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 HMV vertical output transformer
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 Return to top of page · Post #: 1 · Written at 6:17:31 PM on 13 March 2018.
Ian Robertson's Gravatar
 Location: Belrose, NSW
 Member since 31 December 2015
 Member #: 1844
 Postcount: 2013

Anyone got one of these spare?

It's for an F series but a vertical output transformer for just about any HMV valve chassis bar a P1 can be made to work. It's got a split secondary to balance the vertical yoke windings around ground so as to cancel out the horizontal crosstalk which would otherwise be fed back through the current feedback transformer and degrade the excellent interlace performance of this chassis.

There are some HMV variants of this circuit that don't have the split winding but as I recall interlace performance suffers without it.


 
 Return to top of page · Post #: 2 · Written at 4:24:08 PM on 18 March 2018.
Ian Robertson's Gravatar
 Location: Belrose, NSW
 Member since 31 December 2015
 Member #: 1844
 Postcount: 2013

I have a suitable transformer, fitted and working, NOS for a Pye T20! Different but close enough.

Thanks Wayne!


 
 Return to top of page · Post #: 3 · Written at 4:26:27 PM on 18 March 2018.
Ian Robertson's Gravatar
 Location: Belrose, NSW
 Member since 31 December 2015
 Member #: 1844
 Postcount: 2013

And yes, as I suspected the interlace is not as good without the split secondary balancing the yoke around ground. But it's as good as an F1 and that'll do.


 
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