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Audio Research SP9 hum problem | diyAudio
https://www.diyaudio.com/community/threads/audio-research-sp9-hum-problem.327799/
A friend of me have sometimes (temporarely) hum effects while turn on the attenuator knob resp. for volume control and balance (Audio Research part No resp. order code 45100528 and 45100529) - maybe through internal contact …
How to find and fix hum in 3 easy steps – PS Audio
https://www.psaudio.com/ps-how/how-to-find-and-fix-hum/
This hum is fairly low but still can be heard from the listening position ( 10 ft from loudspeakers) only between songs. When a song begins the low level hum can no longer be heard. The resolution of the system is not negatively affected at all when in play mode. The hum does not increase when the gain of the linestage is increased.
Audio Research
https://audioresearch.com/wp-content/uploads/2021/06/REFPhono_Manual.pdf
to minimize hum. All current Audio Research line stages utilize the latest digital microprocessors to control functions such as volume, input selection, balance, etc. Although the digital volume control is sonically neutral throughout its range, it is important to make sure that the output level of the source com-
User Guide - Audio Research
https://audioresearch.com/wp-content/uploads/2019/03/Ref-10-Line-Stage-Manual.pdf
Audio Research have spent countless hours of listening ... power line grounding of the Reference 10 chassis to provide absolute protection from electrical shock. ... but hum may be introduced into the preamp from the proximity of the amplifier’s power transformer.
D40 Manual - Audio Research
https://audioresearch.com/wp-content/uploads/2021/06/D40_Manual.pdf
audio research corporation 6801 SHINGLE CREEK PARKWAY MINNEAPOLIS, MINNESOTA 55430 $5.00 . ... cases, cause your audio system to have a residual hum. The only known way to prevent this hum, especially noticeable in bi- or multi-amplified ... power line except for the line cord Is grounding wire.
Audio Research – High-end audio equipment
https://audioresearch.com/
Audio Research continues its dedication to unparalleled musical expression and crafting components of the highest quality and lasting value for its customers. Our long-term dedication to service is peerless in this industry (Audio Research, with few exceptions, can repair anything ever produced during its entire history).
ARCDB
https://www.arcdb.ws/model/LS3
The Audio Research Database (ARCDB) provides information about past and present products from ARC (Audio Research Corporation) ... Noise & hum. 18 µV RMS maximum IHF weighted noise at main output with gain control minimum (more than 100 dB below 2V RMS output, or 4V balanced output (LS3B)) ... Line regulation better than .01%. Power ...
Audio Research
https://audioresearch.com/wp-content/uploads/2021/06/150.2.pdf
audio research HIGH DEFINITION@ agoo ANNAPOLIS LANE NORTH I PLYMOUTH, MINNESOTA 55447-5447 / PHONE: 763-577-9700 FAX: 763-577-oapa
Audio Research SP-10 Clone HELP please | diyAudio
https://www.diyaudio.com/community/threads/audio-research-sp-10-clone-help-please.210222/
Hmmm..From your explanation, it seems that hum is radiating from pcb copper trace of input tube. either from pin2 or pin7.. You can eliminate this hum by cutting the pcb trace and run a shielded wire instead to the gain control..the same thing with 0.47 copper trace to the grid of tube..hope this help. •••
PRE AMPLIFIER - THE HIGH END AUDIO STORE
http://www.cinereaudio.com/pre-amplifier.html
AUDIO RESEARCH SP-16 MADE IN USA Specifications: Frequency response Line: +0-1dB, 1Hz to 60kHz at rated output. -3dB points below 0.5Hz and above 100KHz Distortion (THD) Less than .007% at 2V RMS single ended output Noise & hum Line: 15µV RMS IHF weighted at main output with volume low (96dB below 1V RMS output). Gain
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