I am restoring a Tektronix 317 single trace scope from the early 60s. got it working good but need to replace some of the neon ne-2 bulbs used for current limiting. need to know the voltage and current rating of the bulbs used in these scopes. there r many different types and the manual only says ne-2 type but there r several types of ne-2 bulbs with different ratings. thanks kv8e doug