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Old 15th June 2012, 08:04 AM   #1
jrobson is offline jrobson  South Africa
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Default 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.
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Old 15th June 2012, 03:34 PM   #2
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Depends on your speakers. If they are >90db efficient (recommended for SET amp like Tubelab SE), 2V should be fine.
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Old 15th June 2012, 03:37 PM   #3
jrobson is offline jrobson  South Africa
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Surely the speaker efficiency won't affect amp clipping?
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Old 15th June 2012, 04:04 PM   #4
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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.

Last edited by boywonder; 15th June 2012 at 04:22 PM.
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Old 16th June 2012, 03:37 PM   #5
jrobson is offline jrobson  South Africa
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Perfect thanks!
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Old 8th December 2012, 11:14 PM   #6
cotdt is offline cotdt  United States
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Quote:
Originally Posted by boywonder View Post
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!
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Old 9th December 2012, 01:51 AM   #7
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Quote:
Originally Posted by cotdt View Post
You need to run your 300Bs harder! Higher voltage!
How do know what voltage I'm running the 300B's at?
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Old 9th December 2012, 04:33 PM   #8
cotdt is offline cotdt  United States
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Quote:
Originally Posted by boywonder View Post
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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