UK Vintage Radio Repair and Restoration Powered By Google Custom Search Vintage Radio and TV Service Data

Go Back   UK Vintage Radio Repair and Restoration Discussion Forum > Specific Vintage Equipment > Vintage Radio (domestic)

Notices

Vintage Radio (domestic) Domestic vintage radio (wireless) receivers only.

Reply
 
Thread Tools
Old 19th Jun 2021, 7:49 pm   #1
Frankcawthron
Diode
 
Join Date: Jun 2021
Location: Wakefield, West Yorkshire, UK.
Posts: 1
Default Ekco u243/1

Hi. I have an Ekco U243/1 radio which works but it only tunes in strong signals on MW and FM. When I turn the tuning knob I get a lot of crackles through the speaker, the sound is not bad plenty of volume but a little distorted. I have cleaned the wave change contacts and the volume control as well as all the valve bases and pins; and generally cleaned both chassis and cabinet

I replaced capacitor C42 with a 0.1uF instead of a 0.01uF because I didn’t have anything else. This is the grid coupling capacitor for the output valve, but it didn’t make any difference to the overall sound quality.

I haven’t replaced any shooting caps don’t have any, would this be the likely cause of the problems? The hum level through the speaker is OK.

Any ideas welcome.
Frankcawthron is offline   Reply With Quote
Old 19th Jun 2021, 8:14 pm   #2
Station X
Moderator
 
Station X's Avatar
 
Join Date: Jan 2003
Location: Ipswich, Suffolk, IP4, UK.
Posts: 18,223
Default Re: Ekco u243/1

Excuse my ignorance, but what's a shooting capacitor?
__________________
Graham. Forum Moderator

Keep the soldering iron hot.
Station X is online now   Reply With Quote
Old 19th Jun 2021, 10:04 pm   #3
Nuvistor
Dekatron
 
Nuvistor's Avatar
 
Join Date: Aug 2013
Location: Wigan, Greater Manchester, UK.
Posts: 8,573
Default Re: Ekco u243/1

Crackling when adjusting the tuning capacitor is very often due to shorts between the vanes or poor earthing on the moving vanes.
What service information are you using the output grid coupler on my diagram, manufacturer’s is C49? I don’t have the /1 version.
Yes Shooting capacitor, that’s new to me.
Presume you have checked voltages for the distortion problem, is it at low, high or any volume level?
__________________
Frank
Nuvistor is offline   Reply With Quote
Old 19th Jun 2021, 10:11 pm   #4
vinrads
Nonode
 
Join Date: Feb 2009
Location: Chesterfield, Derbyshire, UK.
Posts: 2,868
Default Re: Ekco u243/1

Quote:
Originally Posted by Station X View Post
Excuse my ignorance, but what's a shooting capacitor?
Smoothing maybe , Mick.
vinrads is offline   Reply With Quote
Old 19th Jun 2021, 10:12 pm   #5
rambo1152
Nonode
 
rambo1152's Avatar
 
Join Date: May 2010
Location: Manchester, UK.
Posts: 2,789
Default Re: Ekco u243/1

Shooting
Smoothing

Unlikely typo, but it's all I can think of.

(X with Mick.)
__________________
--
Graham.
G3ZVT
rambo1152 is offline   Reply With Quote
Old 20th Jun 2021, 8:00 am   #6
jonnybear
Octode
 
jonnybear's Avatar
 
Join Date: Nov 2010
Location: Cullompton, Devon, UK.
Posts: 1,428
Default Re: Ekco u243/1

Quote:
Originally Posted by rambo1152 View Post
Shooting
Smoothing

Unlikely typo, but it's all I can think of.

(X with Mick.)
Could be the little black Hunts they are about the size of .22 bullets? LOL
John
jonnybear is offline   Reply With Quote
Old 20th Jun 2021, 9:27 am   #7
Station X
Moderator
 
Station X's Avatar
 
Join Date: Jan 2003
Location: Ipswich, Suffolk, IP4, UK.
Posts: 18,223
Default Re: Ekco u243/1

Quote:
Originally Posted by rambo1152 View Post
Shooting
Smoothing

Unlikely typo, but it's all I can think of.

(X with Mick.)
Sound like that's the correct answer.

Getting back to the OP's post, C42 is not the AF coupling capacitor. The AF coupling capacitor is C49 (Manufacturer's sheet) or C52 (Trader Sheet).

I suggest fitting the correct value (0.01uF) AF coupling capacitor and then checking the voltages around the PSU and output stages.
__________________
Graham. Forum Moderator

Keep the soldering iron hot.
Station X is online now   Reply With Quote
Old 20th Jun 2021, 9:57 am   #8
Nickthedentist
Dekatron
 
Nickthedentist's Avatar
 
Join Date: Jan 2005
Location: Oxford, UK.
Posts: 15,608
Default Re: Ekco u243/1

This is the annoying kind of typo smartphones and tablets sometimes create when they think they know best!
Nickthedentist is offline   Reply With Quote
Reply

Thread Tools



All times are GMT. The time now is 12:23 am.


All information and advice on this forum is subject to the WARNING AND DISCLAIMER located at https://www.vintage-radio.net/rules.html.
Failure to heed this warning may result in death or serious injury to yourself and/or others.


Powered by vBulletin®
Copyright ©2000 - 2021, vBulletin Solutions, Inc.
Copyright ©2002 - 2021, Paul Stenning.