Cosmetics: Dual LB-19 Plinth Mod.

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nebulix
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Cosmetics: Dual LB-19 Plinth Mod.

Post by nebulix » 20 Oct 2018 23:41

I've been wanting to transplant my 1249 into an LB-19 plinth, as I like the more modern look. I came across a 504 today and swapped the bases. The LB-19 is the low-profile, plastic tray style base, with the thin strip of imitation walnut around the edge. From what I can see, the frame is made from three strips of particle board covered in that retro brown plastic woodgrain.

I'm wondering if anyone on the forum has had any luck taking this apart and replacing with real wood? Attached is a photo from Pinterest where it looks like the guy may have replaced the frame with real wood, or perhaps refinished it somehow. From my experience, that 1970s plastic walnut "grain" doesn't take to stain very well.

I have a wood shop and some stock oak that I plan to use. Maybe I can just take the staples off the bottom tray and build a frame around that. Any suggestions would be appreciated.

I think the Pinterest deck looks great (don't know who the owner is), with the ebony spikes and the 1249 transplant. That's the type of look I'm going for.

The first photo is Pinterest, and the second is my 1249 with an LB-19 base and funny chrome feet.
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nebulix
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Re: Cosmetics: Dual LB-19 Plinth Mod.

Post by nebulix » 21 Oct 2018 06:05

I think I found what I was looking for on the Dual 721 Appreciation thread. Just last week, Scorpio333 posted pictures of his teardown of a 721 plinth and routing out the pieces for an oak base. Very nice job.

mrow2
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Re: Cosmetics: Dual LB-19 Plinth Mod.

Post by mrow2 » 21 Oct 2018 07:47

It's a nice style. But don't do it to improve the sound, there will be no difference. Lot of work but if you have the time...

T68
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Re: Cosmetics: Dual LB-19 Plinth Mod.

Post by T68 » 21 Oct 2018 09:20

I'm looking into something similar on my 1225 (no big fan of the stock plastic/faux wood base).
So the other day I found some wood veneer with adhesive stick on back side on sale that I ordered on line.
We'll see how that "lipstick on a pig"-project turns out. Will report back even if I fail miserably.

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Re: Cosmetics: Dual LB-19 Plinth Mod.

Post by mrow2 » 21 Oct 2018 19:51

The trick will be to have it look flat on that surface and for the edges not to be visible (thus revealing it's thin veneer).

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Re: Cosmetics: Dual LB-19 Plinth Mod.

Post by nebulix » 22 Oct 2018 08:36

I'm really only interested in the aesthetics at the moment, rather than making a more solid base, sound-wise.

I thought about veneer, but I'm not very good at it. I had a bad experience doing a pair of speakers a while back. I would think the challenge is folding it over the corners without it splintering.

So it appears all these tray-style Dual plinths have an upper plastic insert and a lower "litter box" tray. They're held together with staples. It would appear that you would have to destroy the particle board strips to get it apart, and then replace them with wood.

I'm going to wait to get another donor plinth and try it on that, rather than ruin this one.

The other alternative, which I've done in the past, is just to spray paint it semi-gloss black. It's quite a nice finish actually, and there was a factory black option on some Dual TTs. T68, I'd be interested to hear how you do with your 1225 and the veneer.

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Re: Cosmetics: Dual LB-19 Plinth Mod.

Post by nebulix » 22 Oct 2018 09:06

I'm actually not sure now, if that low-profile plinth is an LB-19. From information I've gleaned from old Dual brochures, these are the plinths I found (not including the United Audio bases)...

3-Screw:
LB-19 16-1/2 x 14-1/4 x 3-1/8 tray base
WB-19 17 x 14-1/4 x 3-1/8 walnut veneer

2-Screw:
LB-12 16-1/2 x 14-1/4 x 3-1/8 tray base
WB-12 15-5/8 x 13-5/8 x 3-1/8 walnut veneer
MB-10 15-7/8 x 13-3/4 x 3-1/2 molded base

Although the "thin" base ends up having the same height as the LB-19, there's less wood on the sides. Anyone happen to know the model of that base?

It seems to be a later design that shipped with the 721, 601, 1249 and others. We also had a 1210 when I was a kid, that came with a nice sturdy Noresco-branded walnut base. It must have been 4" high.

