Bassdude V1 cathode resistor question

G

Gritdog

New member
I was doing some analysis of the Bassdude/bassman schematic for an upcoming build. This article (https://www.ampbooks.com/mobile/classic-circuits/fender-bassman-5F6-A/) says that the 820ohm V1 cathode resistor is shared across two triodes, which means that if you’re building a one channel amp you would double it to 1.64k (unless you joined the two cathode pins, which I saw is possible in this thread: https://www.tdpri.com/threads/bassman-micro-v1-cathode-resistor.1115674/).

The bassdude keeps the original 820ohm value - does this mean the cathode pins are joined or should I increase this value to ~1.5ish to more closely reflect the amp?

Thanks!
 
Bassdude is based on the 5D6 Bassman, which does indeed have a shared cathode connection across two triodes, but since each triode acts as an input stage for the respective channel you're only using one at a time, which made me think the 820Ω cathode resistor for V1A was fine for Bassdude. Realistically though, I wouldn't expect you to notice any difference at all if you were to try a 1.5kΩ resistor there either. Cathode resistor value becomes much less important (assuming you stay within a degree of magnitude) when the cathode is bypassed like it is here.
 
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