Ekco U199 - UK Vintage Radio Repair and Restoration Discussion Forum

rockinmark · 28th May 2020, 5:05 pm

Hi I have picked up a ekco u199 can someone tell me what the name of this is in picture 1 and what can I replace it with also I'm changing the wax capacitors the c29= 0.05uf can I use 47nf and the type in picture 2

Station X · 28th May 2020, 5:08 pm

Picture 1 is a 270R 5% 0.3A high wattage "Polo Mint" resistor. It'll only need replacing if it's open circuit.

47nF is 0.047uF so you can use it to replace 0.05uF.

ms660 · 28th May 2020, 5:10 pm

Radiospares used to supply those dropper sections.

Lawrence.

Station X · 28th May 2020, 5:20 pm

See here:-

https://www.vintage-radio.net/forum/....php?p=1095247

As I said no need to replace it if it tests OK.

ms660 · 28th May 2020, 5:41 pm

We had decent stocks of them both in the service van spares kit and in the workshop, we called them a bunch of grapes if there was more than one on an old mains dropper as we would often find in a TV.

Lawrence

rockinmark · 28th May 2020, 5:54 pm

One of the legs have broken off leaving the hair wire like you see in picture 3 if I measure across it's not open circuit

Station X · 28th May 2020, 6:08 pm

270R at 0.3A is near enough 25 Watts.

Something like this could be used to replace it.

https://uk.rs-online.com/web/p/panel...stors/1073958/

The use of an RS resistor suggests it's a repair though. You may be able to find something closer to the original value. It's wired across R16 the dropper resistor.

rockinmark · 28th May 2020, 6:24 pm

Ok thanks for that Graham this why I couldn't find it on the schematic then the yellow capacitor is for c29 so I'm not sure if yellow one would be ok because it's on the mains I think

Station X · 28th May 2020, 6:36 pm

C29 is connected across the mains supply, so needs to be a Class X component. X is a cross (across).

Just snip it our for now though.

Herald1360 · 29th May 2020, 10:44 am

Quote:

Originally Posted by Station X

270R at 0.3A is near enough 25 Watts.

Something like this could be used to replace it.

https://uk.rs-online.com/web/p/panel...stors/1073958/

The use of an RS resistor suggests it's a repair though. You may be able to find something closer to the original value. It's wired across R16 the dropper resistor.

That's R19 in the Trader sheet snippet shown. (R16B in the manufacturer's version).

paulsherwin · 29th May 2020, 12:02 pm

You might want to consider converting it to a capacitive or diode dropper given that the dropper's in a bit of a state.

peter_sol · 29th May 2020, 12:36 pm

That should be 200 Ohms then.

Mark I have 2 100 ohms sections in series you could mount on the chassis and I am in

Welwyn Garden City.

I will PM you.

60 oldjohn · 29th May 2020, 2:19 pm

I think there may be a mistake on the circuit diagram, The scale lamp 110-120v ?

John.

ms660 · 29th May 2020, 2:46 pm

Do you mean in the Trader sheet? If so then that looks like a voltage selection position to me.

Lawrence.

60 oldjohn · 29th May 2020, 4:17 pm

Quote:

Originally Posted by ms660

Do you mean in the Trader sheet? If so then that looks like a voltage selection position to me.

Lawrence.

#8 I think you are right,

John.

rockinmark · 2nd Jun 2020, 4:34 pm

I have got x2 type capacitor for the c29 as in post #9 does it matter what way round it goes

Station X · 2nd Jun 2020, 4:35 pm

No.

rockinmark · 2nd Jun 2020, 4:53 pm

Ok thanks for the quick reply Graham

rockinmark · 2nd Jun 2020, 6:21 pm

The radio is still quiet at full volume what else should I look at?

Station X · 3rd Jun 2020, 9:21 am

When you say quiet do you mean silent?

First thing to check is the HT at the reservoir cap. Manufacturers sheet says to expect 182 VDC.

28th May 2020, 5:05 pm	#1
rockinmark Heptode Join Date: Sep 2014 Location: St Albans, Hertfordshire, UK. Posts: 594	Ekco U199 Hi I have picked up a ekco u199 can someone tell me what the name of this is in picture 1 and what can I replace it with also I'm changing the wax capacitors the c29= 0.05uf can I use 47nf and the type in picture 2 Attached Thumbnails

28th May 2020, 5:08 pm	#2
Station X Moderator Join Date: Jan 2003 Location: Ipswich, Suffolk, IP4, UK. Posts: 21,288	Re: Ekco u199 Picture 1 is a 270R 5% 0.3A high wattage "Polo Mint" resistor. It'll only need replacing if it's open circuit. 47nF is 0.047uF so you can use it to replace 0.05uF. __________________ Graham. Forum Moderator Reach for your meter before you reach for your soldering iron.

28th May 2020, 5:10 pm	#3
ms660 Dekatron Join Date: Apr 2011 Location: Cornwall, UK. Posts: 13,454	Re: Ekco u199 Radiospares used to supply those dropper sections. Lawrence.

