Well, my first attempt to remove and reinstall a tube on my first-ever tube monoblock amplifier, resulted in complete failure. See photo below. Any advice to help me solve this problem I've gotten myself into, hopefully avoiding having to take this amp in to a repair shop? PROBLEM: The plastic guide pin of the tube has broken off into the socket when I tried to reinstall it. I rocked the tube gently to get it out, and it came out easily enough, but trying to put it back in wasn't working, so I (probably stupidly, in retrospect) tried to rock it back in, and that's when the plastic broke off. This tube dates from circa early-1940s, as I best I've been able to find via online research. So then (maybe also stupidly?) I got a pair of needle-nose pliers and tried to carefully pull out the broken piece ... which basically broke another little piece of the guide pin off every time I tried, so now I have a plastic baggie of shards of brittle broken plastic. These are the tubes that came with the amps when I purchased them used. (This particular amp uses one tube per amplifier.) I was trying to troubleshoot why the left channel amp was quieter than the right channel amp. These tubes appear to be RCA VT-231, which according to VT- 231, Tube VT-231; Röhre VT- 231 ID16589, Double Triode is a6SN7GT type. The amps' manual recommends: 6SN7, 6SN7GT, 6SN7GTA, 6SN7GTB, 6SN7WGT, 6SN7WGTA, ECC32, 5692, 6180, CV1986, and CV1988.