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Project 1970s Rediffusion Reditune TP80

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crustytv
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What is that saying about buses....... Oh, and the other one about a certain earthy law!

A 1976 Reditune TP80 player only went and turned up on eBay, well I had to have it, sadly no cartridges with it though.

This is where that earthy law kicks in, last week, Jim tipped me off to a Reditune cart that he thought might fit SIS2 player. It was on eBay but located in Japan, I looked and confirmed it was not compatible. It was for the Reditune TP.80 machine, which of course I didn't have........but I do now! Aghhhhhh

Of course, the listing ended without sale but has not been relisted and I cannot find the vendor.

The pain, oh the pain..... 🤣 

Here's the TP80 I bought, anyone got some fairy dust, rocking horse poop, unicorn hair or a TP80 cart?

tps80
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Topic starter Posted : 25/11/2021 11:18 am
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crustytv
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To bring this thread up to date, not only did I managed to find a rare Reditune player, which I'd not shown any pictures of yet, but mid-December, I also managed to track down two Reditune carts, from Japan.

Thankfully, the chap in Japan was very helpful, as up until recently I was having a devil of a job figuring out the right carts for the player. They were not cheap, especially due to shipping, but there we go, needs must and all that. I also have a potential option on more carts, so watch this space. The carts are huge 8" x 6¾".

Now all I have to do is schedule time in-between working on the 4K's, so I can open up the Reditune player to see what, if anything, requires doing to it. With any luck, in the not too distant future, background music coming to the CrustyTV museum shortly. Flares and round colour shirts will be mandatory attire. 😉 

 

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Topic starter Posted : 23/01/2022 11:31 am
crustytv
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OK, I admit to being a total numpty with this, so how do I connect a speaker and what type, can anyone help?

I don't like the look of the block up top, they look to be putting out 50V & 100V with a centre point marked as CT The three DIN sockets would appear to be inputs. That leaves sweet FA for a speaker. Does this require some special speaker that requires 50V or 100V!!

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Topic starter Posted : 23/01/2022 1:38 pm
RichardFromMarple
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@crustytv Very interesting, I wonder how they ended up in Japan.

 

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Posted : 23/01/2022 1:38 pm
Nuvistor
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@crustytv 
introduction to 100v line speaker systems.

https://www.redbackaudio.com.au/understanding-100v-line-distributed-speaker-systems/

 

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Posted : 23/01/2022 1:45 pm
crustytv
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Posted by: @richardfrommarple

I wonder how they ended up in Japan

Not that surprising really, Rediffusion Reditune was a Global offering and was popular all over the world, including Asia. Their biggest market being Europe, with over 20,000 offerings in their catalogue.

Music Library
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Topic starter Posted : 23/01/2022 1:46 pm
crustytv
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Posted by: @nuvistor

introduction to 100v line speaker systems.

OH Fiddle Sticks, so is there no way to connect up an ordinary speaker. I was hoping to use my Grundig HiFi Boxes. So I've now got to source a 100V or 50V line speaker.

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Topic starter Posted : 23/01/2022 1:50 pm
Nuvistor
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@crustytv 
there are 100 volt line speaker transformers available on eBay.

There was a good explanation in the Radio constructor magazine in the 1960’s. One of the workshop articles, it may be possible to use a standard speaker transformer but never having been involved with them I can’t be sure.

 

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Posted : 23/01/2022 2:07 pm
Nuvistor
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@crustytv 
Radio Constructor, August 1964, In You Workshop, it discusses hum in PA amps then goes on to 100 volt line working.

I don’t think the data library has RC so here is a link to World Radio History.

https://worldradiohistory.com/UK/Radio-Constructor/60s/RC-1964-08.pdf

 

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Posted : 23/01/2022 2:58 pm
Alex728
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Posted by: @nuvistor

@crustytv 
there are 100 volt line speaker transformers available on eBay.

