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Old 30th Sep 2018, 11:36 pm   #21
FERNSEH
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Default Re: A pair of Rediffusion monos....

Colourstar wrote:
"I don't have a VHF 625 source but if anyone has an ELC1043 from a scrap set I'd be very interested!"
Hi Steve,
I'm sure to have a spare ELC1043 or the Thorn equivalent, the SC4.

DFWB.
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Old 1st Oct 2018, 10:06 am   #22
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Default Re: A pair of Rediffusion monos....

Beggars can't be choosers but the Thorn SC4 is much more reliable than the ELC1043, they suffered all sorts of intermittent problems. Philips didn't even use them in the G8 or G9 while it was fitted to almost every other UK produced set at the time with the exception of RBM.

Sorry I can't help you out but if fitting an ELC it will need to be the /05 type, there was some differences in the IF output with the /06 version.

John.
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Old 1st Oct 2018, 10:11 am   #23
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Default Re: A pair of Rediffusion monos....

More information about the tuners in the Mark 13 receiver.
It should be possible to tune in UHF channels with the existing ELC1042 tuner.

DFWB.
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Old 1st Oct 2018, 11:20 am   #24
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Default Re: A pair of Rediffusion monos....

Sorry Fernseh but the ELC1042 is definitely VHF only, see Pieter Hooijmans excellent website here https://www.maximus-randd.com/tv-tun...3.html#elc2000.

The company where I started work in Sunderland used to buy ex rental sets from J.L. Morley down in the Tyne valley and lots of these had been converted with the ELC1042 for use with VHF communal signals, conversion back to UHF with an ELC1043 was simple. Even RBM produced a VHF varicap tuner of there own design and there was also a VHF version of their 4 button mechanical tuner used in the A774 and A823 sets.

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Old 1st Oct 2018, 11:33 am   #25
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Default Re: A pair of Rediffusion monos....

Quote:
Originally Posted by FERNSEH View Post
More information about the tuners in the Mark 13 receiver.
It should be possible to tune in UHF channels with the existing ELC1042 tuner.

DFWB.
No - first sentence of data sheet - 'Check that the correct tuner assembly is fitted .........'

ELC1042 = VHF, ELC1043 = UHF

It appears that channel selector has provision for VHF or UHF or indeed both
if two tuners were fitted but ELC1042 will certainly not tune UHF - any reception is provided by harmonic of local osc - with no RF tuning this accounts for phenomenon described

Hope this clarified

Rgds to all

J
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Old 1st Oct 2018, 11:59 am   #26
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Default Re: A pair of Rediffusion monos....

OK, I stand corrected, but it's no problem because I will be visiting Steve on Saturday so I will take an ECL1043 or it's equivalent with me.

DFWB.
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Old 1st Oct 2018, 12:11 pm   #27
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Default Re: A pair of Rediffusion monos....

You will still require those instructions with a new tuner to change the band switching, or am I reading the instructions incorrectly?
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Old 1st Oct 2018, 12:23 pm   #28
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Default Re: A pair of Rediffusion monos....

Hi Frank, the way I read it is to just fit the correct tuner and set the bandswitching to UHF.

John.
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Old 1st Oct 2018, 12:53 pm   #29
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Default Re: A pair of Rediffusion monos....

With a UHF tuner fitted the bandswitching pin (or rather lack of pin) will be unconnected so position of band switch is irrelevant

J
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Old 1st Oct 2018, 2:40 pm   #30
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Default Re: A pair of Rediffusion monos....

Pin out for the ELC104x tuners. As kan_turk says the bandswitch pin is not fitted to the UHF ELC1043 so the setting of the front control panel is irrelevant.

John.
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Old 1st Oct 2018, 3:38 pm   #31
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Default Re: A pair of Rediffusion monos....

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Old 1st Oct 2018, 4:19 pm   #32
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Default Re: A pair of Rediffusion monos....

Quote:
Originally Posted by jayceebee View Post
The company where I started work in Sunderland used to buy ex rental sets from J.L. Morley down in the Tyne valley .
Morley's, now there is a real blast from the past
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Old 1st Oct 2018, 5:21 pm   #33
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Default Re: A pair of Rediffusion monos....

Red to black wrote: "Morley's, now there is a real blast from the past"

Closed in 1991. I've still got the display stands from the Crawcrook shop.
Talking to the boss, He said: "there going to be carnage in these trade" He was right. Think of all the TV shops that closed down in that decade!

DFWB.
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Old 4th Oct 2018, 12:08 pm   #34
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Default Re: A pair of Rediffusion monos....

