Problem HR Diemen 7370 LOPT

[cools]

A while back I picked up a bunch of different Hantarex Polo chassis - sold as working but not shown as such. Usual caveats, they were a fair price even if they possibly would need repair by an expert rather than me.

What I'm curious about is that two of them (a Polo 25 and a Polo 28) had their LOPT replaced with a HR 7370. There's some signs of life - the 25 degausses (while throwing a spark at one end of the fuse) and the 28 makes a slow clicking sound, but neither have the grey wire that comes out of the smaller/second transformer connected to anything.

Line Output Transformer / Flyback: HR7370 (HR 7370) - 12420178 ELDOR MONITOR LINE OUTPUT TRANSFORMER (LOPT)/ FLYBACK... - UK (GBP)

hr 7370, 12420178 eldor monitor line output transformer (lopt)/ flyback 28029390

www.donberg.co.uk

Should the wire be attached anywhere? Are these even a suitable replacement? The pinout doesn't seem to match a HR7381 and the chassis themselves don't appear to have any modifications, so I'm wondering if someone in the past fitted them while praying they'd work.

 

[M K L]

HR7370 is for the Polo 25"/28" 25KHz, not for the more common 15KHz version. The 25KHz version (which can do 15KHz as well) has vertical modules for poly caps behind the flyback and uses a tube with a low inductance horizontal coil (same as a 31KHz tube). The external block contains the HV smoothing cap (across anode and ground) that you can see in the diagram in the link you posted (sometimes it's built in the flyback body). If you're not sure post pics.

 

[cools]

Here they are. I don't see anything different to my working ones around the flyback area.

 

[M K L]

That's a 15KHz Polo so 7370 should not be used on that.