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Tube-I-zator Professional PCB

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just another update, fortunately i've got from a friend another shunt HV board made by Quang Hao (thanks Piero7), populated and connected the board in place it works perfectly, with a dummy load (6,8k 10W resistor), changed again the board with the Oliver's one and dummy load again Vout=Vin-2V:headbash:
for sure i'm doing something wrong, please Oliver and Salas check the pics posted before if everything is in the right place and orientation
 
a little update: just swapped the boards, same exact results, adjusting the trimmer result in the same behaviour (Vin=Vout-2v approx.)
any ideas??? i followed exactly the print on the pcb for components positioning.. i'll post a close up, perhaps i'm missing something...

edit: added pics

Not why you're having problems, but you'll need some heatsink paste on those transistors.
 
used already the "-" ;), i added thermal paste :p
i read:
IRF840
IRF9610
MJE350
K170GR

here's my order from mouser
Mouser No: 757-2SK170GRF
Mfr. #: 2SK170-GR(F)
Desc.: JFET N CHANNEL JFET Vds 10V Idss 3mA
4 € 0,883 € 3,53
4 Shipped 08/10/2010 24676674

Mouser No: 511-MJE350
Mfr. #: MJE350
Desc.: Bipolar Power PNP Medium Power
4 € 0,50 € 2,00
4 Shipped 08/10/2010 24676674

Mouser No: 844-IRF840PBF
Mfr. #: IRF840PBF
Desc.: MOSFET Power N-Chan 500V 8.0 Amp
4 € 2,38 € 9,52
4 Shipped 08/10/2010 24676674

Mouser No: 844-IRF9610PBF
Mfr. #: IRF9610PBF
Desc.: MOSFET Power P-Chan 200V 1.8 Amp
4 € 1,42 € 5,68
4 Shipped 08/10/2010 24676674
 
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