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Vintage Television and Video Vintage television and video equipment, programmes, VCRs etc. |
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18th May 2014, 10:03 am | #21 |
Octode
Join Date: Jan 2006
Location: Borough of Gateshead, UK.
Posts: 1,420
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Re: Ferguson 546T "Flight" 17" Portable
Cheers David, having found one I'll be replacing it later today. I note it's been replaced many years ago with a type known to cause trouble. Some valves in the set are "THORN" branded ones, including one of the EF80s, suggesting service into the '70s.
Many thanks also to John for your comments, this narrows down the search for a replacement CRT. I was tempted to fit a buzzer device around the CRT neck on a push to make basis! I had a similar problem with an AW47-91 many years ago. The cabinet is going to be the biggest challenge as space is very restricted, the sound output PCL82 often gets knocked out of posistion on removing or re-inserting the chassis into the cabinet. It needs to be strengthened from the interior with ventilation holes cut out once set. Any thoughts? Cheers, Brian |
18th May 2014, 9:11 pm | #22 |
Octode
Join Date: Jan 2006
Location: Borough of Gateshead, UK.
Posts: 1,420
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Re: Ferguson 546T "Flight" 17" Portable
Further work this evening. The chief suspect for the non linearity C96 (100mfd) was replaced. This made a big difference, the linearity was worse than ever!
Just to be sure a new PCL82 frame osc/output valve was tried, no difference. It just had to be resistors.... R125 (100K) feed to the linearity control was within tolerance, yet edging upwards in value. R127 (270K) was high at 340K. R121 from the height control had more than doubled in value from the correct 330K. Replacing these then carrying out adjustments sorted matters out in the frame department. Lack of width remains however, the boost volts are near correct and the width control set to maximum. I'll look into this next time as it started to get dark. Had the set running for a good hour with everything working well, allowing for the slight lack of width. The photos also show the inside of the cabinet, note the Duck tape is temporary! The gold effect around the cabinet and on the fine tuner knob should respond to re-spraying. Cheers, Brian Last edited by Focus Diode; 18th May 2014 at 9:22 pm. |
19th May 2014, 8:56 am | #23 |
Dekatron
Join Date: Jun 2005
Location: Warnham, West Sussex. 10 miles south of DORKING.
Posts: 9,147
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Re: Ferguson 546T "Flight" 17" Portable
Check that the linearity sleeve has not been pushed into the scanning coils too far. It only needs to be a small amount to have quite a dramatic effect. John. []Looks good! They perform very well and once sorted, reliable.]
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20th May 2014, 2:00 pm | #24 |
Heptode
Join Date: Nov 2008
Location: North Walsham, Norfolk, UK.
Posts: 900
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Re: Ferguson 546T "Flight" 17" Portable
Just found a couple of PCC89's. If you still want one send me a PM
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20th May 2014, 10:01 pm | #25 |
Octode
Join Date: Jan 2006
Location: Borough of Gateshead, UK.
Posts: 1,420
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Re: Ferguson 546T "Flight" 17" Portable
Cheers Nigel, I'll send you a PM shortly.
The linearity sleeve is a strong possibility John, I also have to replace C70 which was delayed having no 0.22mfd capacitors. I'll sort it tomorrow hopefully. Cheers, Brian |
22nd May 2014, 8:20 pm | #26 |
Octode
Join Date: Jan 2006
Location: Borough of Gateshead, UK.
Posts: 1,420
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Re: Ferguson 546T "Flight" 17" Portable
Another session this evening. A 0.35mfd capacitor was fitted in the C70 posistion so I thought a 0.47mfd would be OK. There was also a 0.5mfd wax capacitor hiding on the LOPT so this was also replaced.
The width is now a lot better. The linearity sleeve is missing from the set! Still some issues to deal with but it's starting to look good. Cheers, Brian |
29th May 2014, 11:16 am | #27 |
Nonode
Join Date: May 2006
Location: St Albans, Herts, UK.
Posts: 2,193
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Re: Ferguson 546T "Flight" 17" Portable
Very good line lin considering there's no sleeve, Brian. Nice set. I have the "normal" 506 version.
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All the very best, Tas |
5th Jun 2014, 9:20 am | #28 |
Octode
Join Date: Jan 2006
Location: Borough of Gateshead, UK.
Posts: 1,420
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Re: Ferguson 546T "Flight" 17" Portable
Thanks Tas, I think I may need to get out the spirit level as the whole image appears a little slanted to the right. A touch of the scan coils is probably all that's needed.
I remember reading a "Your Problems Solved" concerning a BRC 900 or 950 set fitted with a replacement Mullard CRT. The owner was unable to re-fit the linearity sleeve having found the neck slightly thicker than on the original Mazda CRT. The advice given was it can be safely omitted as, "The linearity will be acceptable without it". Getting back to the 546T, when time permits work on the cabinet will commence. I'll be providing an update when works starts. Incidentally the set came with a protective cover, I don't think it's original, possibly being made especially for the set! Cheers, Brian Last edited by Focus Diode; 5th Jun 2014 at 9:30 am. |
5th Jun 2014, 2:27 pm | #29 |
Dekatron
Join Date: Jun 2005
Location: Warnham, West Sussex. 10 miles south of DORKING.
Posts: 9,147
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Re: Ferguson 546T "Flight" 17" Portable
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