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power supply question who can help me ?

My mono power amps a 2a3 driver 1:2 interstage coupled to a 300b has the following power supply:
I want to now if this is a good stable supply or that there are improvements
its a CLCLC supply
for the for the 2a3/ 5r4 2uf 10H 47uF 10H 47uF opt.
the chokes are 96 Ohm
for the 300b the same supply also with his own 5r4 rectifier
the 2a3 has a ct 290v winding on the transformer /anode 288v dc running at 57mA /14 Watt
and the 300b a ct 450v /anode 471v dc running at 93 mA /34 Watt


The amps are totally quiet
but sometimes if the amps a few hours on i here a sort of motor boating a very low freq but only for 4 or 5 seconds
and then it is away for sometimes one hour or 10 minutes its not loud but i can feel it
also.
i can't dowload the psu designer on my Apple
and if i never work with it
can someone tell me if the supply is stable ?
i checked the tubes already it are not the tubes.

i must say today i listening a few hours to the amps and the strange noise was not there
hope some one can help me with this question.






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Topic - power supply question who can help me ? - horny 15:24:52 03/10/15 (10)

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