Most neutral pre to use Stereomour II as Power amp

DPetrini · 5705

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Offline DPetrini

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on: September 27, 2023, 08:40:16 PM
Still enjoying big Time stereomour II. Will soon add a dac with much lower output voltage and the Need to increase gain Will became a reality. Is the beepree2 the inique choice(Will Need to save before buy) or the moreplay might be a choice as well? What Is the main Sonic signature of the Two when compared? Bottom line,Will the moreplay increase gain in my system succesfully or Will i get a decrease of the stereomour sound quality ,unless i use a beepre? Thanxs

Daniel
Good hand at solder , badhead in electronics


Offline Paul Joppa

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Reply #1 on: September 28, 2023, 02:52:42 AM
How much gain do you need? Can't really answer this question well without knowing. What is the peak output voltage of the DAC?

Paul Joppa


Offline DPetrini

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Reply #2 on: September 28, 2023, 04:09:38 AM
Dac Is 2v compared to actual 2.6. Speakers are 88db and i estimate i Need 6-9db max gain extra compared to today

Probably you can calculate Better based on 2.6 vs 2 Volts dac out
« Last Edit: September 28, 2023, 04:12:30 AM by DPetrini »

Daniel
Good hand at solder , badhead in electronics


Online Paul Birkeland

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Reply #3 on: September 28, 2023, 05:45:44 AM
The gain of the Stereomour is about 8x, and 3.5W into 8 ohms is 5.3V.  You will want a minimum of 0.7V of signal going into the Stereomour to push it to full power with the volume control at maximum.  I do not think you need a preamp.  You can grab a little bit of extra gain by bypassing the cathode bias resistors on the 12AT7s if absolutely necessary.

Paul "PB" Birkeland

Bottlehead Grunt & The Repro Man


Offline DPetrini

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Reply #4 on: September 28, 2023, 06:10:30 AM
Thanxs for the encouraging response. All the best

Daniel
Good hand at solder , badhead in electronics