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Old 25th Oct 2019, 6:38 pm   #21
Heatercathodeshort
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Default Re: 1971 Philips G6.

Some versions of the G8 had the Mullard[?] A67-120X tube fitted. I used to call it the 27" as they were not interchangeable.

I don't think this 67 centimetre tube was used in the G6 or was it? J.
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Old 25th Oct 2019, 8:16 pm   #22
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Default Re: 1971 Philips G6.

Hi John
The A67-120X was an imported tube either from the USA or Canada.
Was never fitted in the G6.

DFWB.
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Old 26th Oct 2019, 2:21 am   #23
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Default Re: 1971 Philips G6.

Possibly also made (under US or Japanese license) by one or more plants in Western and possibly Eastern Europe, but as far as I know never by Philips.

Philips did make 3 different tube sizes, though: A63-120X, A65-120X and A66-120X.
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Old 26th Oct 2019, 8:12 am   #24
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Default Re: 1971 Philips G6.

Quote:
Originally Posted by AJSmith625 View Post
Hello David, That was a blast from the past seeing a Mastercare service record card again. I wander which part of the country the set originated from. I don't recognise any names there. Excellent picture by the way.

Alan.
Like wise, I had forgotten service cards, as the set got a Currys stock control label
stuck on the back with a letter and number on it .
ie S15 would indicate that set was sold by currys in Stafford
W15 Would have Been wellington (now part of telford)
N7 Newcastle under Lyme
After the Dixion's take over and the opening of super stores branch, only had numbers and no stock control labels used
ie 216 was Dixion's in Shrewsbury
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Old 26th Oct 2019, 12:38 pm   #25
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Default Re: 1971 Philips G6.

That's interesting, Maarten. I came across a label for a Mullard A65-120X that must have fallen off a CRT many years ago, but I've no idea where it could have come from! That's the only one I've ever seen - what set could have used it? I've seen many A63 and A66 prefixes, plus a few A67s (used in Decca Bradfords among others) of course, but that was an odd one.
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Old 26th Oct 2019, 1:40 pm   #26
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Default Re: 1971 Philips G6.

I think the A65 tube was only made for a short while and then changed into the A66 tube.
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Old 26th Oct 2019, 8:43 pm   #27
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Default Re: 1971 Philips G6.

Hi,
This is my varnished top after one coat it looks better than the photo.

Gary.
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Old 26th Oct 2019, 9:57 pm   #28
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Default Re: 1971 Philips G6.

I had a Dynatron CTV7 a while back (Pye 691 in a posh frock!) and that had an A65 120X in it, the only time I've ever seen one.
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Old 26th Oct 2019, 10:11 pm   #29
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Default Re: 1971 Philips G6.

Was the A65-120X a fully square CRT like the A66-120X or did the shape of the faceplate resemble that of the Thorn-RCA A55-14X which had much more rounded corners compared with the Philips-Mullard A56-120X?

DFWB.
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Old 26th Oct 2019, 11:59 pm   #30
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Default Re: 1971 Philips G6.

One of the two K70 sets I had (now gone apart from keeping chassis for spares, tube got necked by accident..!) definitely had the A65-120X tube, I kept the label as proof! Looked pretty square to me. I also have a G8 with the A67-120X.

Nice to see one of the later G6 sets working, hope to see it in the "flesh" one day...
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Old 27th Oct 2019, 4:00 pm   #31
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Default Re: 1971 Philips G6.

For some reason I always found that the early dual standard 500 series were more reliable than the later models.It should have been the other way round!
On the single standard versions I had numerous burn ups with L5515[?] the desaturation choke mounted on the Mica board with the focus rect, EY51.
I used to run them with 560 volts boost or just enough to fill the width. I had a number that ran for 3 years without a service call.
Well they were colour TV! You just had to learn about them as you did the Thorn 2000, Decca CTV25, RBM CTV 25 and the lovely GEC. The list goes on. It was a long time ago. John.
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Old 27th Oct 2019, 9:50 pm   #32
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Default Re: 1971 Philips G6.

Quote:
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Was the A65-120X a fully square CRT like the A66-120X or did the shape of the faceplate resemble that of the Thorn-RCA A55-14X which had much more rounded corners compared with the Philips-Mullard A56-120X?
Fully squared off corners. I'll dig out a picture...
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Old 27th Oct 2019, 10:17 pm   #33
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Default Re: 1971 Philips G6.

