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Old 20th January 2013, 06:10 PM   #1421
MiiB is offline MiiB  Denmark
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loudspeakers measure by the percentage... especially in the lower octaves.
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Old 20th January 2013, 06:21 PM   #1422
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The distortion has to be weighted by the frequency response though. For example you measure at 30Hz and the speaker is down by 12dB ( at 30Hz ) distortion is actually 12dB better then you measure. Nevertheless, the more excursion, the more distortion in general.
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Old 28th January 2013, 12:08 PM   #1423
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Default Attempt to do the simple TSSA (TT)

Hi, LC. Is the is latest updated TSSA TT ? Seems no much update about it (srry didn't go through whole thread) Anyone built it ? How does it sounds ?

I'm curious does 2 stage and three stage makes any difference in this case ?

Anything to take caution of, such as in this post:
Quote:
Post#61 - Idefixes, if you have thermal tracks than first make point to point wire nest. Mount TT-s on a heatsink, than step by step add and wire parts, similar like sonnya did. I think it is not very demanding job to do and test, before you go to PCB. You will also check if everything is OK and if the sound is acceptable.

And don't forget to thermally couple input pair.
Does the input pair need to couple each other only, or they also need to attach to the heatsink (thermally couple to TT output transistor)
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Old 28th January 2013, 07:28 PM   #1424
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Quote:
Originally Posted by guitar89 View Post
HDoes the input pair need to couple each other only, or they also need to attach to the heatsink (thermally couple to TT output transistor)
Yes, No.
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Old 28th January 2013, 07:53 PM   #1425
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is it a complete working curcuit ? shouldn't it have input series(base) resistor ?
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Old 28th January 2013, 08:02 PM   #1426
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Quote:
Originally Posted by tinitus View Post
is it a complete working curcuit ? shouldn't it have input series(base) resistor ?
You can get this working.
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Old 28th January 2013, 08:52 PM   #1427
tinitus is offline tinitus  Europe
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Quote:
Originally Posted by Lazy Cat View Post
Or even less parts solution with thermal track output transistors, where tracking diodes have double function: bias input pair and compensates thermal drift.
ah, I see it now...NJL thermaltrack interesting, and they are even cheap
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Old 8th February 2013, 09:01 PM   #1428
sonnya is offline sonnya  Denmark
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Hi all

From time to time i get asked what chassis and heatsink they should use.

So i plan to get a chassis folded with all holes laser Cut and painted.

It will be made for Dual and single supply.

It is intended for the TSSA V1.6 but could be for Any AMP

Is there Any interest for This?

- Sonny
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Old 8th February 2013, 09:07 PM   #1429
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Hi Sonny

Could use it for VSSA. Can you show us CAD drawings?

Regards L.C.
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Old 8th February 2013, 09:58 PM   #1430
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Default Chassis

Quote:
Originally Posted by sonnya View Post
Hi all

From time to time i get asked what chassis and heatsink they should use.

So i plan to get a chassis folded with all holes laser Cut and painted.

It will be made for Dual and single supply.

It is intended for the TSSA V1.6 but could be for Any AMP

Is there Any interest for This?

- Sonny
"A picture's worth a thousand words".

Ted
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