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-   -   TSE input (http://www.diyaudio.com/forums/tubelab/214531-tse-input.html)

jrobson 15th June 2012 09:04 AM

TSE input
 
Hi

I'm looking into building a proper DAC, just curious since the option is available, if there is any reason to use 4vrms out or stick to standard 2vrms? Would TSE clip with 4vrms input?

I don't mind turning the knob all the way up though, just curious if any more output will be seen with some gain on the input without clipping.

Evenharmonics 15th June 2012 04:34 PM

Depends on your speakers. If they are >90db efficient (recommended for SET amp like Tubelab SE), 2V should be fine.

jrobson 15th June 2012 04:37 PM

Surely the speaker efficiency won't affect amp clipping?

boywonder 15th June 2012 05:04 PM

I happen to have both of my tubelab SE's on the bench right now; a 45 version and a 300B version.

The 45 version clips at approx 1V RMS input and the 300B clips at roughly 1.5V RMS input.

I'm just eyeballing the sine wave for distortion/asymmetry on the scope at 60 hz and 10Khz.

jrobson 16th June 2012 04:37 PM

Perfect thanks!

cotdt 9th December 2012 12:14 AM

Quote:

Originally Posted by boywonder (Post 3060666)
I happen to have both of my tubelab SE's on the bench right now; a 45 version and a 300B version.

The 45 version clips at approx 1V RMS input and the 300B clips at roughly 1.5V RMS input.

I'm just eyeballing the sine wave for distortion/asymmetry on the scope at 60 hz and 10Khz.

You need to run your 300Bs harder! Higher voltage!

boywonder 9th December 2012 02:51 AM

Quote:

Originally Posted by cotdt (Post 3276689)
You need to run your 300Bs harder! Higher voltage!

How do know what voltage I'm running the 300B's at?

cotdt 9th December 2012 05:33 PM

Quote:

Originally Posted by boywonder (Post 3276810)
How do know what voltage I'm running the 300B's at?

I don't know, but with my 2V source I simply could not get the 300B to go into clipping. I just assume that maybe your voltages are not high enough.


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