There are 4 and 6 way mains adapters with a filter built in for about £40, while the MK socket is £60+vat. Are the former any good ?
What would other people do ?.
Andrew
A couple of weeks ago, there was a sound from the corner of the room where the mains sockets are. It was your classic spark sound, like if you shorted out a changed capacitor. Apart from turning off the Amazon smart plug internally, nothing much else happened, and everything has worked since, and no, no local storms either. I'm baffled as it was really loud and no music or TV was making a sound. I had to turn the switch on again via alexa, but no problems. It only powers a sub woofer in any case. Of cours the noise could have come from one of the trailing sockets, but no sign of loose wires or burned bits. It only operates low current devices like the TV and some chargers. Now I recall that one of the socket extenders had an overvoltage vdr in it, and I guess it may have been that, but all looks uncooked well feels uncooked. Brian
Might have been a cap in a mains filter suppressor giving out the magic smoke. The would be little (or no) operational difference observable.
ISTR my Fein multimaster did similar a while back when I turned it on!
not waste money on pointless products
Try interposing the same filter block between the mains and the tuner to see if that makes any difference. It would have to be very peculiar electrical noise to interfere with a modern tuners stored data.
Does it also zap the AM settings?
Try and figure out why the tuner is misbehaving rather than buying a random expensive mains filter on a wing and a prayer.
They are mostly used to prevent clicks and pops coming down the line when your arc welder strikes, the fridge or oil burner starts from cold. Inductive loads (or dead shorts) can put a glitch on the mains.
Do you unplug it between uses? Possible that whatever stores the presets no longer works unless it's plugged in (I've a Teac tuner that's broken in this way).
Wild speculation: Before such setting were stored in devices such a EEPROM they may have been stored in a device that had battery backup and the battery is failing.
+1
There's a picture. The main board is single sided, so the copper tracks are on the bottom, and jumper wires on the top layer, form the missing second layer of routing. A break-away PCB.
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AVs are full of subassemblies, for reasons best known only to the manufacturer. Sometimes, this could come down to sub-contracting out the boards.
I don't see a coin cell in the picture.
If there are actual settings memories, they could be done with NOR flash instead of NAND flash. If a flash wore out, the controls would appear "jammed", and keep returning to the wrong choice each time.
The interesting ICs are on the bottom of the main board.
Paul
A quick check of the schematic shows no obvious batteries or capacitors used for back-up.
The schematic can be downloaded from
The service manual including circuit diagrams is comprehensive.
There must be a flash device of some sort on there.
There used to be "digital pots", which stored a number internally for the desired level, but that would not be particularly suited to running a tuner. The tuner might be using a synthesizer for frequency selections.
It could be one of the chips has a serial EEPROM off to the side.
Paul
The suns solar cycle is reaching its maximum at the moment. We too have had unexplained data corruption in our TV presets and my mobile phone screwed a couple of apps. I wouldn't rule that out - which also be causing mains interference/overvoltages.
Although it is getting near solar maximum the sun isn't particularly active and we haven't seen a decent aurora yet in North Yorkshire. I think you can discount solar influence for the moment.
You would have to be in Earth orbit for it to affect electronics!
Apart from at a particular time of day when near the equinoxes the sun will be in just the right place to blind satellite TV for a few tens of minutes either side of when the sun and satellite are both in the beam.
Haven't tried. There is nothing on AM that I want to listen to.
Something also deletes all the stored settings in a plug in SMiths 7-day timer unless that is plugged into a mains filter (used to do timed ON/OFF for something else).
Power on while pressing MEMORY does a full rescan and then it is fine for anything from 10 minutes to much much longer before it starts cutting out intermittently, just like a dodgy aerial connection.
I have checked the *socket* on the end of the new 'CT100' cable going directly up to the loft-mounted aerial and it is fine. The FM connector on the back of the Denon is a plug.
Dads old Roberts Gemini RD20 with the telescopic aerial replaced by an F-connect and coax flylead plugged into the left aerial works fine.
No. But I don't leave it on standby. Sometimes the FM settings are there at power on, sometimes not.
Yes, that's what I saw when I took the lid off.
I didn't see anything that looked like a battery either.
That does sound very much like a failing battery or failing supercapacitor depending on age. Lots of things these days do not like being switched off at the wall if they provide a standby mode.
Try leaving it in standby and see if the settings stay OK.
I turned it on about midday today and all the stations were there so I left it on Classic FM. About an hour later I went downstairs to make a cup of tea and it had gone silent.
I wonder if there is a dry joint somewhere that starts to make the sound go on/off as the unit warms up ?. The actual FM module is a plugin card with the demodulator physically mounted on it. Too fiddly for me to deal with, lots of tiny surface mount components.
Bring back a nice worly rotary dial connected to a capacitor? with some waxed string.
yesterday (Sunday) I switched it on at the mains and FM was perfect for about 45 minutes and then it started intermittently cutting out (and the AUTO and other indicators blanked on/off) and then went silent completely (AUTO etc off), so I switched it off at the mains as I usually do.
Today I turned it back on and all stations are working perfectly again (for now). I'll time how long it takes before the cutting out starts).
This seems like a dry joint or broken pcb track or some other connection that is subject to thermal movement. Unfortunately I am not able to identify a failure of this type, there are too many surface mount components on the Radio tuner plugin card for that.
sm parts are much less prone to bad connections than anything else. So you could run on the assumption it's not an sm part & probably succeed.
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