Decca Deccalian Mk4 Smoothing Cap - UK Vintage Radio Repair and Restoration Discussion Forum

skamanuk · 25th Dec 2017, 12:01 am

I need to replace the smoothing cap on my Decca Deccalian Mk4 Extension Speaker. It's a 32uf 32uf (Voltage numbers rubbed). This cap has 4 tags and the only modern examples I can Find are 32uf 32uf 500v but only 3 tags?. Can these be used to replace...Thanks

julie_m · 25th Dec 2017, 12:13 am

You can use a 3-terminal can capacitor as a replacement if and only if the two negatives are joined together (they ought to be joined together anyway, but may not if a voltage-doubling rectifier is used). Otherwise you probably will need two separate capacitors. 500V will be fine for a record player.

skamanuk · 25th Dec 2017, 12:24 am

It appears the Rectifier Valve is EZ80 The others being ECC83 X2 & EL84.

AC/HL · 25th Dec 2017, 1:38 am

Both negatives are connected to the chassis, this is a conventional circuit: http://www.service-data.com/section....deccalian-mk-4, so a standard 3 terminal can will be OK. The highest voltage quoted on the circuit diagram is 300V, so anything higher should be OK.

25th Dec 2017, 12:01 am	#1
skamanuk Retired Dormant Member Join Date: Apr 2013 Location: London, UK. Posts: 245	Decca Deccalian Mk4 Smoothing Cap I need to replace the smoothing cap on my Decca Deccalian Mk4 Extension Speaker. It's a 32uf 32uf (Voltage numbers rubbed). This cap has 4 tags and the only modern examples I can Find are 32uf 32uf 500v but only 3 tags?. Can these be used to replace...Thanks

25th Dec 2017, 12:13 am	#2
julie_m Dekatron Join Date: May 2008 Location: Derby, UK. Posts: 7,735	Re: Decca Deccalain Mk4 Smoothing Cap You can use a 3-terminal can capacitor as a replacement if and only if the two negatives are joined together (they ought to be joined together anyway, but may not if a voltage-doubling rectifier is used). Otherwise you probably will need two separate capacitors. 500V will be fine for a record player. __________________ If I have seen further than others, it is because I was standing on a pile of failed experiments.

25th Dec 2017, 12:24 am	#3
skamanuk Retired Dormant Member Join Date: Apr 2013 Location: London, UK. Posts: 245	Re: Decca Deccalain Mk4 Smoothing Cap It appears the Rectifier Valve is EZ80 The others being ECC83 X2 & EL84.

25th Dec 2017, 1:38 am	#4
AC/HL Dekatron Join Date: Nov 2003 Location: Heckmondwike, West Yorkshire, UK. Posts: 9,643	Re: Decca Deccalian Mk4 Smoothing Cap Both negatives are connected to the chassis, this is a conventional circuit: http://www.service-data.com/section....deccalian-mk-4, so a standard 3 terminal can will be OK. The highest voltage quoted on the circuit diagram is 300V, so anything higher should be OK.