Projects › Bush TV12 Restoration: Replacing the Missing T4
Bush TV12 Restoration: Replacing the Missing T4
RestorationTelevisionRestoration405 lines
Last updated 30 September 2026
The Bush TV12 is the table-model companion of the TV22. In this set the lower line output transformer, T4, is missing completely, but the separate EHT overwind (T5) feeding the EY51 is still good.
So the plan is to wind a new T4 on an ETD49 ferrite core and keep T5, the EY51 and the rest of the line stage original. No tripler is needed. The design is preliminary until the TV12's own scanning coils have been measured.
At a glance
| Set | Bush TV12, 405 lines |
|---|---|
| Line output | PL38, PY31 efficiency diode |
| New T4 | ETD49 N87 ferrite, 550 t : 212 t, tapped secondary |
| EHT | Original T5 overwind and EY51, about 5.6 kV |
Documentation
The full design report, schematics and parts list will be published here once the project has been built, tested and filmed.