Finally found a CTC40

[radiotvnut]

It didn't take long for me to realize that there were much cheaper tube sources out there. When I was getting them, I was a 12-13 year old kid and all I knew was that the RS catalog still advertised that tubes were available. Their prices were probably high because they really didn't want to be in the tube business and if they made the prices high enough, people would take their business elsewhere. Then, they could discontinue the sale of tubes because there wasn't enough interest.