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Old 25th Oct 2022, 6:47 pm   #1
Electricdreams
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Default Dynatron can you identify this set?

Just got this set, no rear cover.. can you identify it?
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Old 25th Oct 2022, 8:26 pm   #2
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Default Re: Dynatron can you identify this set?

I believe it will have the same insides as the dual standard Ekco TC435

Chris
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Old 25th Oct 2022, 9:28 pm   #3
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Default Re: Dynatron can you identify this set?

Agree Chris. Almost certainly another version of the PYE 11U series. A back view would prove it. J.
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Old 25th Oct 2022, 9:36 pm   #4
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Default Re: Dynatron can you identify this set?

It probably does use the first common Pye / Ekco dual standard all valve chassis, looks like this from the rear.

It was likely made in the Ekco factory and may have a model number stamped in blue-ish ink on the chassis somewhere, like TV73.
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Old 26th Oct 2022, 6:30 am   #5
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Default Re: Dynatron can you identify this set?

Thank you guys, the clue about having a pye chassis enabled me to find out on here that its a Dynatron Knightbridge TV70. I also found a brochure that someone posted on here…
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Old 26th Oct 2022, 9:27 am   #6
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Default Re: Dynatron can you identify this set?

This will be a very recognizable chassis to service guys of the 1960's. They were very predictable and gave a good picture on 405. UHF performance was a bit low due to the low gain HOPT tuner but cleaned up with a good aerial.

The mains dropper was a very common failure together with the 270k later changed to 680k preset contrast control erupting in flames! L28 the FM sound oscillator coil used to spring loose but a half turn on the core put things right. The UHF drive cord was the worst of all time ending up in a tangled nightmare. This was later replaced by a simple mechanical one. They must have been produced in hundreds of thousands under many brand names of the PYE group including special cabinet series for the rental companies. There were many types of VHF/UHF tuners. Landfill must be full of them! I presume you are going to restore it? John.
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Old 26th Oct 2022, 9:44 am   #7
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Default Re: Dynatron can you identify this set?

Yes indeed, produced in very large numbers in the Pye and Ekco factories and one of my favourite 1960s dual standard all valve chassis (I agree with John that the UHF tuners were rather "deaf", but so were all valve UHF tuners used by the other UK manufacturers - compared to the later transistor versions).
Certainly one of the best chassis for good and easy access for repairs.
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Old 26th Oct 2022, 9:47 am   #8
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Default Re: Dynatron can you identify this set?

Yes indeed, produced in very large numbers in the Pye and Ekco factories and one of my favourite 1960s dual standard all valve chassis (I agree with John that the UHF tuners were rather "deaf", but so were all valve UHF tuners used by the other UK manufacturers - compared to the later transistor versions).

Certainly one of the best chassis for good and easy access for repairs.

If you're planning on restoring the set, be very careful with the pitch dipped line output transformer. It will need drying out first (there are threads on the forum about this) before powering up, or it will likely get very hot and possibly fail completely.
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Old 26th Oct 2022, 10:07 am   #9
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Default Re: Dynatron can you identify this set?

Yes as Daz has explained. Take care of the LOPT before applying power by way of passing current through the overwind for about 8 hours, 60-80 m/a. Ignore the actual appearance. They always looked like a dogs dinner with soft tar and rivulets of wax from caps even when new, it does not effect their goodness.
I only replaced a couple of LOPTS in service so you have a good chance it will be OK. John.
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Old 26th Oct 2022, 10:20 am   #10
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Default Re: Dynatron can you identify this set?

Hi both!

Well this was thrown into the skip, it was rescued by a recycling hub and that's how I come to acquire it.
Do you want to see the back John? Might give you a bit of a heart attack.. speaker was found to be on the wrong side of the cabinet, the tuning plug was unplugged and PCL84 has been smashed (V14) and the CRT neck unplugged...

Nobody will want this!

The contrast resistor is broken.. I'm not sure what the CRT will be like, hope it's not weak!

It's a bit of a big job but I like that!

Fortunately this set only uses push buttons instead of drive cords so it should be okay. (They are seized up)

If it's too much for me to handle. I can give it to anyone here to use as parts....

Hi Dazzle,
Shall I just remove the LOPT and put it in the airing cupboard, would that work?

Paul

I'm on my week off and already I'm buying more junk!
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Old 26th Oct 2022, 11:58 am   #11
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Default Re: Dynatron can you identify this set?

