Tivoli Model ONE vs. KLH Model TWENTY ONE

Hello tiefbassuebertr,
thank you for answering. For me it would not be neccessary to receive the original parts. I would also be happy with replacements. Of course the pins and the data have to be the same. Do you have a hint for an alternative variable capacitor and FET (U72)?
Wolfgang
 
Tone control modification for Tivoli Model One

Hi .. I have a Model One and whilst the sound is good, I find the level of bass is higher than it needs to be for general radio listening in the kitchen. I have blocked off the baffle on the base of the unit and this does help somewhat. I was wondering if anyone has tried to add a variable tone control to the Model One or to permanently reduce the level of bass. Ideally this would be done before the amplifier, however perhaps a simpler approach would be a fixed high pass crossover filter between amp and speaker. Has anyone tried this ? Does anyone have any suggestions for an appropriate circuit design ? Many thanks
 
Hi .. I have a Model One and whilst the sound is good, I find the level of bass is higher than it needs to be for general radio listening in the kitchen. I have blocked off the baffle on the base of the unit and this does help somewhat. I was wondering if anyone has tried to add a variable tone control to the Model One or to permanently reduce the level of bass. Ideally this would be done before the amplifier, however perhaps a simpler approach would be a fixed high pass crossover filter between amp and speaker. Has anyone tried this ? Does anyone have any suggestions for an appropriate circuit design ? Many thanks

adding a nonpolar capacitor, or reducing the value of an existing one, anywhere in the audio signal path, will probably get you a decent result.
the value depends on the impedance of the circuit at the point where you add/alter it and the frequency where you want the rolloff to begin.
using the PAL schematic as an example, you could change C1 from 100nf to 50nf or less or you could change C7 from 220nf to 100nf or less.
 
Last edited:
Disabled Account
Joined 2010
We had exact the same problem.
After some investigations I can say I have it fixed now -
at least according to the taste of my wife an me.
Give me a bit time, I have to look for some documentation.

I am sorry to say that I did not document my patches.
From my recollection I did the following

Dismantle Tivoli Radio - inside the "high end" you will find a mess of cheap far-East stuff that looks like transistor radios pcbs of the seventies.

There is a quad operational amp inside, a chip with 14pin.
Audio signal internally is stereo, i.e. half chip/channel.

Apply some 1khz square signal to aux input.

Check the corner pins of the IC with an oscilloscope - each corner pin is an opa output.
You will find two outputs with significant overshoot - this indicates audible treble boost.
Connect both inputs via 1k resistor resulting in a mono output.
Route this mono output to the input of power Amp (TDA....) via a coupling cap.
The smaller the value, the less bass will be produced.
I forgot the value I inserted, but 100nF foil cap may be a starting value.
Before doing that you have to disconnect the existing input coupling cap of TDA....from existing signal path.





Apply 1khz square signal to aux input.
 
Last edited:
Thank you all very much for your replies. The capacitor before the speaker looks simplest ... and I may go this was I do not have an oscilloscope handy. However Voltwide ... can you advise why you suggested making the internal mono ? i.e. would it be simpler to keep stereo and just change out two capacitors instead ... one for each channel ? As suggested by Steve I could look for the equivalent of C7 in the PAL circuit at Harry's radio's: Tivoli PAL and change this for each channel ?

Also it looks as if Tivoli boost the bass level somehow perhaps in this stage. Looking at the PAL circuit, could a POT be used instead to make the roll off frequency somewhat variable ? This could be made accessible via rear panel.

Thanks Alister
 
Hi .. I have a Model One and whilst the sound is good, I find the level of bass is higher than it needs to be for general radio listening in the kitchen. I have blocked off the baffle on the base of the unit and this does help somewhat. I was wondering if anyone has tried to add a variable tone control to the Model One or to permanently reduce the level of bass. Ideally this would be done before the amplifier, however perhaps a simpler approach would be a fixed high pass crossover filter between amp and speaker. Has anyone tried this ? Does anyone have any suggestions for an appropriate circuit design ? Many thanks
The "MODEL ONE" is actually a vented loudspeaker box. This means, you can also use this box as closed box. If you close the vented area, you will get more bass in the lower region and less bass in the upper region.

