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Old 3rd Feb 2018, 6:48 am   #7
Argus25
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Join Date: Oct 2016
Location: Maroochydore, Queensland, Australia.
Posts: 2,679
Default Re: Bush TV22 restoration

Keith,

Most vertical blocking oscillators are in the range of 1:1.5 to 1:4 ratio. American sets favored a close to 1:4 ratio. These small transformers are readily available on US ebay too.

If you did use one with a higher ratio, it is necessary to reduce the value of the associated time constant capacitor.

In the case of the TV22, I think it is best to do what you are doing and attempt a rewind of the existing transformer stack. You can fashion a new bobbin for the stack fairly easily, that way when its finished it will look more original than any substitute transformer.

It is quite a lot of fun winding small transformers. I set up a small lathe with an electronic turns counter to wind such items. Picture attached.

Hugo.
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Last edited by Argus25; 3rd Feb 2018 at 6:53 am.
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