V72a Input Pics Only

[CJ]

this thing was all tore up

first time i have done a take-a-part where every coil was open,

so no freq plot or inductance figures,

however, that does not mean we toss the corpse into the ditch without an autopsy,

please have respect for the dead as you view these morbid pics,

would you like it if you became landfill without your 15 seconds of fame and fortune?

ok then, lets roll!  ;D

 

[CJ]

this xfmr had provisions to tweak the gain and freq response, that is why all those parts were hanging of of it,

i believe that this is only the second xfmr i have hacked that uses 0.004 thick lams, in snap in form no less, amazing how they got the lams installed without bending them all up as they are as thin as heavy duty tin foil,

why .004 lams? better freq response, lower core loss, as flux penetrates deeper into the lam as it would for the same level on a .014 lam,

there were 92 ea. 1/4 inch tongue, 3/8 inch stack,

this lam has a built in gap, but no DC on the input so it must be for the perm as a one piece lam is more efficient, the grain is going the same way, unlike an EI lam where the "I" bar has the grain going 90 degrees to the "E" part,

this thing rattled around just like the choke-in-a-can that i took apart earlier, the foam was wasted, but the leads were still hooked up, the problem with the open coils was due to busted wires on the coil itself,

 

[CJ]

i actually feel sorry for the people who had to assemble this monster transformer, between the 92 tin foil snap in lams and the horrendous hookup, it has to be the worst nightmare on earth to build, i would rather try and solder transistors on a Pentium 3, no wonder none of the coils worked, it is a 6 chamber bobbin like the V76 input, only scaled down to torturous dimensions with #49 hair wire for both pri and sec, plus the individual holes thru the can, i mean cut me some slack Nestler!

 

[emrr]

These recent dissections are the first things I've seen that really start to look like the multi-section winds shown in RDH4.  Thanks for sharing.  This one really is a nightmare to look at.  No wonder they fail so frequently. 

 

[CJ]

yes, pretty fragile, i would not buy a V72a on ebay after taking apart the iron,

 

[desol]

So..i'm guessing this unit would be pretty impossible to recreate...