28th May 2020, 5:05 pm | #1 |
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
|
28th May 2020, 5:08 pm | #2 |
Moderator
Join Date: Jan 2003
Location: Ipswich, Suffolk, IP4, UK.
Posts: 21,289
|
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 |
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 |
Moderator
Join Date: Jan 2003
Location: Ipswich, Suffolk, IP4, UK.
Posts: 21,289
|
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 |
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 |
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 |
Moderator
Join Date: Jan 2003
Location: Ipswich, Suffolk, IP4, UK.
Posts: 21,289
|
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 |
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
|
28th May 2020, 6:36 pm | #9 |
Moderator
Join Date: Jan 2003
Location: Ipswich, Suffolk, IP4, UK.
Posts: 21,289
|
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, 10:44 am | #10 | |
Dekatron
Join Date: Feb 2007
Location: Leominster, Herefordshire, UK.
Posts: 16,535
|
Re: Ekco U199
Quote:
__________________
....__________ ....|____||__|__\_____ .=.| _---\__|__|_---_|. .........O..Chris....O |
|
29th May 2020, 12:02 pm | #11 |
Moderator
Join Date: Jun 2003
Location: Oxford, UK
Posts: 27,957
|
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 |
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 |
Dekatron
Join Date: Dec 2004
Location: East Yorkshire, UK.
Posts: 3,988
|
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 |
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. |
29th May 2020, 4:17 pm | #15 | |
Dekatron
Join Date: Dec 2004
Location: East Yorkshire, UK.
Posts: 3,988
|
Re: Ekco U199
Quote:
John.
__________________
My favourite text message "I'll be there in five minutes, if not read again" |
|
2nd Jun 2020, 4:34 pm | #16 |
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
|
2nd Jun 2020, 4:35 pm | #17 |
Moderator
Join Date: Jan 2003
Location: Ipswich, Suffolk, IP4, UK.
Posts: 21,289
|
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 |
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 |
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 |
Moderator
Join Date: Jan 2003
Location: Ipswich, Suffolk, IP4, UK.
Posts: 21,289
|
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. |