|
Vintage Television and Video Vintage television and video equipment, programmes, VCRs etc. |
|
Thread Tools |
23rd Apr 2017, 9:52 pm | #1 |
Pentode
Join Date: Jan 2014
Location: Doncaster, South Yorkshire, UK.
Posts: 158
|
Sony KV1320/1300UB
I have just restored both a KV1300 and a 1320UB (thanks to members of this forum for parts help!)
On both these sets, the picture size /EHT regulation does not seem great. At a reasonable Brightness/Contrast settings, the picture size increases and the raster crumples and the sides become bowed. at low settings the geometry is very good. I remember I has a 1320 many years ago with the same effect. Is this normal for these early sets? The picture quality otherwise is very good. The KV1320UB is a Mk1 with the 3AT2 EHT rectifier and the Kv1300UB has a silicon rectifier. The results are the same on both sets. The emission of the 3AT2 seems good. Just need to check before I go investigating a possible issue. best regards Paul |
24th Apr 2017, 9:37 pm | #2 |
Dekatron
Join Date: Apr 2005
Location: North Wales, UK.
Posts: 6,925
|
Re: Sony KV1320/1300UB
I've had this when the CRT is getting a bit low emission and takes too much current, though it's pretty obvious from the poor picture you get if this is the case.
I'd hang a meter on the HT line to see if it's dropping. Glyn |
25th Apr 2017, 4:07 pm | #3 |
Heptode
Join Date: Jan 2008
Location: Oslo, Norway.
Posts: 632
|
Re: Sony KV1320/1300UB
|
27th Apr 2017, 2:13 pm | #4 |
Dekatron
Join Date: Apr 2005
Location: North Wales, UK.
Posts: 6,925
|
Re: Sony KV1320/1300UB
Good point, Hans, but you'd turn everything up to get a reasonable picture so that may well load the EHT. Possibly it might be a leak in the CRT rather than low emission.
Glyn |