28th May 2020, 5:20 pm	#4
Station X Moderator Join Date: Jan 2003 Location: Ipswich, Suffolk, IP4, UK. Posts: 21,288	Re: Ekco u199 See here:- https://www.vintage-radio.net/forum/....php?p=1095247 As I said no need to replace it if it tests OK. __________________ Graham. Forum Moderator Reach for your meter before you reach for your soldering iron.

28th May 2020, 5:41 pm	#5
ms660 Dekatron Join Date: Apr 2011 Location: Cornwall, UK. Posts: 13,454	Re: Ekco U199 We had decent stocks of them both in the service van spares kit and in the workshop, we called them a bunch of grapes if there was more than one on an old mains dropper as we would often find in a TV. Lawrence

28th May 2020, 5:54 pm	#6
rockinmark Heptode Join Date: Sep 2014 Location: St Albans, Hertfordshire, UK. Posts: 594	Re: Ekco U199 One of the legs have broken off leaving the hair wire like you see in picture 3 if I measure across it's not open circuit

28th May 2020, 6:08 pm	#7
Station X Moderator Join Date: Jan 2003 Location: Ipswich, Suffolk, IP4, UK. Posts: 21,288	Re: Ekco U199 270R at 0.3A is near enough 25 Watts. Something like this could be used to replace it. https://uk.rs-online.com/web/p/panel...stors/1073958/ The use of an RS resistor suggests it's a repair though. You may be able to find something closer to the original value. It's wired across R16 the dropper resistor. __________________ Graham. Forum Moderator Reach for your meter before you reach for your soldering iron.

28th May 2020, 6:24 pm	#8
rockinmark Heptode Join Date: Sep 2014 Location: St Albans, Hertfordshire, UK. Posts: 594	Re: Ekco U199 Ok thanks for that Graham this why I couldn't find it on the schematic then the yellow capacitor is for c29 so I'm not sure if yellow one would be ok because it's on the mains I think Attached Thumbnails

28th May 2020, 6:36 pm	#9
Station X Moderator Join Date: Jan 2003 Location: Ipswich, Suffolk, IP4, UK. Posts: 21,288	Re: Ekco U199 C29 is connected across the mains supply, so needs to be a Class X component. X is a cross (across). Just snip it our for now though. __________________ Graham. Forum Moderator Reach for your meter before you reach for your soldering iron.

29th May 2020, 12:02 pm	#11
paulsherwin Moderator Join Date: Jun 2003 Location: Oxford, UK Posts: 27,947	Re: Ekco U199 You might want to consider converting it to a capacitive or diode dropper given that the dropper's in a bit of a state.

29th May 2020, 12:36 pm	#12
peter_sol Octode Join Date: Aug 2003 Location: Welwyn Garden City, Herts. UK. Posts: 1,906	Re: Ekco U199 That should be 200 Ohms then. Mark I have 2 100 ohms sections in series you could mount on the chassis and I am in Welwyn Garden City. I will PM you.

29th May 2020, 2:19 pm	#13
60 oldjohn Dekatron Join Date: Dec 2004 Location: East Yorkshire, UK. Posts: 3,987	Re: Ekco U199 I think there may be a mistake on the circuit diagram, The scale lamp 110-120v ? John. __________________ My favourite text message "I'll be there in five minutes, if not read again"

29th May 2020, 2:46 pm	#14
ms660 Dekatron Join Date: Apr 2011 Location: Cornwall, UK. Posts: 13,454	Re: Ekco U199 Do you mean in the Trader sheet? If so then that looks like a voltage selection position to me. Lawrence.

2nd Jun 2020, 4:34 pm	#16
rockinmark Heptode Join Date: Sep 2014 Location: St Albans, Hertfordshire, UK. Posts: 594	Re: Ekco U199 I have got x2 type capacitor for the c29 as in post #9 does it matter what way round it goes Attached Thumbnails

2nd Jun 2020, 4:35 pm	#17
Station X Moderator Join Date: Jan 2003 Location: Ipswich, Suffolk, IP4, UK. Posts: 21,288	Re: Ekco U199 No. __________________ Graham. Forum Moderator Reach for your meter before you reach for your soldering iron.

2nd Jun 2020, 4:53 pm	#18
rockinmark Heptode Join Date: Sep 2014 Location: St Albans, Hertfordshire, UK. Posts: 594	Re: Ekco U199 Ok thanks for the quick reply Graham

2nd Jun 2020, 6:21 pm	#19
rockinmark Heptode Join Date: Sep 2014 Location: St Albans, Hertfordshire, UK. Posts: 594	Re: Ekco U199 The radio is still quiet at full volume what else should I look at?

3rd Jun 2020, 9:21 am	#20
Station X Moderator Join Date: Jan 2003 Location: Ipswich, Suffolk, IP4, UK. Posts: 21,288	Re: Ekco U199 When you say quiet do you mean silent? First thing to check is the HT at the reservoir cap. Manufacturers sheet says to expect 182 VDC. __________________ Graham. Forum Moderator Reach for your meter before you reach for your soldering iron.