There was a good explanation in the Radio constructor magazine in the 1960’s. One of the workshop articles, it may be possible to use a standard speaker transformer but never having been involved with them I can’t be sure.

 

There's a few 100V speaker transformers available from CPC as well, quite a selection and not too expensive...

https://cpc.farnell.com/search?st=100v%20transformer%20eagle

 

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Posted : 23/01/2022 4:36 pm
Jayceebee
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Looks like the TP80 was made in Jersey?

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Posted : 23/01/2022 4:49 pm
crustytv
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To help illustrate the sheer size of the Reditune cart.

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Topic starter Posted : 23/01/2022 5:10 pm
crustytv
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This afternoon I bought a 100V line ceiling speaker for just under a tenner, and 32ft of Adastra, Heavy-Duty 2-Core 100V Line, 15A double insulated Speaker Cable. Hopefully this will suffice until I decide what to do long term.

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The machine is extremely heavy, no surprise when you look inside, 3 transformers and a hefty motor. The belt is massive too.

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Topic starter Posted : 23/01/2022 6:27 pm
Cathovisor
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@crustytv How Dare You! was one of the first LPs I bought - the classic, original 10cc line-up.

I remember Adastra as being the rival to Eagle International back in the 70s.

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Posted : 23/01/2022 8:14 pm
Red_to_Black
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@crustytv, why are you buying heavy duty speaker cable? the whole reason in the first place for 100V line speakers was to allow much longer cable runs on much smaller CSA cable!

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Posted : 23/01/2022 10:11 pm
Red_to_Black
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If you look inside your speaker you will probably find it contains a small step down transformer, this was so higher voltage, lower current and as a by product  thus less voltage drop to suit much longer cable runs, ie. a higher impedance circuit than a typical 8 ohm speaker would need.

This is the same basic reasons why we step up the National Grid to much higher voltages for transmission purposes and use a transformer at the end to bring things back down.

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Posted : 23/01/2022 10:19 pm
crustytv
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Posted by: @red_to_black

why are you buying heavy duty speaker cable? the whole reason in the first place for 100V line speakers was to allow much longer cable runs on much smaller CSA cable!

It's quite simple, Baz, as I stated earlier today ....

Posted by: @crustytv Posted : 23/01/2022 12:38 pm

OK, I admit to being a total numpty with this

Besides, I didn't have any suitable cable length for speakers. No harm, OK it's over spec'd but will work and only cost me a fiver so not a bank breaker.

 

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Topic starter Posted : 23/01/2022 10:24 pm
Red_to_Black
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Not at all,

the typical point call annunciator "ceiling" 100V line speakers was so you could parallel a few of them up on extremely long thin (think normal speaker cable 0.75mm or less) and not suffer significant voltage drops, nor need to use long runs of heavy duty cable for cheapness, as you say it won't matter but in the interests of wider knowledge I thought you and others might like to be aware.

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Posted : 23/01/2022 10:34 pm
RichardFromMarple
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@crustytv I see, I knew Reduffusion had many operations around, the world, mostly in Commonwealth countries, but it's not surprising they also traded elsewhere.

 

@Cathovisor10cc's How Dare You! was recorded just down the road from me at Stockport's Strawberry Studios.

 

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Posted : 23/01/2022 11:39 pm
Cathovisor
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Posted by: @red_to_black

Not at all,

the typical point call annunciator "ceiling" 100V line speakers was so you could parallel a few of them up on extremely long thin (think normal speaker cable 0.75mm or less) and not suffer significant voltage drops, nor need to use long runs of heavy duty cable for cheapness, as you say it won't matter but in the interests of wider knowledge I thought you and others might like to be aware.

There's a parallel with some pre-war radio manufacturers here: do you take the extension speaker feed from the primary or the secondary of the output transformer? One will need heavy wire to avoid loss of volume whilst the other will need well-insulated wire and a transformer on the speaker. Cossor favoured this latter approach.

 

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Posted : 24/01/2022 12:09 am
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