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IMF owners thread!

Discussion in 'British Audio' started by canuckaudiog, Mar 18, 2013.

  1. Menno

    Menno New Member

    Messages:
    4
    >When I ordered the ALCAP set from Falcon Acoustics, however, it was missing two of the 4µF capacitors (see below).

    >I sent them an email about it, and they said that their capacitor list was for the domestic version of the crossover, and that I must have the export version. Nevertheless, they graciously sent me two more 4µF caps for free.[/QUOTE]

    Same thing here, but after contacting him he did sent me some 4µF capacitors as well :) Pretty cool!
    Now i have to find the time and patience to put all those caps in....

    Perhaps if someone else wants to order the capacitor replacement set for the TLS50II or ALS40, he'd better check out if he is in need of the 4µF capacitors or the 6µF capacitors - and contact the shop before ordering?
     

     

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  2. IMF_Pioneer

    IMF_Pioneer Active Member

    Messages:
    189
    Location:
    Australia
    Hi Menno,

    With some of the sets that Jerry offers he has already identified that there were variant produced during the lifespan of the production run, thus he normally will supply both values of a particular cap as he did with my RSPM Mk IV's. I have a couple of caps left over that that are of a different value to the original ones installed.
    For the small costing involved in the extra caps it saves a helluva lot of time and messing around waiting for the identical spec units to be sent.

    Unfortunately we all learn something new everyday I guess
     
  3. Andrew Chan

    Andrew Chan AK Subscriber Subscriber

    Messages:
    23
    Hi All

    Came across some TLS80 speakers recently and they had plastic laminate (wood coloured) instead of real wood veneer. I thought all the reference series speakers were wood veneered?
    They looked to be original IMFs as the owner had bought 2 sets from new at a well known Hifi store in Melbourne Australia many years ago. The speaker terminals were at the top of the speakers on the right instead of in the middle This gentleman stacked the two TLS80s on top of each other :yikes:.
    Did IMF have a budget series with laminates instead of the lovely wood veneer for a time there???
     
  4. IMF_Pioneer

    IMF_Pioneer Active Member

    Messages:
    189
    Location:
    Australia
    There were a few that were issued in "Laminex" finish but they were very early units. I've never seen any in the flesh though.
     
    Last edited: Jun 27, 2018
  5. Andrew Chan

    Andrew Chan AK Subscriber Subscriber

    Messages:
    23
    Makes sense they were early versions before coming out with wood venner. Do you think they were still made in England or maybe constructed here in Australia?
     
  6. Yvan_donald

    Yvan_donald Well-Known Member

    Messages:
    711
    Location:
    Montreal,Quebec,Canada
    Hi Andrew, the laminate IMF are the professionnal MKIII with the terminal on the top side ( 1×right,1×left).tls80 are all veneer.You have pictures of these speakers?
     
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  7. Yvan_donald

    Yvan_donald Well-Known Member

    Messages:
    711
    Location:
    Montreal,Quebec,Canada
    Hi,my old pair of professionnal have the terminals on the right (both), the other pair I got have the terminals on opposite side.
     
  8. Andrew Chan

    Andrew Chan AK Subscriber Subscriber

    Messages:
    23
    Hi Yvan. I don't have pics as they aren't mine and I don't anticipate I will see the owner any time soon. They were TLS80s as the owner bought them new. Do the Mklll have a metal plate on the bottom? These speakers did not. They had the two rectanglar/square vents with egg shell foam. Grey in colour. The super tweeters were at the top in the midline.
    Yes terminals were at the top on the left of standing in front of the speakers from memory.
     
  9. Yvan_donald

    Yvan_donald Well-Known Member

    Messages:
    711
    Location:
    Montreal,Quebec,Canada
    Hi, no Andrew no plate, but IMF used the formica on the early professionnal,some early Studio and Middle Import model and only the back was formica finish,I'M very sceptical about these Tls 80,they should be all wood veneer for the finish.Take pictures if you have a chance.
     
  10. IMF_Pioneer

    IMF_Pioneer Active Member

    Messages:
    189
    Location:
    Australia
    Hi Andrew,

    I to feel that no TLS-80's came out with Laminex surface treatment, I'm not sure that they ever used Formica as Yvan suggests, as Laminex was all the rage in the 1970's and Formica more so in the 1980's. It's only ever been the PM Mk III as Yvan suggests that were the Laminex examples.

    If these are genuine TLS-80's and finished in Laminex then they'll be the first ones I've heard of and also to be here in Australia would be an even bigger abnormality.
     
    Last edited: Jun 27, 2018
  11. Andrew Chan

    Andrew Chan AK Subscriber Subscriber

    Messages:
    23
    I will see if I can get some pictures. It will be asurprise for sure for the owner to discover they may be Professional monitor mkIIIs.
     

