I have a Pioneer SD-1000 Audio Scope with a dead CRT. It is the M6525B1B CRT according to the manual. I have seen on another post that you can use the CRT from a Leader LBO-310 or 310A in place of the M6525B1B. I have these Leader scopes and one has the 75AKB1 CRT (which happens to also be used in the Pioneer SD-1100 Audio Scope) and the other scope has a C3S49P1 CRT. It is hard to find any information on these CRT's much less any substitute information. Does anyone know if I can use the 75AKB1 or the C3S49P1 CRT's in place of the M6525B1B? Thanks in advance for any help or advise. These are nice little units and I would really like to bring it back to life.