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Old 9th Jun 2018, 6:07 pm   #1
Geoff 555
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Default Ekco TMB272 TV switch.

Hello does any one have a ON/OFF - brightness - volume control please.
The switch contacts are burnt, virtually nothing left, and the brightness control intermittent, so I am afraid beyond rescue.
Thank you very much.
Cheers.
Geoff.

Sorry, model correction, should be.
TMB275.
Thanks.

Last edited by Geoff 555; 9th Jun 2018 at 6:23 pm. Reason: Missed out a letter in title.
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Old 9th Jun 2018, 6:32 pm   #2
dazzlevision
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Default Re: Ekco TB275 tv.

Shouldn’t the model number be TMB272? The 12V/240V “portable” set.
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Old 10th Jun 2018, 1:22 pm   #3
Geoff 555
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Default Re: Ekco TMB275 TV switch.

Yes probably, sometimes I wonder why I bother, old age I am afraid, I did look the model up and in between looking at the sheet and typing the thread out, a matter of a minute, I got it wrong AGAIN.

My sincere apologies to all.
TMB272.
Cheers.
Geoff.
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Old 10th Jun 2018, 2:58 pm   #4
Sideband
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Default Re: Ekco TMB275 TV switch.

Values? Shaft length? I presume it's a concentric control. I have a few RS replacements so I can have a look through them but I don't know the values you want.
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Old 12th Jun 2018, 7:43 pm   #5
Restoration73
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Default Re: Ekco TMB272 TV switch.

Brightness (outer) 50k lin, Volume (inner) 500k log w/dpst switch. The 50k may respond
to cleaning. It is possible to "marry" the bright pot to a long spindle volume pot if
you can turn down the spindle to 3/16" on a lathe, and grind a flat on the end.
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Old 13th Jun 2018, 9:23 pm   #6
simpsons
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Default Re: Ekco TMB272 TV switch.

The Radio Museum has an article which although speaks of a repair to a volume control could well be the answer. "Repairing old potentiometers"

It calls for the replacement of the track from a donar control. Similarly, the on/off can be made serviceable. This, at least, would allow you to keep the concentric control and fixing arrangements as per the original.

Chris
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Old 13th Jun 2018, 9:54 pm   #7
simpsons
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Default Re: Ekco TMB272 TV switch.

I've just seen on eBay a concentric dual control for Russian radio "Stereo Dual 2 Gang 4.7M Ohm Potentiometer" for just under a tenner which, with a little craftmanship, could be the basis for a donar control.

Also Fender Guitar amps use them see Rich Tone Music.

Chris

Last edited by simpsons; 13th Jun 2018 at 10:06 pm. Reason: Additional information
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Old 14th Jun 2018, 11:51 am   #8
Geoff 555
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Default Re: Ekco TMB272 TV switch.

Many thanks to all. The track on the volume control will need replacing, it is completely worn out. The brightness control responds to a 'squirt' but only for a short time. There is not a lot left of the switch contacts.
These faults were noted a few years ago and I decided not to strip the thing apart again just in case something broke and it became scrap.
Now I have been given some further help then it will be stripped and sorted.
Many thanks again, confidence was somewhat lacking and a 'push' was needed.
Cheers.
Geoff.
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