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Thread: Something To Keep Me Busy!

  1. #1
    Join Date: Apr 2012

    Location: N E Kent

    Posts: 51,624
    I'm Geoff.

    Default Something To Keep Me Busy!

    A little project.

    Just got a pair of early Celestion Ditton 15 speakers in pretty tidy condition (thanks Shane!).

    There is something wrong. I measured the DC resistance at the terminals and one gives a 6 ohm reading and the other 9 ohms. I'd guess the 9 ohm reading is correct and the 6 ohm speaker has problems. A capacitor I suspect, if the tweeter had fused the resistance would probably be even higher than the 9 ohms of the other. Unless of course the coil has shorted, which might account for the low reading.

    One little job done. A pair of modern terminal posts fitted instead of the horrible little bare wire terminals. The other speaker to do yet.

    Fortunately, I have spare tweeters and crossovers for these, so I should have them sorted out quickly!
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    It is impossible for anything digital to sound analogue, because it isn't analogue!

  2. #2
    Join Date: Nov 2011

    Location: Newcastle UK

    Posts: 3,745
    I'm Rich.

    Default

    Nice work. I paid a tenner for my pair from a local recycling place. They provide regular service in my second system and I love em dearly. I got round the binding post problem with some cheap spade connectors so I can use any cable. Strangely enough they like the budget Gale stuff from richers best.
    One of these days... I'm going to cut you into little pieces.

  3. #3
    Join Date: Apr 2012

    Location: N E Kent

    Posts: 51,624
    I'm Geoff.

    Default

    Some of the Gale branded cables are actually remarkably good.
    It is impossible for anything digital to sound analogue, because it isn't analogue!

  4. #4
    Join Date: Apr 2012

    Location: N E Kent

    Posts: 51,624
    I'm Geoff.

    Default

    Just found the problem.

    The tweeter on the speaker with the low resistance reading has a shorted coil, measuring 0.9 ohms instead of the usual 6 ohms DC you normally get on these. That explains the low 6 ohms at the terminals.

    I have a matched pair of good spare tweeters. I'll change both over. The crossover components will be checked and I may rewire everything anyway. I'll tidy and re-polish the cabinets and heat tighten the 'Tygan' grille cloth. They should end up as a very sound and tidy little pair of 'Classic' Celestions!
    It is impossible for anything digital to sound analogue, because it isn't analogue!

  5. #5
    Join Date: Nov 2010

    Location: Yorkshire

    Posts: 9,302
    I'm Andrew.

    Default

    I love my 15's to bit's, I have some 44's as well, must admit not used these as much as the 15's. They truly are worth digging out if you fancy a pair of classic speakers.
    SS
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  6. #6
    Join Date: Dec 2011

    Location: South downs

    Posts: 3,477
    I'm James.

    Default

    Always handy to keep old tweeters & crossovers, they will come in handy one day

    If replacing the xover caps best stick to BP lytics in the 15's IME

  7. #7
    Join Date: Apr 2012

    Location: N E Kent

    Posts: 51,624
    I'm Geoff.

    Default

    I'm not going to any extremes with these. They aren't worth a fortune, so any re-usable bits including capacitors will remain.

    I'm familiar with Ditton 15s, having had about five pairs and I reckon they'll be singing by the time I finish.

    Slightly tempted with the idea of using a super-tweeter. There's just enough room for a small tweeter next to the HF1300 and I have suitable drivers and a pair of 8 ohm 12db/oct 13kHz filters I made years go to work with a super-tweeter coming in above HF1300s. I wouldn't use the popular but horrible Coles/STC 3001g unit. A pair of tiny Eagle horns appeals, they were actually made by Coral and sound rather nice.
    It is impossible for anything digital to sound analogue, because it isn't analogue!

  8. #8
    Join Date: Apr 2012

    Location: N E Kent

    Posts: 51,624
    I'm Geoff.

    Default

    This is weird. I had differing DC resistance measurements from the tweeters measured at the crossover. I take them out of the speaker and they both measure OK. I swap the spare tweeters into the cabinets and find each speaker measures about 5.5 ohms at the terminals now, which I suppose is correct for a 4 to 8 ohm speaker. Where has the defect gone? It may have just been a bad soldered joint. I'm not complaining though. I still have to connect these and try them mind you.
    It is impossible for anything digital to sound analogue, because it isn't analogue!

  9. #9
    Join Date: Apr 2012

    Location: N E Kent

    Posts: 51,624
    I'm Geoff.

    Default

    Yup! All up and running and sounding good.

    Now as nice a pair of early Ditton 15s as you could wish to find. Never did figure out what the problem was, dodgy soldered joint is all I can think of.

    http://imgbox.com/gallery/edit/vK2y8...6UvtzbqNdbjzUP
    It is impossible for anything digital to sound analogue, because it isn't analogue!

  10. #10
    Join Date: Apr 2012

    Location: N E Kent

    Posts: 51,624
    I'm Geoff.

    Default

    Yup! All up and running and sounding good.

    Now as nice a pair of early Ditton 15s as you could wish to find. Never did figure out what the problem was, dodgy soldered joint is all I can think of.
    Attached Images Attached Images
    It is impossible for anything digital to sound analogue, because it isn't analogue!

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