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600/600 ohms InLine Switchable Audio Pad Attenuator
https://www.markertek.com/product/hk-112-6-6/600-600-ohms-inline-switchable-audio-pad-attenuator
Model HK-112 Audio Pad allows for finer steps of attenuation, 2.0 dB steps from 10 dB to 40 dB. This unit can be ordered at 600/600 ohm, 150/150 ohm and 600/150 ohm impedances.* The low end attenuation can be special ordered to …
HOW TO BUILD AN AUDIO PAD - FM Systems
https://www.fmsystems-inc.com/build-audio-pad/
The un equal impedance Pad can be used in either direction and combined with other Pads as long as the impedance matches at the connection …
Classic Audio Products, Inc.
https://capi-gear.com/catalog/product_info.php?products_id=254
The t-pad presents a consistent 600 ohm source and load impedance throughout it's entire rotation. This is the same configuration t-pad that is used for input attenuation in the popular 1176 FET compressor builds. It can also be used as the output attenuator in our VP25, VP26, VP312 and VP312DI mic preamplifiers.
THE 600 OHM AUDIO STANDARD, WHERE DID IT GO? - FM Systems
https://www.fmsystems-inc.com/the-600-ohm-audio-standard-where-did-it-go/
Long twisted pair 16 gauge audio transmission wires were found to exhibit impedances in the vicinity of 600 Ohms at voice and musical frequencies up to 15 KHz, so of course the source of the audio and the load at the receiving site must also be 600 Ohms in order to achieve maximum power transfer to the receiving equipment.
Audio Attenuators - Surplus & Sales
https://www.surplussales.com/Equipment/AudioAttenuator.html
Daven dual "T" pad attenuator. Dual 600 ohm. 100dB total; 10dB/step+OFF. 1/4" shaft x 0.875"L. 2-3/8" body diameter x 3-3/4" behind panel depth. New-unused. Bottom dust covers have cracks. NSN: 5905-00-812-1235. *** SOLD OUT *** Mallory 2 Terminal Rheostat 4 Ohm / 4 watt More Images (RWV) M4R
T-Pad / H-Pad Calculator - Resistor Values for Attenuation
http://www.nu9n.com/tpad-calculator.html
T-Pad / H-Pad Calculator. Resistor Values for Attenuation. Enter the impedance of the source device feeding the input of the Pad circuit. Enter the nominal impedance of the destination device you will be feeding audio to. Enter the desired attenuation needed in dB, up to, but not beyond 40.
Antique Radio Forums • View topic - T-pads 600 ohm
https://www.antiqueradios.com/forums/viewtopic.php?p=1686950
Im in the process of building a tube power amp with a 600 ohm input transformer and a preamp with a 600 ohm out to feed it . And was wanting to learn someting about 600 ohm T-pads like they used to use in audio boards . It seams a lot of the were Daven and the controls mosty were 600 ohm constant impeadance .
600-Ohm Impedance Matching Isolation Transformer ...
https://www.atlasied.com/lt600-vc
The 600 ohm input may be matched to 600, 10K and 25K-ohm circuits. All components are mounted on a printed circuit board. Steel chassis includes mounting ears and "insta-mount" tape. Transformer is shielded to minimize induced hum. Unit includes a phono jack on the output side for convenient connection to amplifier or other equipment circuitry.
Audio Pads | All About Circuits
https://forum.allaboutcircuits.com/threads/audio-pads.61788/
21,764. Nov 11, 2011. #8. Hello, With the given calculator you can create the attenuation pad needed. What you need to know is the input impedance, output impedance and attenuation. For example input 600 Ω, output 10 kΩ, 20 dB will give you the following circuit: This page from the wiki shows you some theory behind the attenuation pads:
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