|
Vintage Television and Video Vintage television and video equipment, programmes, VCRs etc. |
|
Thread Tools |
28th Sep 2019, 9:25 pm | #1 |
Tetrode
Join Date: Sep 2019
Location: Aalborg, Denmark
Posts: 97
|
B&O Capri 606 TV (17") restoration
Hi,
I recently acquired a Bang & Olufsen Capri 606 TV, 17", from 1960. The set was stored indoors, and it sat unused since at least the late 70'ies or early 80'ies. So it was more or less covered in dust. My plan is to get this TV set working again, but I have by no means any expertise with old TVs - only modern hardware with ICs and such. It uses a AW43-88 CRT, my particular CRT looks to be the original one from Philips. The glass surrounding the gun looks a bit dark at some parts. The flyback looks visually good. All tubes seem to have an equal amount of dust of them, so they might all be original. I can see some of the smaller electrolytic caps have leaked, so I would need to replace those before even attempting to power it on. My question is: I'd prefer to bring the set up on a variac and isolation transformer, but I'm unsure if bringing it up on one can potentially damage anything due to too low voltage for a too long time. Should any tubes generally be removed before attempting this? I have attached the schematic, if it helps. Thanks. |
29th Sep 2019, 10:02 am | #2 |
Hexode
Join Date: Mar 2014
Location: Dublin, Ireland
Posts: 398
|
Re: B&O Capri 606 TV (17") restoration
Hi & welcome on board
The approach you suggest is fine - replace any visually defective components and then power up on variac - I’d be inclined to remove EHT rectifier for first power-up - beautiful schematic with a lot of info - best of luck Rgds John Last edited by kan_turk; 29th Sep 2019 at 10:06 am. Reason: Words omitted |
29th Sep 2019, 1:40 pm | #3 |
Dekatron
Join Date: Sep 2015
Location: Southwold, Suffolk, UK.
Posts: 8,327
|
Re: B&O Capri 606 TV (17") restoration
This looks have a 2 stage AF section with NFB and possibly 2 speakers. I'd be interested to learn how good this sounds when fixed.
__________________
Edward. |
29th Sep 2019, 7:05 pm | #4 |
Tetrode
Join Date: Sep 2019
Location: Aalborg, Denmark
Posts: 97
|
Re: B&O Capri 606 TV (17") restoration
Thank you both of you.
I'll be sure to remove the DY87 when powering up then - would also be much safer, when there is no EHT. Edward, it has one speaker only - the 21" one seems to have two. I'll make a high quality sound recording, and post some pictures of the progress. Right now I have carefully removed the CRT in order to clean the front glass. The previous owner was a bit of a smoker. The metal screen between the CRT and front glass also badly needs a new sealing to the CRT - the old foam had turned to dust. I'll try with some 3M 4516 vinyl foam tape and see how that works out. |
29th Sep 2019, 10:49 pm | #5 |
Hexode
Join Date: Jan 2005
Location: Waterford, Republic of Ireland
Posts: 259
|
Re: B&O Capri 606 TV (17") restoration
Love to see some ‘before’ pictures
|
30th Sep 2019, 9:54 am | #6 |
Dekatron
Join Date: Apr 2005
Location: North Wales, UK.
Posts: 6,916
|
Re: B&O Capri 606 TV (17") restoration
I'd be tempted to remove the PY88 and the CRT base while you reform the main capacitors - the variac will make a good job of that. The circuit is typical B&O - looks normal on first sight, but there are some interesting flourishes.
Depending on how dry the set was in storage, it's often an idea to make sure the LOPT is bone dry, either by removal and keeping it in a warm place (not sure how easy this is on this chassis) or else by passing a low current through the overwind - there are details on how to do this elsewhere. LOPTs were certainly a weak spot on the B&O colour chassis as we all know! The frame stage looks particularly interesting, and I suspect some capacitor replacement will be needed here, but I think it should provide a very linear picture. Some photos would be great so we can see what it looks like. Good luck! |
30th Sep 2019, 6:41 pm | #7 |
Tetrode
Join Date: Sep 2019
Location: Aalborg, Denmark
Posts: 97
|
Re: B&O Capri 606 TV (17") restoration
Thank you very much. The more I look at it, the more I think the set has been used a lot. But it is hard to tell for me what is "tar" and what is actually due to use. The darkened CRT base concerns me a bit, but perhaps it is normal. It's shown in the last attached picture.
