Mitsubishi TT LT-20 Tracking

[BensonIsDead]

First post and a two-day old member here. I recently inherited an LT-20 and because you provided such great info to By-Tor, I thought I'd give this a shot before tearing it apart to replace the bulbs. I have the exact same issue with my LT-20 not tracking. I performed the above adjustments according to the manual and here's some images. The first image you can see the tonearm is floating and parallel to the TT.
https://dmrobinson.smugmug.com/LT-20/i-5KcCD5m


and here you can see when it's playing tonearm is not resting on the armtube:
https://dmrobinson.smugmug.com/LT-20/i-ZLQzX5B

It seems to want to track. Here's a video playing, I placed a razor blade next to the tracking to see the movement better, but after six minutes it just stops tracking.

Based on these post here it's a bulb, but wanted to get an opinion before I move to the next step.

 

[BensonIsDead]

Also, to add additional information, if I put a 7" 45 and hit play it cues of perfectly, plays perfectly and the tonearm will return to the holder and stop spinning.

 

[BensonIsDead]

also to add... took the bottom panel off...
There are three lights for the tracking arm. We will call bulb one closest to the front of the TT, bulb two will be middle, bulb three closest to the rear of the TT.
Bulb one and two are on for tracking for 12":
https://dmrobinson.smugmug.com/LT-20/i-Ssj83Dk

Bulb one and three are on for tracking for 7":
https://dmrobinson.smugmug.com/LT-20/i-2SCnpPK

 

[Markoneswift]

Haven't you got another thread going, for this exact same issue? Might get confusing if you get replies in both.....

 

[BensonIsDead]

Here's the LT-20 playing a 7"... eventually, tracking lights at the end of the video. Adjusting cue start can be done by the side, so i'm not too worried about that... but could help.

 

[BensonIsDead]

Haven't you got another thread going, for this exact same issue? Might get confusing if you get replies in both.....

I do, but on an older less view thread. I'm new, learning but really just want to get into the community. I've read everything I could find online, read all the manuals... just looking for help.

 

[Markoneswift]

I do, but on an older less view thread. I'm new, learning but really just want to get into the community. I've read everything I could find online, read all the manuals... just looking for help.

You've certainly picked a complex and tricky machine to learn on - good luck with it

 

[T68]

Sorry, cannot help you with this one. Really cool turntable! But these kind of issues makes me feel like I´ve taken the right decision to stick with TT:s where the only electronic component is a capacitor on the on/off switch to prevent speaker-pops. I leave the ones requiring a degree in electronic engineering to fix to the pros.
But hopefully members that have experience fixing these will chime in soon.
Good luck!

 

[Pio1980]

Lamps and lube generally put these things back in service. Do a general web search on the problem, and see the giant AK thread on them.
https://audiokarma.org/forums/index.php?threads/mitsubishi-lt-30-restoration.298682/