Hi all,
Inherited an old but near pristine bench power supply. It has a total of five pilot lamps for the various outputs. The lamps don't work, even with fresh bulbs. Actually the bulbs in the unit test fine and light up when removed and voltage applied. So.. the T2-1/2 sockets must be to blame (yes, voltage does reach the sockets). After much head scratching (i mean can there be a simpler circuit?!) i discovered there is no connectivity between the top of the spring-loaded pin (to which the bottom of the bulb pushes) and its other end at the outside of the socket! Only two possibilities: (1) The sockets became defective after use, or (2) there was no connectivity from Day 1.
I'm inclined to disbelieve the former since there is no evidence of a short or anything else that might cause a failure (the sockets look like new) and the original (?) bulbs still light. It seems these sockets may never have worked. I'll order some new sockets. In the meantime i just wondered if anyone else has encountered such a thing?
Inherited an old but near pristine bench power supply. It has a total of five pilot lamps for the various outputs. The lamps don't work, even with fresh bulbs. Actually the bulbs in the unit test fine and light up when removed and voltage applied. So.. the T2-1/2 sockets must be to blame (yes, voltage does reach the sockets). After much head scratching (i mean can there be a simpler circuit?!) i discovered there is no connectivity between the top of the spring-loaded pin (to which the bottom of the bulb pushes) and its other end at the outside of the socket! Only two possibilities: (1) The sockets became defective after use, or (2) there was no connectivity from Day 1.
I'm inclined to disbelieve the former since there is no evidence of a short or anything else that might cause a failure (the sockets look like new) and the original (?) bulbs still light. It seems these sockets may never have worked. I'll order some new sockets. In the meantime i just wondered if anyone else has encountered such a thing?