The first pic shows what the Capri 606 looked like when it was taken out of storage. Second pic shows what a bit of cleaning could do. Third picture shows the flyback - hard to get a good picture, but it seems fine. As it is "16 kV only" I was hoping it would last longer than one designed for larger tubes/anode voltages. Fourth picture shows the PCBs/chassis - I cleaned a few of the tubes carefully, mainly to get an impression of how much is nicotine and what is dust. The 606 range was the first year the "line automatic" feature was introduced - making horizontal hold adjustment not required anymore. |
30th Sep 2019, 8:45 pm | #8 |
Dekatron
Join Date: Apr 2005
Location: North Wales, UK.
Posts: 6,916
|
Re: B&O Capri 606 TV (17") restoration
Firstly, that CRT looks fine to me - the 'silvering' is normal. Also the PCB would look much darker around the valveholders if it was a very high mileage set.
I think some electrolytics are in order - in fact, most of them. However I suspect those green ones will be OK, though someone more familiar with them will give you a definitive answer. Obviously this was a TV before B&O developed their house style! |
30th Sep 2019, 10:51 pm | #9 |
Nonode
Join Date: Sep 2017
Location: Stockport, Cheshire, UK.
Posts: 2,002
|
Re: B&O Capri 606 TV (17") restoration
A very neatly laid out PCB inside, rather like some rats nests some sets have inside.
__________________
Hello IT: Have you Tried Turning It Off & On Again? |
1st Oct 2019, 9:02 am | #10 |
Nonode
Join Date: May 2006
Location: St Albans, Herts, UK.
Posts: 2,193
|
Re: B&O Capri 606 TV (17") restoration
I wonder when their style changed and what their contemporaries were like in this era.
__________________
All the very best, Tas |
1st Oct 2019, 9:12 am | #11 |
Dekatron
Join Date: Dec 2007
Location: Haarlem, Netherlands
Posts: 4,199
|
Re: B&O Capri 606 TV (17") restoration
Their schematic style sure changed for the worse at some point, I'm amazed at how clear this one is.
|
1st Oct 2019, 9:30 am | #12 |
Rest in Peace
Join Date: Sep 2010
Location: Ripley, Derbyshire, UK.
Posts: 785
|
Re: B&O Capri 606 TV (17") restoration
It might be a good idea to slip a small plastic cup or something similar over the end of the anode lead of the DY87 if you intend trying the set without the DY87 fitted.
It would be a pity if the EHT was to jump from the anode connector to the L.O.P.T. windings, and ruin the transformer. Just a thought. Good luck wih it. B&O's always were one of my favourite makes to work on. Tony. |
1st Oct 2019, 12:36 pm | #13 |
Dekatron
Join Date: Apr 2005
Location: North Wales, UK.
Posts: 6,916
|
Re: B&O Capri 606 TV (17") restoration
I think it was around 1970 that thy started to be style conscious. Their TVs looked a bit more upmarket than their contemporaries with controls hidden in drawers that clicked in and out and had a quality feel to them (eat your heart out, G11!). Then their hi-fi became slimmer culminating in the mid-seventies when everything looked sleek and stylish, even the TVs. I'm sure Tim will have his own take on this, though!
They always were nicely made and usually spared a thought for the engineer - as soon as you worked out how they came apart.... |
1st Oct 2019, 5:36 pm | #14 | |
Octode
Join Date: Apr 2007
Location: Hampshire, UK.