Quote:
Originally Posted by Colourstar View Post
Especially for Tim, a photo of the timebase panel. The middle and right hand presets control height and linearity. Plenty of 'tropical fish' caps but no PCL85!
Well it would have been a toss-up between those dodgy looking presets and the lockfits then wouldn't it? She was in a basement flat and it was always pretty damp, so I'll go for the latter. Interesting though, I wonder what the thinking was behind it? I'm guessing that there's a frame output transformer elsewhere on the chassis as there's only one 'big' transistor visible.
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Old 4th Oct 2018, 7:56 pm   #35
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Default Re: A pair of Rediffusion monos....

Quote:
Originally Posted by Studio263 View Post
I'm guessing that there's a frame output transformer elsewhere on the chassis as there's only one 'big' transistor visible.
That indeed seems to be the case.

I'm finding date codes on several electrolytics and on the main can with dates such as '77-41' and '77-11'. It also has '15/4/78' scrawled inside the back cover. Surely these sets are older than that. Or are they?

Oh and guess what I spotted when I removed the chassis.....
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Old 4th Oct 2018, 8:53 pm   #36
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Default Re: A pair of Rediffusion monos....

Hi Steve,
You can change that label to "UHF" on Saturday, I've found an ELC1043/05 for the set.

DFWB.
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Old 4th Oct 2018, 10:47 pm   #37
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Default Re: A pair of Rediffusion monos....

Don't forget that Rediffusion had a policy of renovating sets, which would probably also account for your replacement tube. They did a thorough job as well - witness the Mk1 colour chassis that lived on for many years as a decontrolled set, that looked to the average punter just like the Mk3.
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Old 11th Oct 2018, 3:24 pm   #38
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Default Re: A pair of Rediffusion monos....

Hi, apologies for late reply, have been a bit busy.

First thanks for the clear picture with the label, although unfortunately it is partly covered by a quality check sticker.
I saw you all having a lot of - confused - tuner discussions. Fortunately JayCeeBee already referred to my site, where the ELC2000 family is discussed in detail.
A few remarks, also answering some of the questions raised in earlier posts:
  • the ELC2000/1042/1043 was clearly not Philips best tuner, which was the result of the temporary split of the tuner business between the TV and Components groups. The ELC was the first of the Components group and not well engineered, especially with respect to the soldering of frame, ground etcetera.
  • As a consequence it was not used in Philips colour TV sets, only B&W and VCR (where the latter is strange, since a VCR was more expensive than a CTV).
  • The ELC1042 and 43 were almost exclusively sold to third party (non-Philips) UK customers.
  • Depending on the price point and function of the sets, I've seen ELC1042-only (VHF), ELC1043-only (UHF) and ELC1042+43 parallel (VHF&UHF). The Rediffusion set shown here is clearly a VHF set (where indeed as far as I know Rediffusion was mainly VHF-only) although w.r.t. the push-buttons prepared for UHF too.
  • As to dating the set: the ELC1042/43 were introduced in 1972 with the 12nc 2422-542-10420. Later versions had codes ending with 10720 and 10721. Since the tuner in the picture has the last code, this suggests it was probably from later than 1975/76, because these codes were not easily changed, usually at least with 2 year in between. This fits fairly well with the date 1977 of the other components.

Cheers, Pieter
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Old 11th Oct 2018, 7:13 pm   #39
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Default Re: A pair of Rediffusion monos....

Thanks for the info, Pieter. Very interesting.

It does seem then that 1977/8 could well be the production date for this set, which raises the question as to whether this was the last UK produced monochrome chassis to contain valves, albeit only two of 'em.

Unfortunately family circumstances on my part prevented David's trip to see me, so there was no tuner swap, for now at least.

Steve
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Old 11th Oct 2018, 8:15 pm   #40
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Default Re: A pair of Rediffusion monos....

Quote:
Originally Posted by Colourstar View Post
It does seem then that 1977/8 could well be the production date for this set, which raises the question as to whether this was the last UK produced monochrome chassis to contain valves, albeit only two of 'em.
Hi Steve,
The Thorn 1500 runs neck and neck with the Rediffusion!
My one has date codes on some caps from the middle of '77. See also this post from John about the last ones he sold.

https://www.vintage-radio.net/forum/...4&postcount=14

Have you looked closely to see if there are any date codes on your caps?

Amazing that in 1977, they were still making a set with 5 valves in!! Mind you they probably achieved better reliability than sets with transistor LOP stage.

Cheers
Nick
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