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Just what I was thinking- the bolts look like they should hold down the second half of the core. As Jim said the core is cracked too, so not much inductance. No wonder the 2n3055 is getting hot.Hi joshAU,
Have you removed the top of the transformer core before taking the pictures or was there no top part of the core fitted originally ? I have never seen an EHT transformer with an open magnetic path.
Les.
That all sounds good JoshThought I'd test the transformer first...
Just to be sure I removed the cable you had me test earlier that bypassed C75 and C81.
I still haven't put those components back in yet, as I don't think they'd affect these measurements.
OK.
I measured the resistance from the lower side of R116 to the lower side of R115, as per the schematic, which should be correct to measure the resistance of the 31 turn coil, and it shows no resistance.
I measured the resistance from the right hand side of R117 to the the lower side of R114, to measure the 15 turn coil, and it also shows no resistance.
I measured the resistance from the top of the secondary coil - at the +50 point, to the left hand side of D17 and it measures 641 Ohms.
hmm...
I measured the resistance from the right of R119 to the left of R120, and I get 18 Ohms.
hmm again.
Hopefully the method I used was correct.
Feel free to let me know if that is not the case.
Josh
I just realised then JimB that it was some type of ferrite.
So it shouldn't be part of the problem then I guess.
I will take your recomendation re gluing it though, once I've worked out the problem.
Thanks again, I appreciate it.
Josh
Yes I noticed that and assumed that the transformer had been dismantled intentionally by joshAU.Have you removed the top of the transformer core before taking the pictures or was there no top part of the core fitted originally ? I have never seen an EHT transformer with an open magnetic path.
good morning spec.
the EHT board with the transformer was originally enclosed in a metal casing, which, now you mention it, I just had a look inside and saw another ferrite looking device attached to the top of it.