Posts: 1,576
|
Re: B&O Capri 606 TV (17") restoration
Quote:
Although there were a few experiments before, the Beomaster 900K was the first really successful export orientated model, it appeared in 1963. Had the company not pursued this plan the chances are that they would have gone the way of their Danish rivals Arena (who? exactly!), who were once of a similar size to B&O but are now all but forgotten. See also: The British consumer electronics industry. |
|
1st Oct 2019, 6:40 pm | #15 |
Tetrode
Join Date: Sep 2019
Location: Aalborg, Denmark
Posts: 97
|
Re: B&O Capri 606 TV (17") restoration
I'm really surprised and amazed about the amount of attention this has gotten. Thank you!
Welsh Anorak, I'll make sure to follow your advice of removing PY88 and CRT socket base as well. Tony/Boxdoctor: I'll be sure to isolate the anode cap of DY87 so it can't arch anywhere. Good point. I'd also have to agree with Studio263 on this - one should consider the B&O design that pre-dates the Capri series as something that looks like this: https://www.radiomuseum.org/r/bang_grand_prix_513.html , or with speakers below and on wheels. In my opinion the only thing that makes the Capri 514, 606 and 607 particularly nice looking is the thing that is always missing: The legs. The 514 with legs is showcased here: https://www.bang-olufsen.com/en/story/93-years-of-magic I plan to get a wood-turner to make some legs in teak. The threads are already present inside the cabinet. But getting new teak to match teak from 1960 is probably not going to be easy. To find something which looks more David Lewis/Henning Moldenhawer-like, in my view it would be the Capri Moderne from 1963. It's probably helped a bit by having one of the first "square" CRTs, at least for B&O. I've never seen one in real life though. |
1st Oct 2019, 7:01 pm | #16 |
Dekatron
Join Date: Jun 2005
Location: Warnham, West Sussex. 10 miles south of DORKING.
Posts: 9,147
|
Re: B&O Capri 606 TV (17") restoration
That looks like a Philips LOPT and scan coils. J.
|
2nd Oct 2019, 5:17 pm | #17 |
Dekatron
Join Date: Apr 2005
Location: North Wales, UK.
Posts: 6,916
|
Re: B&O Capri 606 TV (17") restoration
I take it Arena collaborated with Rank in the Seventies to produce hi-fi systems? They looked nice, but weren't particularly reliable and certainly weren't like B&O!
|
4th Oct 2019, 11:22 am | #18 |
Dekatron
Join Date: Apr 2005
Location: North Wales, UK.
Posts: 6,916
|
Re: B&O Capri 606 TV (17") restoration
...and I see one is in the Items Offered on this forum! ISTR Arena was the badge on more upmarket Z718 and T20 TVs.
|
4th Oct 2019, 11:51 am | #19 |
Dekatron
Join Date: Jun 2009
Location: Staffordshire Moorlands, UK.
Posts: 5,270
|
Re: B&O Capri 606 TV (17") restoration
there's a comprehensive account of Arena under Rank's ownership on the danish wikipedia site.
__________________
Kevin |
31st Oct 2019, 9:28 pm | #20 |
Tetrode
Join Date: Sep 2019
Location: Aalborg, Denmark
Posts: 97
|
Re: B&O Capri 606 TV (17") restoration
Status so far is that
- Glass and CRT cleaned beautifully. - all electrolytics besides the filter caps have been replaced - the 0.1 uF from grid of PL36 to ground is replaced (looked wonky and cracked open) - PL36 is gassy, so will need a replacement for that. - The 10n across the line cap has separated into two parts (on purpose?) - The 4,7n cap marked with "23" in the schematic was disconnected. The 1k resistor marked with "22" was replaced with what looks like a 7-10W 1k power resistor. I reverted it back to follow the schematic, but I'm unsure what the purpose of that modification would do. Stability? Questions: 1) The coil AT4008 comes in a to me quite strange form factor. It is enclosed in a metal tube with a plastic hex nut at the end and with a ~2cm wire coming out of the center of the hex nut. It looks as if it should go somewhere, or should it possibly just float in air? I have attached an image of it. 2) DY87 should be the same as DY86 except for a silicone grease covering for humid conditions - is this just your average silicone grease? When dusting off mine, I removed what might have been silicone grease on the outside. |