Bush TV22 Picture Fault - UK Vintage Radio Repair and Restoration Discussion Forum

taipai_royal · 29th Mar 2007, 8:43 pm

My Bush TV22 has recently developed what seems to be a sound related picture fault. The fault shows as flickering horizontal lines that are more pronouced with speech than with music, this is also present with the volume at zero, but absent with the audio cables removed.
Any suggestions greatly appreciated.
Graham.

Steve_P · 29th Mar 2007, 8:56 pm

I'd check caps like C52 first.

This is known as Sound on Vision. You've not carried it about and disturbed anything. Easy to do.

Could be anything, this. Has any alignment slipped. If not check valves and capacitors in the First and Sound IF's. Remember the sound is AM, so even modulated sound can cause this if it gets too high.

Also, check the external modulator hasn't slipped.

Cheers,

Steve P

taipai_royal · 29th Mar 2007, 9:54 pm

Thanks for the pointers Steve. Yes I had just moved the sets location and may of disturbed something, so I will check out the obvious first (loose valves, my dodgy soldering) around the sound IF coils.
C52 are you looking at Trader 1003/T15?
Regards Graham.

Steve_P · 29th Mar 2007, 10:07 pm

I was looking at T1091. C52 - It's in series with the Volume Control.

Cheers

Steve P

taipai_royal · 29th Mar 2007, 10:34 pm

Ah yes C48 on this trader. Thanks again Steve.

Danny · 30th Mar 2007, 1:46 am

Hi what happens if you move the tuning knob on the back?
Just a thought. Danny

taipai_royal · 30th Mar 2007, 7:15 am

Quote:

Originally Posted by Danny

Hi what happens if you move the tuning knob on the back?

Yes that's it,one small tweak it's gone,doh how the hell did that change?
I only moved the set from one side of the room to other. Well, that's egg on my face.
Thanks Danny,thanks Steve.
Graham.

Mike Phelan · 30th Mar 2007, 7:24 am

It did sound like archetypal off-tune SOV!

29th Mar 2007, 8:43 pm	#1
taipai_royal Pentode Join Date: Apr 2003 Location: Didcot UK Posts: 121	Bush TV22 Picture Fault My Bush TV22 has recently developed what seems to be a sound related picture fault. The fault shows as flickering horizontal lines that are more pronouced with speech than with music, this is also present with the volume at zero, but absent with the audio cables removed. Any suggestions greatly appreciated. Graham.

29th Mar 2007, 8:56 pm	#2
Steve_P Dekatron Join Date: Sep 2003 Location: Bolton, Greater Manchester, UK. Posts: 6,644	Re: Bush TV22 Picture Fault I'd check caps like C52 first. This is known as Sound on Vision. You've not carried it about and disturbed anything. Easy to do. Could be anything, this. Has any alignment slipped. If not check valves and capacitors in the First and Sound IF's. Remember the sound is AM, so even modulated sound can cause this if it gets too high. Also, check the external modulator hasn't slipped. Cheers, Steve P __________________ If we've always had it, why is the Car Boot open? You're not sneaking another Old TV in are you...?

29th Mar 2007, 9:54 pm	#3
taipai_royal Pentode Join Date: Apr 2003 Location: Didcot UK Posts: 121	Re: Bush TV22 Picture Fault Thanks for the pointers Steve. Yes I had just moved the sets location and may of disturbed something, so I will check out the obvious first (loose valves, my dodgy soldering) around the sound IF coils. C52 are you looking at Trader 1003/T15? Regards Graham.

29th Mar 2007, 10:07 pm	#4
Steve_P Dekatron Join Date: Sep 2003 Location: Bolton, Greater Manchester, UK. Posts: 6,644	Re: Bush TV22 Picture Fault I was looking at T1091. C52 - It's in series with the Volume Control. Cheers Steve P __________________ If we've always had it, why is the Car Boot open? You're not sneaking another Old TV in are you...?

29th Mar 2007, 10:34 pm	#5
taipai_royal Pentode Join Date: Apr 2003 Location: Didcot UK Posts: 121	Re: Bush TV22 Picture Fault Ah yes C48 on this trader. Thanks again Steve.

30th Mar 2007, 1:46 am	#6
Danny Heptode Join Date: Jul 2003 Location: North Walsham, Norfolk, UK. Posts: 516	Re: Bush TV22 Picture Fault Hi what happens if you move the tuning knob on the back? Just a thought. Danny

30th Mar 2007, 7:24 am	#8
Mike Phelan Dekatron Join Date: Nov 2003 Location: Near Leeds, West Yorkshire, UK Posts: 4,609	Re: Bush TV22 Picture Fault It did sound like archetypal off-tune SOV! __________________ Mike.