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LG77 G2 and TheatreBrilliant looking room, Jack!
Small update for you folks. Yesterday I drove 250 miles round trip to pick up these bad boys:
This is a pair of MK2 BeoLab Penta amplifiers and I managed to also find them on FB Marketplace.
One of them is working fine but the other is blowing fuses apparently. In a little while I will go through and recap these just as I did the original pair. I’ll swap one of these (or whichever one is working) into the bad speaker and repair the original amp fully at a later date.
The cool thing about this project is once both of the naughty amplifiers are back in shape I will have a pair of spare amps to put to work! I think I will be 3D printing some accessory parts to make them look like BeoLab 200s.
I have been dreaming of this for 10 years…
Congrats, Leo! Please add your listening impressions of the BeoLabs after some listening time! The all-black BV7 looks awesome, too.
I’d be very interested to hear how/if you recommend the BL7-4. I’m running a BeoLab 10 as my center channel and I never thought I would need more from a center channel until I put it in-between a pair of Beolab 5s. The BeoLab 10 is of seriously outgunned on SPL and low end (not the BL10’s fault) but the timbre of the 10 and 5 are extremely different. I wish I could fit a third 5 underneath my BV. The Beolab 10 seems to be very midrange-forward compared to the 5s (much sharper in the HF). I wonder if people reading this have the same opinion? MY Beolab 10 sounds so “warm” in the middle by comparison that I wonder if the tweeter is operating correctly.
Today I finally replaced some unused coax wires with Cat7 cables and re-added my BeoMaster 6500 / BeoGram CD 7000 combo to my set-up. They are in the attic (study) and connected through a 1611 to go from MCL to ML, and a BLC to go from ML to NL.
I made a little overview of the whole network :-). 
Next trial will be to connect the BL4000s directly to the Core. Until now I kept them in the larger ML network to avoid sync issues, but if they sound better without the Active and BLC in the chain, I will see to fix any delay issues and get an IR eye connected to the Core for Beo4 control in the kitchen. Regards, JohanThis is a true “system”! Nice work integrating everything and that “little overview” is actually an epic graphic!
That BV10 looks great by the way. I always miss mine.
Thanks, Johan! I’m very pleased that it worked on the first iteration. It does indeed have a groove that fits between two of the heatsink fins. It gives a bit of flexibility to the angle. The only thing I might change is its overall angle, I think its too far laid on its back as the on-axis high frequency is reduced quite a bit compared to it standing up vertically as I had before. At any rate, it fits and works great. Check it out:
Last night was a late one with sparse meetings which means doing conference calls from the workbench in the garage. In between some of them I designed a new table stand last night to hold a BeoLab 4000 horizontally. Should be done printing when I get home.
If it fits / works well I’ll make the design available if anyone is interested.
Loving this thread
Glad you like it! Had to take a lunch break, now back at it.
Last night was when everything came back together. I hauled them up stairs and plugged them in to the AVP. Just in time to watch an episode of our current series before falling asleep.
That glorious moment I have been working toward had finally come – time to flip the switch(es)!
The left BeoLab played sweet, sweet music but the BeoLab on the right was playing very loud 60Hz. Something is very horribly wrong. Sadly they will probably just sit for a while because I have been going hard on this project lately and as I pointed out earlier, those amps don’t make life easy. So unless I find another amp to run them on temporarily, it will likely be a while before this gets wrapped up. Wales is calling.
Luckily they are nice to look at. Thanks for reading and following along! If you happen to have a spare, functional amplifier I’d love to hear from you. Additionally if you have an extra Penta tweeter (SEAS 25 TNF H386) I’d love to take it off your hands.
This isn’t over, but over for now.
Ok so I’m officially up the creek with only one working tweeter at this point. Being the time-impoverished individual that I am, I leapt up from my workbench and into the car. Drove up to the office to rummage around for some tweeters that might hold me over until I replace the fried one with another original SEAS unit.
We seemed to be overstocked on these [very old build] H26TG06-06 units. These are almost completely unmatched in every way from the originals acoustically but they are an epic tweeter overall. I had to take the waveguide off of course and add some branding because stickers make everything better. Also had to glue down the butterfly as the clips that hold the waveguide on also secure the butterfly.
I attempted to solder the broken lead wire but unfortunately it is coated so nothing stuck to it. Next path was to take the butterfly off and take a turn off the coil and unwind some fresh lead wire. Sadly some more bad evidence of restaurant thrashing was hidden inside.
I think someone cooked this coil a little too hard! The coil was loose in the gap and had come off the former!
Now its time to talk tweeters. As I mentioned earlier on, one of them was making zero output.
One of my eagle-eyed colleagues noticed that the lead wire was broken. The coil measured ok (from the broken end) so I decided to do a repair.
The worst of the sealing issues I found was actually around the twee-mid baffle edge. The foam is predictably rotted and without any life left however that wasn’t the worst part. Whoever assembled this foam tape originally back in the day completely missed the actual sealing edge / contour of the baffle. This is effectively an acoustical “short circuit”.
