Just as a precaution try re-torquing the main drivers on the speakers, it’s probably not that as it’s unlikely the’ve both gone at the same time but if the bolts are a bit loose it can cause buzzing dependant on programme and probably a small variation between the amps will excite things a bit differently.
Thanks Yeti.
Have done.
And is the Qute to 250 interconnect cable the same interconnect as had been 252 to Snaxo. If so, silly question - any possibility you crossed over the inputs of the 2nd 250? Because if yes and yes, then maybe the interconnect cable.
Different cable. Qute output is 2x RCA but to 3 pin DIN input on the 250.
The active set up uses a DIN to DIN from SNAXO to 250. It uses one for each amp and I tried them both ways around.
Keep trying folks. I will try the chrome 250 tomorrow. Fingers crossed.
Bruce
New type of tinnitus, swapping from ear to ear?
To begin with I just thought Lana Del Rey was too close to the mike…
I imagine you have tried just using the Qute with your speakers to exclude a cable/speaker issue just in case the soldering on your cables is failing?
Hi Bruce,
Sounds typical of the caps in the power supplies of the 250s beginning to oscillate, I will stick my neck out & say that it occuring on both amps (purchased seperately) simultaneously is pure coincidence.
It happens gradually over a long period.
Have the 250s serviced & I think you will be delighted with the results.
Regards
Neil.
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Well my wife was fed up with me chuntering so I have fiddled some more and…hallelujah.
My old chrome bumper 250 from the office is distortion free in the system passive and on the main driver active. So one needs a recap, and it probably makes sense to do both. The oldest is 1990 and I bought it a fair few years ago, the other 1995. I will ask Naim if ever serviced…bit embarrassing really.
Thanks to all for suggestions. Apols to Mrs W who wanted to do something else with her evening not stepping over cables and boxEs.
Bruce
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Final fiddle; one is worse than the other but both have a bit of a drop in similar ways. No wonder I was confused.
Naim confirm one not been serviced since made in 1990, the other last done 2005.
Reasonable to give them some tlc I think.
Wow Bruce can’t complain about the 1990 one , done really well, and the other has 14 years on it.
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Bruce, well done for the patient process of deduction. Yes, it sounds very much like your 250s have been on borrowed time for a while. The good news though is that they will come back from a service performing as good as, and perhaps even better than when new.
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30 years and needs a service. Naim should be ashamed 
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