I have a Roadblasters with a VERY dim pciture and a tube with A48AAR25X, 6.3, 23
I can only find this old Paperboy tube with M48AAW00X, 6.3, 23
A friend pointed me to here :
http://www.bkprecision.com/downloads/pdf/CRT_Setup_Chart.pdf where i got the heater and CR/CA values.
Sorry but I am...