AMI Continental II audio questions
Posted: Sat Feb 21, 2015 3:16 am
I got the selection problems fixed by adjusting the bent selection arms ..... THANKS .
Now onto the audio amp and cartridge . The sound quality on this is very poor . Not totaly clean and has no bass . It does however sound pretty good with an ipod plugged into the input jack and has bass .
I pulled the amp and saw that it had been mostly recapped with yellow mylar caps and so on . I also saw where someone had replaced , added , moded ? 5 or 6 resistors right at the input jack . The cartridge in the tone arm is one of those fat GE magnetic type . I put a new needle on it and it helped somewhat clean the sound . I also tested the tubes and found all ok .
All 3 speakers were checked one at a time and are good . I checked the way they were hooked to the amp and thats ok .
I put the amp and volume control on the bench for inspection hooked to a test speaker box using an ipod as input . It sounded good but not totaly clean ... maybe because the input is to sensitive for that ?
I also tried a couple ceramic cartridges as a test and those sounded worse .
I have never seen this model of JB before and wondered if someone had moded the amp and used this GE cartridge and made a poor choice or did it wrong ? the work looks good / well done . I know this may be hard to diagnose here ?
I used my original thread as not to start another so go to the bottom ... Or mods delete the old info .
Thanks >
Now onto the audio amp and cartridge . The sound quality on this is very poor . Not totaly clean and has no bass . It does however sound pretty good with an ipod plugged into the input jack and has bass .
I pulled the amp and saw that it had been mostly recapped with yellow mylar caps and so on . I also saw where someone had replaced , added , moded ? 5 or 6 resistors right at the input jack . The cartridge in the tone arm is one of those fat GE magnetic type . I put a new needle on it and it helped somewhat clean the sound . I also tested the tubes and found all ok .
All 3 speakers were checked one at a time and are good . I checked the way they were hooked to the amp and thats ok .
I put the amp and volume control on the bench for inspection hooked to a test speaker box using an ipod as input . It sounded good but not totaly clean ... maybe because the input is to sensitive for that ?
I also tried a couple ceramic cartridges as a test and those sounded worse .
I have never seen this model of JB before and wondered if someone had moded the amp and used this GE cartridge and made a poor choice or did it wrong ? the work looks good / well done . I know this may be hard to diagnose here ?
I used my original thread as not to start another so go to the bottom ... Or mods delete the old info .
Thanks >