Thanks Tas.
The last job we had to do to the set was find out why the sound output was so low and accompanied with intercarrier buzz.
The single standard G6 has a two stage 6Mhz amplifier employing BF194 lockfit transistors. Simple voltage measurement tests revealed that the first amplifier had no emitter volts, another faulty lockfit.
The transistor was replaced and the sound was restored to full volume and completely free from intercarrier buzz.

Regards,
Gary.
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Old 28th Oct 2019, 12:50 pm   #34
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Default Re: 1971 Philips G6.

I used to work for Granada TV in London, they had thousands of these beasts out on rent. Always seemed to be an after 6pm call!!!
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Old 28th Oct 2019, 1:11 pm   #35
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Default Re: 1971 Philips G6.

The early dual standards had a paxolin focus board which, being beside the line output valves, used to resemble toast after a few years. This was upgraded to a mica 'board' but as John says, this didn't help much. Many sets had a silicon focus rectifier fitted instead of the EY51 as they weren't the most plentiful valve in the Seventies, and all sorts of odd replacement resistors could be found in the focus ladder. That purple choke did give quite a few problems. The pictures on the duals did have the edge on the single standards IMHO, but these could still give much later sets a run for their money, and the picture breathing was, not unexpectedly, far better than on the G8.
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Old 28th Oct 2019, 6:28 pm   #36
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Default Re: 1971 Philips G6.

Sorry if this is a bit off topic but here are a couple of pics of the aforementioned Dynatron with the A65 120X tube also confirming that it is the squared off corner type the same as the A66 120X and A67 120X. It's the only CRT with this designation that I've seen. I can't remember who I gave this set to now after I'd got it going.
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Old 29th Oct 2019, 3:56 pm   #37
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Default Re: 1971 Philips G6.

Quote:
Originally Posted by Welsh Anorak View Post
That purple choke did give quite a few problems.
Later, Philips gave us one with a larger diameter, as the problem with these 'desat' chokes was due to the actual core, not the winding.

Another interesting fault was leakage on the PCB around the PCF300 bases.

As Glyn says, the dual standard G6 did give a slightly better picture.
If the field 'valve jockeys' didn't twiddle every preset on them, they were quite reliable.
I bought many ex-rental G6's, refurbished and sold them, and they gave little trouble.
Still nothing like the wonderful K70, though ...
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Old 29th Oct 2019, 5:59 pm   #38
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Default Re: 1971 Philips G6.

The Mazda 22" rounded corner A55-14X was only used in the Thorn 3000 due to the basic convergence circuitry employed in the 3000.
The square corner A56-120X appeared in the 3500 with it's much more sophisticated convergence board with pincushion correction transducer. J.
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Old 30th Oct 2019, 1:37 pm   #39
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Default Re: 1971 Philips G6.

My saturday job used to be going to the local second hand TV shop and going through and repairing the ex-rental 22" single standard G6s, as the shop owner was a salesman, not an engineer. Mind you, neither was his engineer!
I learnt about the 'rule of dust' there - if a chassis was thick with dust it was probabaly a changeover set with little or no faults. A suspiciously clean chassis usually meant it had spent more time in the workshop than with a customer.
I learnt some sharp business tricks there too. The shop sold to both the public and trade. One day a man came in and looked at a nice 511 on display. He said he was in the trade (which he clearly wasn't) and demanded a trade discount. A substantial amount was knocked off, and the man, smiling inwardly, almost ran to get his car. Once he was out of the shop I was summoned. 'Quick - give me a hand with this!'. The excellent G6 was hidden on the rack and an identical rogue set put in its place. As the man returned, the set was being switched off and wipled over, and we put it in his car.
Needless to say he was soon back threatening all sorts of legal action. 'But you're in the trade, sir, so you must know you buy it as you see it with no warranty!'
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Old 30th Oct 2019, 3:24 pm   #40
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Default Re: 1971 Philips G6.

We've had some interesting threads in the past (unfortunately before I joined) about buying & reconditioning ex-rental sets.

I remember someone mentioned it was important to learn which sets typically had.

So when picking them out at a wholesaler, a flash new looking set might be a lot more trouble than an old but reliable TV.

Also some rental companies had disposal codes that would give a clue as to what condition a set was in, though these often needed to taken with a pinch of salt.

Especially as some depots tended to off-load modular sets with a set of faulty boards & a tube on the way out!
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