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Re: Cosmetics: Dual LB-19 Plinth Mod.

Post by scorpio333 » 07 Nov 2018 04:03

nebulix wrote:
21 Oct 2018 06:05
I think I found what I was looking for on the Dual 721 Appreciation thread. Just last week, Scorpio333 posted pictures of his teardown of a 721 plinth and routing out the pieces for an oak base. Very nice job.
Thanks! I don't get around here as often as I like, so I just saw this. I just posted a thread about how to tear down a Dual plinth. Might Help what you're trying to do.

viewtopic.php?f=37&t=107960

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Re: Cosmetics: Dual LB-19 Plinth Mod.

Post by mrow2 » 07 Nov 2018 19:56

3 posts up the original poster said it would be done in part to improve the sound. Again, with Dual it makes no difference. The acoustic improvement with walnut sides will be imagined. The aesthetics may be improved, however, and especially if you have a wood shop, it makes a neat project. For possibly a slight acoustics improvement you can add mass and quietness to the plastic litter tray with a thin layer of plasticine inside (I am thinking ¼ inch or lower on average going to less than that if there are any parts which come close to the bottom). Not all bases are the same (just as you noted), some are essentially litter trays without the MDF on the sides, and other units have the MDF and stapled pieces. The base you have is a really nice look and real wood "wood" make it really neat. Not sure if there's anything better than plasticine, with less of an odor perhaps. With a tray full of clay, the identifying smell would linger for some time.

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Re: Cosmetics: Dual LB-19 Plinth Mod.

Post by nebulix » 10 Nov 2018 07:31

Thank you Scorpio333 -- that's very helpful. I'm going to attempt this next time I'm up north at my shop. I have a router table to run the oak strips through. I was just curious how to separate the fake wood/chipboard from the bottom litter box and top insert. It's encouraging to see that someone else has done it successfully.

As I mentioned earlier, it's purely for cosmetics, as I think this base looks cool with the 1249. Thanks mrow2 for the suggestion to fill the litter box with something dense. Heck, maybe even a layer of thinset mortar would do, if it would stick to the plastic somehow.

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Re: Cosmetics: Dual LB-19 Plinth Mod.

Post by T68 » 10 Nov 2018 15:27

While waiting for wood, inspiration and a helping hand to build a new nice base for my 1225 I did this little quick-and-dirty job with some adhesive cherry wood veneer on the stock ugly plastic base.
Being "lipstick on a pig" I think it came out ok :D !

And using the original base I can still use the original dust cover that has hinges that goes down in slots (can be tricky to solve if you build something new).

Well, darn it if the deck also sounds a little better too now (placebo, I know)!

Some before and after pics:
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vinyl master
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Re: Cosmetics: Dual LB-19 Plinth Mod.

Post by vinyl master » 10 Nov 2018 21:21

Very nice work, T68! This hobby is nice that even if the sound doesn't improve with these "upgrades", at least it shows how creative one can be in re-imagining the designs to suit our tastes...People add decals, spoilers, and various accessories to their vehicles all the time...They can even give them new paint jobs and re-upholster the seats...Unless you change out the engine and drop a new one in, the car doesn't necessarily run faster, but it can look cooler with the accoutrements...And if you're having fun with it, that's what counts! =D>

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Re: Cosmetics: Dual LB-19 Plinth Mod.

Post by ravelax » 10 Nov 2018 23:05

Wow, that looks amazing! I dig the fake wood on the sides of the stock plinth, it actually took me a while to discover it was fake and not two pieces of actual wood glued onto the sides of the plastic base! I've always felt it's a shame the wood look is only on the sides, though, so I might be tempted to give a veneer job a go myself. Where did you get your veneer, and was it easy to work with?

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Re: Cosmetics: Dual LB-19 Plinth Mod.

Post by T68 » 10 Nov 2018 23:57

I got it from an arts and crafts material retailer here in Sweden. It's called "barc wood" and comes in rolls of 60x30cm. Works just like vinyl stickers.
It's thin and pretty easy to work with. Just can cut it with carpet knife or scissors.
And get some extra so you can practice corners :-)

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Re: Cosmetics: Dual LB-19 Plinth Mod.

Post by mrow2 » 11 Nov 2018 00:51

Looks very nice!!

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