restoring a selmer clavioline

I have found a schematic for the old organ I'm restoring:
http://www.vintagehofner.co.uk/britamps/selmer/schematic/clav2.html

For the moment I'm only looking at the power part.
The 5y3gt has been replaced by a VT244 and somebody allready swapped one or both 16uF electrolytics.

I read no DC from chassis to pin8 of the rectifier.
There's about 180Vdc from the PT-centertap to pin8.
There's also about 180Vdc over the choke.  The choke measures about 500ohm, and it gets hot.

I had never seen this choke arrangement ?
I thought that most of the time the PT-centertap did go to ground ?

That arrangement will generate a negative voltage across the choke, used for whatever is on the octal socket? Sounds like you have a dead short on your h.t. line.

thanks! you are right.
Embarassing I hadn't noticed that, I hope I didn't burn anything.
One of the 16uF elco's had developped a short.
B+ goes to up 320Vdc now.

The octal socket on the schematic in the right bottom corner goes to the keyboard section.

I replaced all the electrolytics in the power amp section,
but the cap that goes to centertap and choke smokes !!
I checked and doublechecked the polarity of this cap, it is with its - side to the center tap.
The replacement cap was 22uF/350V.
The rectifier tube is replaced with a VT244.

Can someone give some guidance how I can safely see where it goes wrong ?
I do have a variac.

Thanks.

Cap is bad. Replace it.

I would really expect 450V caps, not 350V.

I tried that,
and smoked a second one just as quick.
Is it possible that the 350V caps smokes this quick because of overvoltage.
I would expect them to go slowly.

To try out bigger voltage caps I need to buy some.

You mentioned that someone had replaced a cap before.  Compare what you have to the schematic very carefully.  There might be something changed. 
Replacement caps should not be smoking if the circuit is proper.
Mike 

Indeed sodderboy, there were parts missing.
I think I have it right now.
It passes audio and I have these voltages.

unloaded;
350-0-350VAC sec
B+ = 476VDC
Vheaters = 6,76VAC

loaded;
315-0-315VAC
B+ = 235VDC

6v6(1)
    2. 6,3VAC
    3. 200Vdc
    4. 233Vdc
    5. 42Vdc
    6. 226Vdc
    8. 48Vdc
6v6(2)
    2. 6,3Vac
    3. 200Vdc
    4. 233Vdc
    5. 42Vdc
    6. 226 Vdc
    8. 43Vdc
6J5gt
    3. 80Vdc
    6. 222Vdc
    7. 6,2Vac
    8. 4Vdc

The B+ voltage is lower than I expected.