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Thorens TD-145 Mods- "unexpected" results?!

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Thorens TD-145 Mods- "unexpected" results?!

Postby garpt » 13 Mar 2012 16:46

NEED THORENS/ DIY EXPERTS!

Hi All,
Completed most of the so-called Chadwick Mods (and others) over the course of the last few weeks. Dynamat damping (under deck) cork damping (TT sub-deck), top deck dynamat around subplatter, remove sponge rubber from springs, clean and adjust springs,replace bottom board w/ 3/4" Aspen wood. Replace stock TT mat. (used quality felt- type material.)

OTHER MODS: Spike feet, BREN-1 TT clamp, careful TT leveling, properly aligned Stanton 681eee cartridge w/new Pickering NOS D625. Interconnects replaced with interchangeable Wire World Horizons, cardas rear plinth mounted RCA's..

The "problem", although I don't think its really considered a problem, is that the TT sound has changed quite dramatically. Of course, wow/ flutter has almost disappeared completely. Thats VERY good! The bass has lowered to absolutely TIGHT down at LEAST another octave. Noise floor/ background is substantially better.
SO, whats wrong? I feel like the sound is almost tooo "Tight", if that's the proper description. The higher bass registers, the frequencies I would guess around 200-400 Hz has been subdued / suppressed to the point of seemingly losing some body and "PRAT", for lack of a better term. The sub-bass, however is TREMENDOUS and clean. I just feel like there is a bit of a "hole" in that range that is SO important for most modern music. Of course, my subwoofer IS a TRUE sub woofer, an SVS tube, tuned to around 80 Hz. so it is not helping much in my perceived sound "hole". I guess it's a little of that Thorens "personality" , or sound, that has been diminished somewhat.

Any suggestions for fixing this dilemma? The plusses seem to far outweigh the negatives, so all in all it was worthwhile work, and a lot of it. I can hear what a modern TT that costs a couple grand probably sounds like. The sound almost took on some digital qualities while still retaining a lot of analog warmth and resonating deep sub bass.
I'm thinking- maybe something like adding a 8" subwoofer to pick up some of that range? Any other tuning things or mods I can try? Don't want to spend a lot of money. I already have quite a bit into this project!

An interesting dilemma.

Looking forward to some input.

Thanks All!
Gary
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Re: Thorens TD-145 Mods- "unexpected" results?!

Postby alternativeroute » 13 Mar 2012 19:12

What support you using... I was highly disappointed going from this:

Image
Thorens Td150 MkII re-plinth - 15 second bounce by arclients, on Flickr

My test and setup jig...

to this:

Image
Thorens TD150 MkII replinth - #1 by arclients, on Flickr

Turned out that the brass cones killed the life of the table. When I changed the feet to stock rubber type feet the table came back to life...

I have to admit though that I smudged my results as I also changed the bearing oil for a lighter/thinner oil. So it could also have been that.
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Re: Thorens TD-145 Mods- "unexpected" results?!

Postby garpt » 13 Mar 2012 21:34

Well,
I have to admit, I did go to spikes (only the other way around from yours) but I couldn't put my finger on exactly what mod made the difference- I guess I should have taken more time with w/ each one by doing longer listening tests. It could have been the spikes, or it could have been the heavy base (the 3/4" Aspen wood)- but everyone who wrote about it said the heavier base was the biggest improvement of all the mods.
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Re: Thorens TD-145 Mods- "unexpected" results?!

Postby garpt » 14 Mar 2012 01:55

alternativeroute wrote:What support you using... I was highly disappointed going from this:

Image
Thorens Td150 MkII re-plinth - 15 second bounce by arclients, on Flickr

My test and setup jig...

to this:

Image
Thorens TD150 MkII replinth - #1 by arclients, on Flickr

Turned out that the brass cones killed the life of the table. When I changed the feet to stock rubber type feet the table came back to life...

I have to admit though that I smudged my results as I also changed the bearing oil for a lighter/thinner oil. So it could also have been that.


By the way, alternativeroute, that's a beautiful TD-150. I used to have one, long time ago. Sold it for a song. It was the reason I got this TD-145, N.O.S., a couple of months back!
-GT
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Re: Thorens TD-145 Mods- "unexpected" results?!

Postby rkay5 » 18 Mar 2012 23:32

Hi,
I also have modified thorens TD150 and TD166mkII and have found that metal cones do not work well rubber or like rubber are the way to go.
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Robert
Thorens TD150/Sole sub-chassis/Mose+Hercules/Audioquest PT-7/Denon DL304/Jolida JD9 phono/Creek Evo,5350/Mytek Stereo 192DSD DAC
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Re: Thorens TD-145 Mods- "unexpected" results?!

Postby garpt » 19 Mar 2012 03:44

rkay5 wrote:Hi,
I also have modified thorens TD150 and TD166mkII and have found that metal cones do not work well rubber or like rubber are the way to go.
18191
18193


Thanks rkay5,
That seems to be the concensus- I'm playing w/ different subwoofer settings and placement and such- I think I should just try the easy route and change the feet!

I will do that and report back..........

GT
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