@z32kerber
Because you stated "I’ve always loved the sound", the following list starts with the highest priority:
1) Get your Cary Audio CAD 300B working again. Finding a sound you love is the holy grail of audiophiles. As amplifiers age, the sound quality gradually diminishes as the parts wear out. You may not have noticed as this is a very gradual process. Refurbishing/upgrading parts (tubes, capacitors, resistors) should at least bring the sonics back to the original level.
2) Get the designer's (Dennis Had?) opinion on what to do along with suggested other amps
3) Contact Cary Audio to get opinion on what to do along with suggested other amps
If you change your amps and/or speakers you will get a different sound, likely an upgrade but no guarantees that you'll like the change.
Because you stated "I’ve always loved the sound", the following list starts with the highest priority:
1) Get your Cary Audio CAD 300B working again. Finding a sound you love is the holy grail of audiophiles. As amplifiers age, the sound quality gradually diminishes as the parts wear out. You may not have noticed as this is a very gradual process. Refurbishing/upgrading parts (tubes, capacitors, resistors) should at least bring the sonics back to the original level.
2) Get the designer's (Dennis Had?) opinion on what to do along with suggested other amps
3) Contact Cary Audio to get opinion on what to do along with suggested other amps
If you change your amps and/or speakers you will get a different sound, likely an upgrade but no guarantees that you'll like the change.