Thommessen amp module!!!!!

[VT67]

And here's a shot of the whole board.

Quality of the board isn't al that great. If you try to desolder something you have to be very careful because before you know it the solderpads are coming of also

Regards

 

[jacco vermeulen]

Is that how the board came out of the subwoofer, with all the solder residu spots on it ?
The solder drible between the red power line and the ground plane gives me goose skin.

 

[clem_o]

GeWa,

What's the model of your DSO? Someone might be able to walk you through setting it up. I'll be happy to help you out if that's a Tek TDS series...

Cheers!


Chris,

Many thanks for the info. We have the black colored ones here too, and they have a nasty habit of blowing up way below spec. Sigh...

 

[phase_accurate]

and they have a nasty habit of blowing up way below spec. Sigh...

Fakes ????

regards

Charles

 

[clem_o]

Fakes ????

Yes, apparently so- they're ridiculously cheap. Sad part about this is, even if one's willing to pay the 'proper' price, there's none to be found here (in Manila, that is) AFAIK.


Cheers,


Clem

 

[jacco vermeulen]

there's none to be found here (in Manila, that is)

Clem,

not here either. (Europe, that is)
Best chance is with someone who has leftovers.
Or stumbling on someone who is retiring and quitting the repair business.
(like i did, and bought 4 batches of devices in the original Japanese packaging)

 

[VT67]

clem_o

What's the model of your DSO? Someone might be able to walk you through setting it up.

To be a bit more specific: it's a digital scope that works in combination with a PC. Below there's a link to the manufacturers (Velleman) website

Velleman PC Scope

Regards

 

[anatech]

Hi Clem,
Mine are real. They survived in some big amps. Original finish and laser etching.

-Chris

Walter,
The biggest thing to watch out for is the common ground on your computer. Depending on the computer, you may have some slight noise. I hear they are supposed to work reasonally well.

-Chris

 

[clem_o]

To be a bit more specific: it's a digital scope that works in combination with a PC. Below there's a link to the manufacturers (Velleman) website

Seems like a fine instrument - features list says its optically isolated from the PC, so noise coupling problems should be minimized. Do you have it set up? Here are the steps if so (best guess):

1. Connect DSO CH1 to amplifier output (speaker + and -).
2. Turn on DSO, PC and amplifier
3. Input a sine-wave at 100Hz to amplifier and crank up volume until distortions are audible (you can use your sound card with appropriate software to generate a sine-wave)
4. Run DSO software on PC and select "oscilloscope" button
5. Select CH1 "on"
6. Select "L" (linear) from the S/L button
7. Click on "Auto Set" of CH1.

At this point you should be looking at a stable waveform on your PC's screen

8. Click 'File'
9. Click 'Save Image', navigate to where you want to save, give it a filename.

Repeat steps 7 to 9 but this time with the LF driver disconnected (output of amplifier without speaker load).

Cheers!!

 

[clem_o]

not here either. (Europe, that is)
Best chance is with someone who has leftovers.
Or stumbling on someone who is retiring and quitting the repair business.
(like i did, and bought 4 batches of devices in the original Japanese packaging)

Mine are real. They survived in some big amps. Original finish and laser etching.

You guys are lucky!

Does anyone have a design for an instrument to characterize transistors? Programmable, portable, maybe PC-based, catering to a wide range of currents and frequencies...

Cheers!

Clem

 

[anatech]

Hi Clem,
Both HP and Tektronix make or made these very pricey beasts. I think to be realistic you have to find a used one in great condition. THe other way is to define your tests and build an instrument that will measure a couple parameters. You can add to it or build other jigs later.

-Chris

 

[clem_o]

Hi Chris,

Thanks for the info.. have to start looking at the surplus shops once again, don't recall seeing anything like them before. I was able to get a Tek DSP-based distortion analyzer and a Fluke Pulse Generator years ago (at a very good price I might add), but that was about it.

Cheers

Clem

 

[anatech]

Hi Clem,
This stuff is lab equipment. It's big. It's expensive. It probably would take a year to learn how to use it. Curve tracers were the norm years ago.

Heathkit made a semiconductor curve tracer. It connects to a scope.

I really think you should try to simplify your requirements. If you look in the Motorola manuals, they give you test jigs for each measurement. In the app notes you can see some of the crazy non-inductive loads they constructed. If you really want to test these parts, test them per the data sheet. I think you are further ahead measuring capacitance and gain. Also have a real good look at the case and compare it to similar parts. You can always push dissipation within the SOA curves if you really want to make sure.

-Chris

 

[clem_o]

Hi Chris,

This stuff is lab equipment. It's big. It's expensive. It probably would take a year to learn how to use it.

Ah, you mean "that" kind or equipment! 🙂.. I'll have to wait for a semicon firm to shut down here... !!

Cheers

Clem

 

[tiefbassuebertr]

Dear forum members

Is there anybody out there who has a schematic of the PROTEUS 1.6SW amplifier module from Thommessen? The one I have died on me since the last electrical storm we had.
Music doesn't sound al that good without my active sub.
Thanks in advance.

Walter

I am also looking for schematics.