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Modulus-86: Composite amplifier achieving <0.0004 % THD+N.
Modulus-86: Composite amplifier achieving <0.0004 % THD+N.
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Old 21st November 2019, 11:00 PM   #2431
tomchr is online now tomchr  Canada
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No. The THD of the amp is below the integrated noise of the analyzer.

The only way I can measure the true THD of the amp is by using a precision oscillator. Even then, I run into trouble as the analyzer section of the APx525 "only" has 125 dB dynamic range. I.e. its internal distortion is -125 dB. I'm working on getting some filters together such that I can attenuate the fundamental, thus, measure the distortion residual.

Tom
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Modulus-86, 186, 286, & 686: 40-240W (8Ω), <-120dB THD. HP-2 Headphone Amp: 660mW, <-130dB THD. Taming the LM3886.
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Old 27th November 2019, 10:16 PM   #2432
Sinthomnison is offline Sinthomnison  Spain
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Hi Tom,

I have doubts about the construction of the mod-86 as it will be paired with my Yarra Melbourne DB preamplifier (16dB gain).
Should I lower the gain of the mod-86 with THAT1206?

The speakers have an impedance of 8 Ω and 90dB/W/m.

Thank you
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Old 28th November 2019, 07:43 PM   #2433
tomchr is online now tomchr  Canada
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I would throw in a pair of THAT1206 when you place your order with Mouser. They're not very expensive. If you have trouble getting to a low enough volume level, swap the THAT1200 for the THAT1206.

Tom
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Modulus-86, 186, 286, & 686: 40-240W (8Ω), <-120dB THD. HP-2 Headphone Amp: 660mW, <-130dB THD. Taming the LM3886.
Neurochrome : : Audio - www.neurochrome.com - Engineering : : Done : : Right
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Old 28th November 2019, 08:49 PM   #2434
zgtc is offline zgtc  Europe
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Modulus-86: Composite amplifier achieving &lt;0.0004 % THD+N.
Quote:
Originally Posted by tomchr View Post
I would throw in a pair of THAT1206 when you place your order with Mouser. They're not very expensive. If you have trouble getting to a low enough volume level, swap the THAT1200 for the THAT1206.

Tom
THAT1206 is apparently no longer available at mouser?
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Old 28th November 2019, 08:55 PM   #2435
poseidonsvoice is online now poseidonsvoice  United States
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Modulus-86: Composite amplifier achieving &lt;0.0004 % THD+N.
Looks available in Farnell U.K.:

https://uk.farnell.com/that-corporat...=GRHB-OCTOPART

Best,
Anand.
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Old 28th November 2019, 09:00 PM   #2436
Sinthomnison is offline Sinthomnison  Spain
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Thank you, Tom. I appreciate your comments.
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Old 28th November 2019, 09:04 PM   #2437
Sinthomnison is offline Sinthomnison  Spain
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Quote:
Originally Posted by zgtc View Post
THAT1206 is apparently no longer available at mouser?



I found this in Mouser: https://www.mouser.es/ProductDetail/887-1206P08-U
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Old 28th November 2019, 09:16 PM   #2438
zgtc is offline zgtc  Europe
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Modulus-86: Composite amplifier achieving &lt;0.0004 % THD+N.
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Originally Posted by Sinthomnison View Post
My bad, thank you!
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Old 28th November 2019, 11:20 PM   #2439
tomchr is online now tomchr  Canada
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Yeah. Available at Mouser Canada as well. Search for the manufacturer's part number (1206P08) and you shall find.

Tom
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Modulus-86, 186, 286, & 686: 40-240W (8Ω), <-120dB THD. HP-2 Headphone Amp: 660mW, <-130dB THD. Taming the LM3886.
Neurochrome : : Audio - www.neurochrome.com - Engineering : : Done : : Right
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Old 1st December 2019, 05:37 PM   #2440
Nightpuma is offline Nightpuma  Norway
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Hi.

Just a quick question. Will it be a good option to build the Mod-86 with a volume control as an integrated amp?
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