tubes 444
I bought a TD 125 New back then there days. It was pretty much near the top at that time. I still have it BUT!! with many tweets.
1.Replaced to whole platter with solid pc Alum. Turned down on a lathe.
2.New Wt 23#.. then 20 bored 1/2" Dia holes bottom up each filed with silicone every so many degrees. The then had it spin balance. Within .002 0z.
3. Replaced the shaft with 4140 Steel (Harden) Inserted ceramic
machined & polished cup to 45 micron finish for the bearing to seat.
5. Order a complete ball bearing housing.
Aero space grade tolerance. Robbed one bearing.
6. I tube of SUPER MOLY lube used on very high speed friction control.
7. Had the drive Mtr rewind with. 99% OCF copper. Replaced its shaft bearings with high quality ones. had the motor armature balanced.
8. Replaced the speed controller with digital. Will now hold 33.3 RPM
+/- within 800ths of exact RPM. Same as 33.333336.
9.Added 10# of modeling clay to the inside of the wood base.
10. Added gel filled table feet to the wood frame.
11. 4 Oil filed suspension supporting 125 table. Shocks @ ea corner
TEST TIME.
With scope and sound generator radiator DIRECT connected to wood.
Then 15Hz> 20Hz> 50Hhz> 100 Hz random sweeps .
Range now -45 to- 65DB.
Results rumble inaudible. PERIOD!!
Why all the effort & expense. Dead silent on soft passages, Airy strings
cymbals float out the speakers for the 1st time. Female vocals very throaty.
Again WHY?? Why let some engineer have all the FUN at my expense.