11th Feb 2013, 8:08 am | #101 |
Hexode
Join Date: Nov 2009
Location: Chertsey, Surrey, UK.
Posts: 456
|
Re: My Bush TV43 restoration.
This is a pic of the 1950s table I got for my TV!
|
11th Feb 2013, 8:37 am | #102 | |
Hexode
Join Date: Nov 2009
Location: Chertsey, Surrey, UK.
Posts: 456
|
Re: My Bush TV43 restoration.
Quote:
|
|
11th Feb 2013, 9:04 am | #103 |
Dekatron
Join Date: Jun 2005
Location: Warnham, West Sussex. 10 miles south of DORKING.
Posts: 9,147
|
Re: My Bush TV43 restoration.
Phew! A lot there to think about.
The EHT lead should be OK joined the way you have done it. It's not good practise but perfectly OK for our purposes. The co-ax cable required is the type with the solid Polythene inner. It will be obvious by it's appearance. Leave the ceramic caps well alone. There is nothing wrong with them. The untidy appearance of the lead out wires is normal. They have been dipped in a coating to keep the damp out. Never known a faulty one. The silver foil is screening to prevent interference from the line timebase entering neighbouring radio receivers. It's no longer a problem and has been rendered obsolete. They packed crisps in greaseproof paper bags back in 1954... Wire glue appears to be the work of the devil.. You may be able to replace individual pins in the B9A valveholder if you can find an exact style. It's better replaced but leave it till you have a good 'first light'. I'll post you some cavity connector pictures later today. I have a couple of tubes on the bench so no problem. My Gran would have said 'It will all end in tears' so I want you to prove her wrong! Regards, John. PS I have discovered a similar valve holder in my stocks. It does not have the chassis mounting ring but looks similar 'guts' so you should be able to extract the pins. I also have some EHT lead that should do the trick. You can have them FOC if you need them. I would suggest you get it up and 'working' as it is. Valveholder replacement can lead to mistakes.J. Last edited by Heatercathodeshort; 11th Feb 2013 at 9:18 am. |
11th Feb 2013, 10:02 am | #104 |
Dekatron
Join Date: Jun 2005
Location: Warnham, West Sussex. 10 miles south of DORKING.
Posts: 9,147
|
Re: My Bush TV43 restoration.
Hello again Stephen,
I have attached pictures of the ceramic valveholder for comparison. Also attached are pictures of the CT8 cavity connector and another shows suitable EHT lead. Early tubes had the standard valve type top cap connector but all later tubes used the CT8. One picture shows the adaptor that converted the early cap to the later CT8 type when fitting more up to date tube replacements. Later receivers, due to an increase in EHT voltage are fitted with the familiar insulating plastic cap. J. |
11th Feb 2013, 10:05 am | #105 |
Dekatron
Join Date: Jun 2005
Location: Warnham, West Sussex. 10 miles south of DORKING.
Posts: 9,147
|
Re: My Bush TV43 restoration.
Showing method of removal from CRT. I would suggest you leave well alone for present. Great care must be taken around this area of the tube as it can be easily damaged. Old glass needs to be treated with espect. J.
|
11th Feb 2013, 11:57 am | #106 | |
Octode
Join Date: Jan 2009
Location: Falmouth, Cornwall, UK.
Posts: 1,990
|
Re: My Bush TV43 restoration.
Quote:
Stephen |
|
12th Feb 2013, 12:29 pm | #107 |
Dekatron
Join Date: Jun 2005
Location: Warnham, West Sussex. 10 miles south of DORKING.
Posts: 9,147
|
Re: My Bush TV43 restoration.
Not a huge amount Stephen with these old receivers. The frame time base will produce about the same current into the deflection coils as a valve audio output stage would into a loudspeaker. The line timebase is similar but of a much more 'spiky' character. Insulation is more important with the line stage than wire thickness. The thin wires as original are more than adequate. These are minor points are are of no significance until you get something on the screen. Anything!
[I have a 78 record of 'Rule Britannia' on the turntable waiting for that moment.] Regards, John. |
12th Feb 2013, 1:27 pm | #108 |
Octode
Join Date: Jan 2009
Location: Falmouth, Cornwall, UK.
