13-08-2018, 09:22 PM
Hi David.
I use the Vishay (or similar) yellow axials rated at 630 volts. They can easily be hidden in the old wax cap tubes if so desired.
The snag can be that even caps of 30 years will degrade, some are better than others to be fair.
Resistors too can change value and in the main they increase with age. Some values seem worse than others oddly, EG 27k 47k 100k 220k 470k and above. In the main valve circuitry is very forgiving and even wildly out of spec values wont make a noticeable difference. Frame stages and the grid leak resistor on the line output valve are ones that need to be within tolerance.
I use the Vishay (or similar) yellow axials rated at 630 volts. They can easily be hidden in the old wax cap tubes if so desired.
The snag can be that even caps of 30 years will degrade, some are better than others to be fair.
Resistors too can change value and in the main they increase with age. Some values seem worse than others oddly, EG 27k 47k 100k 220k 470k and above. In the main valve circuitry is very forgiving and even wildly out of spec values wont make a noticeable difference. Frame stages and the grid leak resistor on the line output valve are ones that need to be within tolerance.
