2 KEF Concerto's are dead now ...

[eschenborn]

Old Falcon/Kef electrolytics were rather of "raw" than "plain" family. Be careful especially with the 80uF shunt caps going to ground. If you have to use plain, insert about 1R -2R resistors in series with them. Good luck, Eric.

To my experience, Alcap LL versions ("low loss") are indeed plain caps. the others are raw, but come in different voltages up to 150V, where the higher voltages are the better caps – but should not be indiscriminately interchanged. Falcon has less and less genuine Alcap LL caps, and also less high voltage versions of the raw caps. They used the same manufacturer as Mundorf does for making substitutes – which is Fischer & Tausche in Husum, Germany (lately bought ab by a big corporation) – and printed ALCAP specs on the sleeves.

@Eric Stockman , how do the Concertos sound now with the new crossovers?

I had no longer received notifications about posts in this thread (for whatever reason), so I am a bit late to comment now. apologies!

 

[Eric Stockman]

I had no longer received notifications about posts in this thread (for whatever reason), so I am a bit late to comment now. apologies!

Hello Mr. Eshenborn ! I'm glad you're still doing well! Honestly, I thought it was weird that you suddenly stopped responding to this post.

But you could also have gotten sick in the meantime, but glad you're 'back on board' 👍

 

[Eric Stockman]

@Eric Stockman , how do the Concertos sound now with the new crossovers?

Well, the Concertos sound good, but there's something else I need to figure out first.
If I had bought the Concertos, I had the impression that the bass of one of the B139s functioned less well than the other.
But I thought the 'crossover recap' would have solved this problem , but unfortunately the result remained the same.
I am currently working on a 'repaint job' of the Concerto's, but afterwards I will do some further research myself.
(swap both speakers , to see if the error is not coming from the amplifier, or turn the B139 by 180 degrees, or install a 'new' B139).
But that's for later. First clean-up of the cabinets. One is already done (see pictures)

 

[Eric Stockman]

I am still looking for the Phoenix PCB terminal block - PTS 1,5/8-7,5-H - 1703091 (https://www.mouser.be/ProductDetail/Phoenix-Contact/1703091/?qs=YjJcVSlHJPXSs4ICjVsssQ==) or 1988163.

But I think the 1988163 gives a better contact :
https://www.mouser.be/ProductDetail/Phoenix-Contact/1988163?qs=gjk32EaArKI3WGAgzgNDtQ==

In the meantime I soldered the wires directly from the PCB to ensure a good connection.