They're 12v lamps. Here's the link to the ones I buy from Radio Shack:
12V/25mA Miniature Lamps - RadioShack.com
You can use 12v LED lamps. They sell pretty cheap in bulk on Ebay from China sellers... usually about $5 per 10.
Did you ever get a mic working with the Bengal?
SP
I know. There's two bulbs... red and clear... behind the meter. Radio Shack sells the 12v red lamp as well. Here is the link:
12V Snap-In Red Lamp Assembly (2-Pack) - RadioShack.com
These old radios are about as good as they get from the 70s. The Bengal uses a Uniden chassis and is basically the early first generation version of the Uniden Washington. Doesn't get much better than that