Dansette Bermuda - UK Vintage Radio Repair and Restoration Discussion Forum

regentone001 · 24th May 2018, 7:32 pm

Hi
just wondering if anyone can work out what caused this fault.
After checking out the amp and finding nothing needed replacing, I changed the cartridge and the player worked extremely well. Only other thing to do was change the mains lead as the original was quite short. there is an isolated amp in this player so I replaced the 3 core lead with new 3 core, checked it was ok before replacing the deck in the case all was fine. Dropped the deck back in screwed in the plinth switched on and loud hum. The hum varied with the vol. It was quite easy to fix once the changer was taken out again.But I was surprised that the fault didn't cause something else to happen

Steve

Stylo N M · 24th May 2018, 10:09 pm

Three core cable, did you invertedly disturb the earth connection to the deck, and thus remove the earth from the negative side of the pickup?

If this was the case, it is unlikely that it would cause any other issues than just a hum.

Paul

Edward Huggins · 25th May 2018, 7:21 am

If the Bermuda was already fitted with a 3 core cable, then there was really no need to change it. The only difference is in the cable colours. Assuming you have a Bermuda Mark 1 (most likely if it needed a cartridge change) in these models stray hum pick up is caused by those long trailing leads that go to the rear of the cabinet (and back again) and in most cases are never, ever connected to! Hopefully, when changing the cartridge (was it a BSR TC8H originally?) you were able to find the correct type. If you have fitted a medium-output cartridge (the wrong type) then you will need to increase the volume to get an acceptable level of sound - which will also increase a risk of more hum.

Station X · 25th May 2018, 11:07 am

One thread hijacking off topic post moved to a new thread here:-

https://www.vintage-radio.net/forum/...d.php?t=146852

leslie5555 · 25th May 2018, 2:16 pm

Steve, you say "it was quite easy to fix once the changer was taken out again" but what did you have to do to fix it?

regentone001 · 26th May 2018, 7:56 am

Well it is the version with an ECL82 valve so an M cartridge was ok. What had happened though was that the end of the white, 90volt tap, wire which did not connect to anything was touching the pu tag strip connection to the amp hence the hum. Why it didn't trip the mains trip I don't know but if the changer hadn't been earthed the whole thing would have been live. Easily fixed by insulating the end on the white wire. The fact that it was just the very end of the snipped wire was a fluke there was no stripped wire showing

val33vo · 26th May 2018, 10:17 am

Was the 90v tap on the motor ? In the distant mists of time I seem to remember the motor being used as an auto transformer for the amp

'LIVEWIRE?' · 26th May 2018, 11:20 am

That 90v tap was, as you say, making use of the motor as an autotransformer. It was used to supply the heaters of typical 'one-valve' record players, which almost always used UL84 & UY85, the heater voltage of the two in series being 90v @ 0.1Amp.

Edward Huggins · 26th May 2018, 1:27 pm

It now sounds as if this player was the Mark 2 version of the Bermuda made from 1966 onwards using an UCL82 and UY85. But hold on, earlier there was a reference to a 3 core mains lead. Also no Bermuda ever used an ECL82 valve.....Why is it such a struggle to find out just what player we are talking about here!

24th May 2018, 7:32 pm	#1
regentone001 Heptode Join Date: Sep 2014 Location: Coventry, West Midlands, UK. Posts: 519	Dansette Bermuda Hi just wondering if anyone can work out what caused this fault. After checking out the amp and finding nothing needed replacing, I changed the cartridge and the player worked extremely well. Only other thing to do was change the mains lead as the original was quite short. there is an isolated amp in this player so I replaced the 3 core lead with new 3 core, checked it was ok before replacing the deck in the case all was fine. Dropped the deck back in screwed in the plinth switched on and loud hum. The hum varied with the vol. It was quite easy to fix once the changer was taken out again.But I was surprised that the fault didn't cause something else to happen Steve

24th May 2018, 10:09 pm	#2
Stylo N M Heptode Join Date: Jul 2012 Location: Derby DE1, Derbyshire, UK. Posts: 626	Re: Dansette Bermuda Three core cable, did you invertedly disturb the earth connection to the deck, and thus remove the earth from the negative side of the pickup? If this was the case, it is unlikely that it would cause any other issues than just a hum. Paul

25th May 2018, 7:21 am	#3
Edward Huggins Dekatron Join Date: Sep 2015 Location: Southwold, Suffolk, UK. Posts: 8,327	Re: Dansette Bermuda If the Bermuda was already fitted with a 3 core cable, then there was really no need to change it. The only difference is in the cable colours. Assuming you have a Bermuda Mark 1 (most likely if it needed a cartridge change) in these models stray hum pick up is caused by those long trailing leads that go to the rear of the cabinet (and back again) and in most cases are never, ever connected to! Hopefully, when changing the cartridge (was it a BSR TC8H originally?) you were able to find the correct type. If you have fitted a medium-output cartridge (the wrong type) then you will need to increase the volume to get an acceptable level of sound - which will also increase a risk of more hum. __________________ Edward.

25th May 2018, 11:07 am	#4
Station X Moderator Join Date: Jan 2003 Location: Ipswich, Suffolk, IP4, UK. Posts: 21,288	Re: Dansette Bermuda One thread hijacking off topic post moved to a new thread here:- https://www.vintage-radio.net/forum/...d.php?t=146852 __________________ Graham. Forum Moderator Reach for your meter before you reach for your soldering iron.

25th May 2018, 2:16 pm	#5
leslie5555 Heptode Join Date: May 2015 Location: Reading, Berkshire, UK. Posts: 692	Re: Dansette Bermuda Steve, you say "it was quite easy to fix once the changer was taken out again" but what did you have to do to fix it?

26th May 2018, 7:56 am	#6
regentone001 Heptode Join Date: Sep 2014 Location: Coventry, West Midlands, UK. Posts: 519	Re: Dansette Bermuda Well it is the version with an ECL82 valve so an M cartridge was ok. What had happened though was that the end of the white, 90volt tap, wire which did not connect to anything was touching the pu tag strip connection to the amp hence the hum. Why it didn't trip the mains trip I don't know but if the changer hadn't been earthed the whole thing would have been live. Easily fixed by insulating the end on the white wire. The fact that it was just the very end of the snipped wire was a fluke there was no stripped wire showing

26th May 2018, 10:17 am	#7
val33vo Retired Dormant Member Join Date: Apr 2008 Location: Banffshire, Scotland, UK. Posts: 191	Re: Dansette Bermuda Was the 90v tap on the motor ? In the distant mists of time I seem to remember the motor being used as an auto transformer for the amp

26th May 2018, 11:20 am	#8
'LIVEWIRE?' Rest in Peace Join Date: Mar 2006 Location: N.W. Oxfordshire(Chipping Norton) Posts: 7,306	Re: Dansette Bermuda That 90v tap was, as you say, making use of the motor as an autotransformer. It was used to supply the heaters of typical 'one-valve' record players, which almost always used UL84 & UY85, the heater voltage of the two in series being 90v @ 0.1Amp.

26th May 2018, 1:27 pm	#9
Edward Huggins Dekatron Join Date: Sep 2015 Location: Southwold, Suffolk, UK. Posts: 8,327	Re: Dansette Bermuda It now sounds as if this player was the Mark 2 version of the Bermuda made from 1966 onwards using an UCL82 and UY85. But hold on, earlier there was a reference to a 3 core mains lead. Also no Bermuda ever used an ECL82 valve.....Why is it such a struggle to find out just what player we are talking about here! __________________ Edward.