I had this problem back in 2000 and I found a carver repair center called Everett Audio Repair ,email: ear@foxinternet.net or tel#425-339-8404. I ordered 2 bulbs and installed them myself as I am a technician .You may also try www.sunfire.com.
I hope that this has been helpful.
Sincerely,
JGD
I hope that this has been helpful.
Sincerely,
JGD