using triplers in old color sets

[wa2ise]

Originally Posted by DaveWM

if its an autoformer its all one long winding.

Yes, but the wire will be thicker near ground. usually the HV winding starts at the point where the horiz output tube cap connection connects.

[Zenith6S321]

Originally Posted by old_tv_nut

It is this improvement that you will lose if you wind a new secondary without redoing it by trial and error to get the tuning right.

Assuming you could remove a bad HV winding from an otherwise good flyback and had some other source providing the HV, would any additional components be needed (to replace the HV winding tuning) to get the flyback to perform its normal functions while the other HV source provided the focus and anode HV? That would open the possibility to re-use otherwise bad flybacks buy providing another HV source.

[Alastair E]

I recently replaced a overwind with a tripler in a 1963 Bush TV125 monochrome set.

The principle is much the same for a color set.

I found that I had low width and low EHT. I did not need to make a small overwind but sourced the tripler input from the anode of the Line-Output Valve, The boost-diode being too low in voltage.

Adding capacitance to the scan circuit to 'replace' that lost in the missing overwind cured both issues.
--It also reduced the apparent heating effect of the primary of the LOPT.

I used 470pF additional capacitance in the scan circuit.

[old_coot88]

Interesting. What points did you connect the 470pf to?

[Alastair E]

I added the cap across the coils that drive the scan-coils on the LOPT.