So it really is a all show and no knickers!
All easy to carry out but if the CRT is damaged, this may be a problem due to good 19" tubes getting a bit rare. A challenge is a challenge. It all depends if you fancy having a go.
Do you mean the CRT neck is broken or just the connector disconnected? The airing cupboard method is OK but it will take at least 3 months to dry out. A back picture might give it more hope. John.
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Old 26th Oct 2022, 12:20 pm   #12
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Default Re: Dynatron can you identify this set?

Hi John,

Here’s a photo of the back.. I’m picking it up Friday (I hope) so will send more. I did open the board up but didn't take some photos..

Anyone got a back cover for it?

Paul
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Old 26th Oct 2022, 12:34 pm   #13
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Default Re: Dynatron can you identify this set?

From previous posts, a bread and butter TV in the 1960’s early 70’s. The earlier version of the chassis had 1 preset contrast pot and a PCF80 for second IF, a later version had separate 405/625 preset contrast pots and a EF184 for the second vision IF. It made a big difference but the valve UHF tuner still had its high noise factor problem. A decent signal on UHF gave really excellent pictures on the later chassis.

It’s not easy to see from the photo but it doesn’t appear to have the flywheel line sync unit, so direct sync, as long as the signal is clean the direct sync works very well.
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Old 26th Oct 2022, 12:55 pm   #14
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Default Re: Dynatron can you identify this set?

After enlarging the chassis photo, I think I can see the three screws that secure the small flywheel sync board (there should be an ECC82 on it).

As for drying out the LOPT, if you have the wherewithal to pass dc current through the windings, John's approach will be quicker and likely more effective - heat from within.
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Old 26th Oct 2022, 1:24 pm   #15
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Default Re: Dynatron can you identify this set?

Well it looks bashed about a bit but that is easily rectified.
Late versions of the PYE 11U have a transistor UHF tuner and yes the later EF184 version made a lot of difference gain wise. [The Philips tuner with the plastic back was without doubt the valve UHF tuner with the highest gain and would have made the 11U's UHF performance good but was not available at that time to PYE.]
The Dulwich museum has a late version with the stereogram incorporated known as the Trio model 28. I call it the Diana Dors version. The generous printed circuit board is easy to worth with.
The back cover is probably still in the skip, shame, John.
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Old 26th Oct 2022, 3:02 pm   #16
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Default Re: Dynatron can you identify this set?

I didn’t see any with a transistor UHF tuner and I agree the Philips tuner was probably the best of the valve UHF versions.
I think it was the high noise of those other valve tuners that was more of a problem, how Philips managed to make a much better job with the same valves I don’t know.

Ok on the flywheel sync panel.
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Old 26th Oct 2022, 3:52 pm   #17
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Default Re: Dynatron can you identify this set?

Quote:
Originally Posted by Nuvistor View Post
I didn’t see any with a transistor UHF tuner and I agree the Philips tuner was probably the best of the valve UHF versions.
I think it was the high noise of those other valve tuners that was more of a problem, how Philips managed to make a much better job with the same valves I don’t know.
I'd agree that there were very few "Pye 11U" chassis sets factory fitted with a transistor tuner. I have pretty well all of the issued Pye and Ekco service manuals and supplementary sheets for the 11U chassis models and the only one supplement that mentions a transistor tuner was for the one for the very last Ekco and Ferranti sets (published in 1964).

I'm sure that the Pye/Ekco service company RTS produced a transistor version of retrofitting UHF tuners in sets that weren't fitted with them in the factory.
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Old 27th Oct 2022, 9:53 am   #18
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Default Re: Dynatron can you identify this set?

Might this photo help to see if the set has flywheel sync?

Where is it supposed to be located?
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Old 27th Oct 2022, 10:19 am   #19
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Default Re: Dynatron can you identify this set?

Yes, it has the small flywheel sync board fitted. You can see the gassy ECC82 valve.
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Old 28th Oct 2022, 11:43 am   #20
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Default Re: Dynatron can you identify this set?

Here you go, more pics..

I should check if the tube is okay first..
Gonna take the LOPT out and the tuner as well, clean up the tuner while the lopt dries out.

The on board pots arent great..

Does anyone know where this plug goes? I think it should go to the tuner..?

It does look like it has been repaired a few times in the past.. that blue philips cap screams 80s to me…
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