     

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  12. canuckaudiog

    canuckaudiog On a quest for high fidelity

    Messages:
    7,802
    Location:
    Edmonton, AB
    The easiest way to know is what colour is the front baffle? If it is black, it is the older Professional Monitor.
     
  13. Andrew Chan

    Andrew Chan AK Subscriber Subscriber

    Messages:
    23
    Hi all here are the speakers in question.
    IMF-pioneer, Yvan and canuckaudiog
    I think you are all on the money with it being professional monitor mkIIIs, black front baffle, and the filling looks like that hand woven honeycomb filters that are on the MkIIIs? Is that bass driver the older race track KEFs?
     

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  14. Yvan_donald

    Yvan_donald Well-Known Member

    Messages:
    711
    Location:
    Montreal,Quebec,Canada
    Hi,yes it is,so this guy bought two sets of MKIII, great!
     
  15. IMF_Pioneer

    IMF_Pioneer Active Member

    Messages:
    189
    Location:
    Australia
    Hi Andrew,

    The PM Mk. III's used the old style Yellow Bats type fibreglass insulation material and the Bass driver is the original KEF 25 watt B139. They would sound really good but it's that Bass driver that holds them back. One has to remember that back in the 1970's most gear around was only putting out around 10 to 15 watts thus speaker technology hadn't moved up the ranks of power handling in the mainstream music equipment market. It was starting to move upwards in the late 1970's though and became a bit of a spacerace between the manufacturers at the time, just look at the "Receiver Wars" era between Pioneer, Marantz and Sansui which ended up in the 300 watt RMS area.

    Amazing how quickly the technology escalated, as did the speakers to handle this massive increase in power output.

    It was basically my tally wacker is bigger than your tally wacker.

    Enjoy the ride !!!
     
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  16. IMF_Pioneer

    IMF_Pioneer Active Member

    Messages:
    189
    Location:
    Australia
    One thing about Laminex over real timber is that the Laminex will resist abrasion marks while real timber will bruise and is easily damaged, but for me real timber is what it's all about unless you are a 1970's retro fan. Gotta love those Kitchens that were full of laminex bench tops in the 1960's and 70's.
     

     

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  17. Andrew Chan

    Andrew Chan AK Subscriber Subscriber

    Messages:
    23
    So those B139s that are available now at Falcon acoustics could be a drop in replacement but with greater wattage. Would think the crossovers would have to be modified to fit those new drivers?
     
  18. mech986

    mech986 Text ↓ optional Posts:>18,000 Subscriber

    Messages:
    19,276
    Location:
    La Habra, California, USA
    Hi Andrew,

    Unfortunately, the newer KEF B139 SP1044 has a different sized chassis frame compared to the early original oval framed B139. The mounting holes do not line up at all, although I hung an SP1044 on one of my Professional Monitor III that was missing it's woofer and even poorly fitting and sealed, it sounded workable. Interestingly, comparing the two drivers side by side, the surrounds and cones, magnet diameter and height, and the top plate / outer magnet gap plate have the exact same dimensions. Hmmm, intrepidly, IF the voice coil were same diameter and similar windings, just better high temp materials, maybe it's possible to transplant the SP1044 guts into an older chassis. Lots of work for a Frankendriver. I have since sourced a pair of original B139 to use, currently frame is raw metal, not painted black like IMF used.

    A more likely solution is to custom design and 3D print (in suitably strong plastic) or CNC cut an adapter plate out of wood and then use the smaller chassis SP1044. I suspect the drivers to be similar enough acoustically that you could get away with it, maybe with a slight mod to the crossover, maybe to pad them down a little because of higher power handling and maybe a slight increase in nominal output per watt sensitivity.

    It's a good question to put to Malcolm Jones and Jerry Bloomfield of Falcon. Hmm, maybe they could come up with a recone kit for the older driver? How to center the voice coil though since no access for shims?
     
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  19. mech986

    mech986 Text ↓ optional Posts:>18,000 Subscriber

    Messages:
    19,276
    Location:
    La Habra, California, USA
    It appears that Laminex (NZ) 1934, Formica (1912), and any European / UK equivalent, are all very similar resin based building and decorative surface materials. Use of these as thin board interior surfaces all started in the 50's and blossomed in the early 60's. The only brochure I could find so far on the Monitor III is the US based IMF / Fried written document which lists them as Formica covered, but I'm sure that's almost used as a generic term.

    Interestingly, the Laminex and Formica companies are now owned by one NZ based conglomerate.
     
  20. IMF_Pioneer

    IMF_Pioneer Active Member

    Messages:
    189
    Location:
    Australia
    I never thought I'd be looking at Laminex as a product to research back on, but I have and it's rather interesting on how it all came about. I've always thought of it as a 1970's product but found it was a product that has a long history of constantly re-inventing itself in new products.

    I guess we learn something new everyday if we're interested.
     

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