- Joined
- Mar 11, 2014
- Messages
- 280
I just finished a unit with two V72 (left) and one V76 (right). They sound great and are very quiet. I've compared them to original units and I think the sound quality is just as good. I actually like my V76 more since I've removed the filters and therefore get a more open sound. Before I get to the question I would like to brag about the complex switch I built for the V72s. It allows me to switch between the circuits of V77, V72, V72S, V72S EMI and V78 (I know they have different transformers etc). Besides the gain flexibility the sound changes when I switch. I like them all. The clearest difference is V77. Without the positive feedback the sound is a lot cleaner and the top sounds more open.
Now to my question. The voltages of the V76 match the schematics very close except for the plate where it's about 40-50V higher. The only conclusion I can make is that the Sowter chokes are not perfect clones of the original (or the values on the schematics are wrong). Would you leave it as it is or add a resistor in series before the choke? In other words. Whats the most important? Correct plate voltage and bias or avoid the increased distorsion and altered load of the tube with the added resistor?
Now to my question. The voltages of the V76 match the schematics very close except for the plate where it's about 40-50V higher. The only conclusion I can make is that the Sowter chokes are not perfect clones of the original (or the values on the schematics are wrong). Would you leave it as it is or add a resistor in series before the choke? In other words. Whats the most important? Correct plate voltage and bias or avoid the increased distorsion and altered load of the tube with the added resistor?
