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Forum 141

B&W TV Pye 4378

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Michael Dranfield
(@michael-dranfield)
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Hi everyone, I have just picked up a Pye 4378/HM model mono TV, now the last time I repaired a Pye monochrome must have been 1982 ish and I seem to remember it was a 691 chassis,, can anyone tell me  the the chassis for the 4378HM as I remember the 691 chassis had a dropper with not many sections and this set only has two sections but the 4378 model does not seem to appear in the radio tv servicing books so I need to identify the chassis so I can look through my service manuals, many thanks in advance. 

 
Posted : 31/05/2024 6:31 pm
crustytv
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Hi Michael, the 691 was single std hybrid colour.

I'll look on my library for the 4378 and if I find it het back to you. 👍 

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Posted : 31/05/2024 7:02 pm
crustytv
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Well, I've looked in my ERT index, Trader index and like you radio & television servicing  plus through my pye cabinet... Nothing!

How about a photo of the set and chassis, I'm sure from that we can tell you fairly quickly. I will ask my mate, another Chris, he is probably the foremost authority on all things Pye, his collection of Pye TVs is vast, he pretty much has everything and runs the Pye group on Facebook.

Radio museum suggests it dates to 1970/1971 hybrid and uses the same chassis as the 4513 and 4451, neither of those appear to exist either. RM offer nothing and no reference or proof which is pretty damn useless.

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Posted : 31/05/2024 7:31 pm
slidertogrid
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I think the 569 and 169 were the Pye single standard chassis' Early ones had a mechanical tuner and the later ones varicap. They had a two section 'dropper'.  They were the last hybrid model Pye made. 

 
Posted : 31/05/2024 7:46 pm
Michael Dranfield
(@michael-dranfield)
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@crustytv of course my typing error, it should have said 169.

 
Posted : 31/05/2024 8:31 pm
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Michael Dranfield
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@slidertogrid mine has electronic tuning and hybrid, I can see at a quick glance 2 ic s, I will see if I can upload a photo soon, the set has a little woodworm so currently wrapped in some clingfilm.

 
Posted : 31/05/2024 8:37 pm
Michael Dranfield
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@crustytv see if I can upload a photo in the next few days, I could be sitting on a rare set then if there are no references to it, atcually I'm wondering if it says Cambridge on the front of the set and pye on the back,i collected this in a bit of a rush so didn't take too much notice!

 
Posted : 31/05/2024 8:42 pm
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crustytv
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I've found three manuals, one of which I thought might be the TV in question, based on the clues thus far. The chassis' are as follows :-

  1. 169 (year 1970)
  2. 173 (year 1973)
  3. 184 -chassis type 176 (year 1976)
  4. 569 (year 1970)
  5. 573 (year 1973)
  6. 769 (year 1970)

 

It would really help if the IC's could be identified, for example the '184' has a TBA750BQ, TBA720AQ, TBA890.

20240601 070352

p.s.

@michael-dranfield Michael, if you're not confident on how to add a photo, just e-mail it to me and I will add it to the thread for you, another member does exactly this, and I'm more than happy to help.

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Posted : 01/06/2024 6:08 am
sideband
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From my 'raw' data that I downloaded from Philips before we got the boot, this is an export set. '4378 PYE, FEB 72. 24' MONO TV EXPORT' Can't help with the chassis I'm afraid but it could be an 'E2' (Euro 2). Does it have a thick film unit on a heatsink along the top of the chassis? Unless it's been modified, there's a good chance it will have 5.5Mhz sound I.F

 

Both of those other numbers that Chris mentions on RM show exactly the same info except for screen size. Actually on second thoughts, it might be too early for an E2 chassis which was wholly solid state.

 

We need a photo Mike!!

 
Posted : 01/06/2024 7:03 am
crustytv
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I thought the model numbering on Michael's TV was odd, all my PYE service data does not conform to that. However, in our PYE B&W brochure on the main website, the very first PYE there is a 4311. By the look of the couple's attire, it looks more late 60s than 70s.

Forum 142

Forum 143

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Posted : 01/06/2024 7:38 am
Michael Dranfield
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OK, I managed to get a photo of the front, it's on the floor at the moment as I'm struggling to find a space on the bench to put it, and as I thought the confusion seems to be the badge on the front says Cambridge but it says pye and the model on the back

IMG 20240601 090613
IMG 20240601 091300
 
Posted : 01/06/2024 8:24 am
crustytv
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A picture with the back off showing the chassis is what we really need. The photo should be taken from enough distance, to show the entire chassis, that will likely reveal to us the chassis type. 👍 

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Posted : 01/06/2024 8:42 am
Jayceebee
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Don’t Remember a PYE with that styling, looks that it may have been destined for export but released on the home market. The HM in the model number screams this to me. 

John.

 
Posted : 01/06/2024 9:14 am
jcdaze
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I've found a newspaper advertisement showing that Comet were selling a PYE 24" black and white television with the model number 4378 for the special price of £99.99 in 1975.

 
Posted : 01/06/2024 11:41 am
Cathovisor reacted
slidertogrid
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Maybe Comet did deal with PYE for a quantity of sets? It may explain why it was badged "Cambridge" on the front. Or maybe they bought up a quantity of sets that were produced for export but didn't go for some reason? Discount places often bought a 'production line' of sets or domestic appliances, often with a special model number for themselves.  When I was looking for a washing machine many years ago I found that Currys had the same machine as John Lewis but each machine despite being identical had different model numbers. This of course meant that they didn't have to price match each other as it was a different model.  

This Pye is a bit late to be a hybrid I think... Is it a solid state chassis?

 
Posted : 01/06/2024 1:45 pm
Michael Dranfield
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Many thanks for all the replies, and yes it is a valve hybrid, I will repost photos at a later date, I'm not in any rush I was just lining this set up for a YouTube video but have a little bit of a space problem at the moment. 

 
Posted : 01/06/2024 6:33 pm
slidertogrid reacted
Cathovisor
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@slidertogrid Plenty of hybrid sets still around in 1975, Rich - both mono and colour.

 
Posted : 01/06/2024 6:37 pm
slidertogrid
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@cathovisor Yes you are right. I went into the trade in 1977, most of the mono sets I saw were very early single standard models, Pye 169/569, KB Vc200 and of course loads of Thorn 1500s.  The firm I worked for were keeping the older mono sets going so I didn't see many mid 70's mono models apart from a few of the Philips Solid state sets . Certainly the numbers of new Mono sets were falling in favour of colour sets.

I have a PYE 169 in my collection saved kerbside from the bin men!  

 
Posted : 01/06/2024 7:32 pm
Cathovisor
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@slidertogrid I'd like to find a nice example of the 24" Pye I had as a teenager - teak cabinet, 368 chassis, six-button tuner: but a set I'd really like to find is an RGD 519, a 19" 405-only set with a two-PCB layout.

 
Posted : 01/06/2024 10:12 pm
irob2345
(@irob2345)
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Pye in Oz produced their last hybrid (T23 chassis) in 1968. Pye in NZ had a completely different hybrid (using Compactrons!) in production for much longer.

Starting with the late T21s, Pye used to offer 4 years free service with their TVs. The rest of the industry hated them for it, but the TVs were reliable.

I'd like to pick up a T26 chassis Pedigree, the unloved squared-off 24" model. The 23" Pedigree was Pye Australia's answer to the Philco Predicta.

 
Posted : 01/06/2024 10:37 pm
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