There are more threads in case of the Tivoli Modell ONE and PAL:
http://www.diyaudio.com/forums/full-range/53392-drivers-used-tivoli-model-one-2.html#post4197451 (TSP parameters for internal used full range driver)
http://www.diyaudio.com/forums/solid-state/225034-upgrading-tivoli-model-one.html (Upgrading hints)
http://www.diyaudio.com/forums/analogue-source/264730-tivoli-model-two.html#post4197469 (schemas)
http://www.diyaudio.com/forums/solid-state/236308-tivoli-model-one-problem.html (only low level reproduction)
Test report:
http://herculodge.typepad.com/hercu...r11-against-his-wr1-and-tivoli-model-one.html
 
Last edited:
Pictures from inside MODEL THREE

even less service-friendly than model ONE
 

Attachments

  • DSCF6551.jpg
    DSCF6551.jpg
    988.1 KB · Views: 186
  • DSCF6539.jpg
    DSCF6539.jpg
    984.4 KB · Views: 198
  • DSCF6535.jpg
    DSCF6535.jpg
    971.2 KB · Views: 175
  • DSCF6533.jpg
    DSCF6533.jpg
    987.5 KB · Views: 184
  • DSCF6531.jpg
    DSCF6531.jpg
    989.5 KB · Views: 187
  • DSCF6529.jpg
    DSCF6529.jpg
    997.2 KB · Views: 141
  • DSCF6527.jpg
    DSCF6527.jpg
    984.8 KB · Views: 110
  • DSCF6525.jpg
    DSCF6525.jpg
    988.1 KB · Views: 137
  • DSCF6523.jpg
    DSCF6523.jpg
    1,000.2 KB · Views: 105
  • DSCF6521.jpg
    DSCF6521.jpg
    1,007.4 KB · Views: 126
The URL under
Tivoli Audio Service Manual - EspoCRM Open Source Community Forum
provide in post #2 a link for download an original Tivoli service manual.

I am looking for portable stereo radio recorder in the kind of those under
PHILIPS D8454-00,02,05 SM Service Manual download, schematics, eeprom, repair info for electronics experts
where are one of the follow RF ICs operates in the AM/FM front end:
TEA5710T-TEA5711T-TEA5710-TEA5711
If I know this, I can order the service manual with adjustment instructions in cases, when I get a Tivoli device, where correct adjustment changed.
Thank you for advices.
 
Last edited:
No news?

CONSUMER ELECTRONICS REVIEW
Kloss Model One vs CSW Model 88 & Bose Wave
Geek.com Consumer Electronics Review: Table Radio Showdown: Kloss Model One, CSW Model 88, Bose Wave
dead URL - go to
https://web.archive.org/web/20111211015856/http://www.geek.com/hwswrev/conel/tabrads/index.htmI am looking for a replacement driver (full range speaker chassis). Parameter I had measure several years ago - go to post #11 under
https://www.diyaudio.com/community/threads/drivers-used-in-tivoli-model-one.53392/
 
Last edited:
The URL under
Tivoli Audio Service Manual - EspoCRM Open Source Community Forum
provide in post #2 a link for download an original Tivoli service manual.

I am looking for portable stereo radio recorder in the kind of those under
PHILIPS D8454-00,02,05 SM Service Manual download, schematics, eeprom, repair info for electronics experts
where are one of the follow RF ICs operates in the AM/FM front end:
TEA5710T-TEA5711T-TEA5710-TEA5711
If I know this, I can order the service manual with adjustment instructions in cases, when I get a Tivoli device, where correct adjustment changed.
Thank you for advices.

Concerning the variable capacitor (tuning knob) there are here hints:
https://www.diyaudio.com/community/...r-of-am-fm-trimmer-variable-capacitor.333154/
Here the part No of this variable capacitor (keyword for Google: PVC = Polyethylene Variable Condenser or Polyvaricon) from Teac and Philips:

1) Teac R1: "HF443CAB02"
http://www.newcont.com/ProDetail.aspx?Proid=72found under
https://www.manualslib.com/manual/1401714/Teac-R-1.html?page=11#manual
2) Philips AJ3920, AZ1202, AZ1008 "4822 125 50681"
 

Attachments

  • Teac-R-1-Service-Manual.pdf
    5.5 MB · Views: 77
  • Philips-AZ-1202-Service-Manual.pdf
    5.1 MB · Views: 66
  • PHILIPS_AZ-100800.pdf
    7 MB · Views: 85
  • Philips-AJ-3920-Service-Manual.pdf
    2.8 MB · Views: 55
  • TEA5711T_PhilipsSemiconductors.pdf
    520.9 KB · Views: 48