Posts: 1,990
|
Re: My Bush TV43 restoration.
lol
Stephen |
12th Feb 2013, 2:00 pm | #109 | |
Hexode
Join Date: Nov 2009
Location: Chertsey, Surrey, UK.
Posts: 456
|
Re: My Bush TV43 restoration.
Quote:
I am dreading having to replace the ceramic valve holder and had been thinking if it was possible to replace just the 2 damaged pin contacts, that would lead to less chance of a mistake or component damage. and thanks for the offer of the valve holder and EHT lead, I will test the TV first Last edited by audion_1908; 12th Feb 2013 at 2:01 pm. Reason: no The |
|
12th Feb 2013, 2:33 pm | #110 | |
Hexode
Join Date: Nov 2009
Location: Chertsey, Surrey, UK.
Posts: 456
|
Re: My Bush TV43 restoration.
Quote:
|
|
12th Feb 2013, 2:39 pm | #111 | |
Hexode
Join Date: Nov 2009
Location: Chertsey, Surrey, UK.
Posts: 456
|
Re: My Bush TV43 restoration.
Quote:
|
|
12th Feb 2013, 2:54 pm | #112 | |
Hexode
Join Date: Nov 2009
Location: Chertsey, Surrey, UK.
Posts: 456
|
Re: My Bush TV43 restoration.
Quote:
|
|
12th Feb 2013, 5:47 pm | #113 |
Octode
Join Date: Jan 2009
Location: Falmouth, Cornwall, UK.
Posts: 1,990
|
Re: My Bush TV43 restoration.
A picture is going to help again, one of the tube 1st anode and one of the HT end cap as it is.
Stephen |
12th Feb 2013, 6:50 pm | #114 |
Hexode
Join Date: Nov 2009
Location: Chertsey, Surrey, UK.
Posts: 456
|
Re: My Bush TV43 restoration.
If you mean the CRT, I will take some pictures of the new deflection coil wiring and the CRT EHT lead connecter, when I find my LED torch as its to dark for my phone to get a good picture.
Last edited by audion_1908; 12th Feb 2013 at 6:58 pm. Reason: missing text |
12th Feb 2013, 10:36 pm | #115 |
Hexode
Join Date: Nov 2009
Location: Chertsey, Surrey, UK.
Posts: 456
|
Re: My Bush TV43 restoration.
Here are the pictures of the EHT cap on the CRT and the CRT base.
|
12th Feb 2013, 10:39 pm | #116 | ||
Hexode
Join Date: Nov 2009
Location: Chertsey, Surrey, UK.
Posts: 456
|
Re: My Bush TV43 restoration.
Quote:
I tried to mach the colors but the old wires where very faded. |
||
12th Feb 2013, 10:41 pm | #117 |
Hexode
Join Date: Nov 2009
Location: Chertsey, Surrey, UK.
Posts: 456
|
Re: My Bush TV43 restoration.
pic of the speaker and the only rubber wire not perished in the TV!
the speaker looks ok? |
12th Feb 2013, 10:50 pm | #118 |
Hexode
Join Date: Nov 2009
Location: Chertsey, Surrey, UK.
Posts: 456
|
Re: My Bush TV43 restoration.
It is a good thing I cut the EHT lead to get the boards out then.
|
12th Feb 2013, 11:01 pm | #119 |
Dekatron
Join Date: Jun 2005
Location: Warnham, West Sussex. 10 miles south of DORKING.
Posts: 9,147
|
Re: My Bush TV43 restoration.
No need to get paranoid about the tube Stephen. I was just being a bit cautious as it is your first, or one of your first telly receivers. Just take it easy and give yourself plenty of time. Nice work by the way. That scan coil plug looks good to me that is if you have got the wires on the right pins.... So easy to make a mistake as I did a year back..What ever wire you have used will be fine. It is in no way critical. John.
|
13th Feb 2013, 12:01 am | #120 |
Hexode
Join Date: Nov 2009
Location: Chertsey, Surrey, UK.
Posts: 456
|
Re: My Bush TV43 restoration.
I was careful to made a diagram of the old wiring before replacing it, the new wire was listed with a 3 amp rating, I did try to pull the EHT connecter out, but its firmly stuck I will get some wd40 to try on it. and I am cautious around CRTs as they can implode and this one would be very hard to replace
|