20-05-2024, 03:24 PM
Note that for the battery radios
LT on a PSU is less than number on a dry battery
1.5V -> 1.35V
7.5V -> 6.8V
9V -> 8.2V
Or adjust for 1.35V on the f+ of the lowest valve in a series chain. DAF91, DAF96, 1U5 etc.
For 2V valves use 2V
For HT you can use
22.5 -> 18
45V -> 36
67 -> 50
90 -> 80 (but 60, ie. 2 x LV PSUs should run!)
108 to 144V: use 90V.
Put a 20mA fuse in HT lead.
The batteries are higher voltage when fresh and endpoint is about 1V per cell with HT and about 1.1V per cell on LT.
Many signal mains valve (6.3V) will run at 12 to 30V HT. May need +1V gb for ECH81 (=ECH83). Valves such asT ECC82, EBF89 and many others. Only data sheets for Car Radio applications (10.8V to 14V supply) cover the operation. Max frequency for oscillators is reduced.
LT on a PSU is less than number on a dry battery
1.5V -> 1.35V
7.5V -> 6.8V
9V -> 8.2V
Or adjust for 1.35V on the f+ of the lowest valve in a series chain. DAF91, DAF96, 1U5 etc.
For 2V valves use 2V
For HT you can use
22.5 -> 18
45V -> 36
67 -> 50
90 -> 80 (but 60, ie. 2 x LV PSUs should run!)
108 to 144V: use 90V.
Put a 20mA fuse in HT lead.
The batteries are higher voltage when fresh and endpoint is about 1V per cell with HT and about 1.1V per cell on LT.
Many signal mains valve (6.3V) will run at 12 to 30V HT. May need +1V gb for ECH81 (=ECH83). Valves such asT ECC82, EBF89 and many others. Only data sheets for Car Radio applications (10.8V to 14V supply) cover the operation. Max frequency for oscillators is reduced.
