless problem solving in the future.
The only issues I would have is that the progressive linkage using two 6L6's may cause the bias to go higher than expected as the current draw is cut from 4 or 6 tubes to two. It may be nominal and biased for this occurence. The EL34 bias circuit on the RK already has a trim pot for bias adjustment. It's a small blue trimmer with a gold screw. It's set pretty hot already. The smartest advice I can offer is to find someone who **** well knows what they are doing. The schematic and circuit board are a beast to figure out. The circuit board is scary and there are leads and ribbon cables all over, so find someone who has the hands of a surgeon to avoid burnt cables and endless problem solving in the future.
