I am currently making a component shopping list for the 5/10. For the high-stability resistors (R4+5), I found a metal film type for these at 1%, am I going down the right road or is there something better? As for the remainder, apart from the volt droppers (R7,14+22), would it be OK to use the same as (to keep the supplier down to a minimum), as for the wattage, would Ibe doing any harm by increasing the 0.25 w to 0.5w and so on. My only thought is the cathode load resistors ( R18+19)
Upping power capability might also increase maximum allowed voltage and that is probably a good move.
As for precision modern resistora are more then enough, remember that tubes have wide limits on parameters.
As for precision modern resistora are more then enough, remember that tubes have wide limits on parameters.
That crossed my mind; the build instructions give the 'a', 'k' and grid voltages, so if there are any anomalies, could I change the volt drop resistors to suit the specified parameters?
If you read the fine print, you are unlikely to find any resistor under 1W that will have a voltage rating over 250V.
Thanks, Old Hector, I do agree which is why I wanted to up the wattage, handling such small components also. I have seen you are on here often, do you have any thoughts regarding the volt drop for any adjustments that may need to be made at various test points
It is a fairly exact science, based on the quiescent cathode currents at the designen ooeratung points. The load resistor helps plot the load line, to predict the operating point.
Do you have a schematic? If it is a standard build there must be an annotated schematic out there.
Do you have a schematic? If it is a standard build there must be an annotated schematic out there.