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National Select-O-Jet Model SAF-1 Vintage Audio Selectivity Accessory For the NC-125, NC-183, etc. RARE!

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MPN:
SAF-1
Condition:
Used
Shipping:
$17.00 (Fixed Shipping Cost)
  • National SAF-1 Select-O-Jet audio filter in very good condition. Classic 1950s tunable peaking/notch filter for National receivers like the NC-125. Great vintage accessory for improving CW and voice selectivity. Untested but excellent cosmetics – ideal for restoration or display.
  • National SAF-1 Select-O-Jet audio filter in very good condition. Classic 1950s tunable peaking/notch filter for National receivers like the NC-125. Great vintage accessory for improving CW and voice selectivity. Untested but excellent cosmetics – ideal for restoration or display.
  • National SAF-1 Select-O-Jet audio filter in very good condition. Classic 1950s tunable peaking/notch filter for National receivers like the NC-125. Great vintage accessory for improving CW and voice selectivity. Untested but excellent cosmetics – ideal for restoration or display.
$49.99
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Description

National Select-O-Jet Model SAF-1 Vintage Audio Selectivity Accessory For the NC-125, NC-183, etc. RARE!

 This Rare accessory is in very good condition. The front is pretty clean, the top has some marks from normal use. I have not used this with a receiver but they are pretty simple.

 The cable is intact and appears to have the correct plug.

 I am selling it as is as described.

National SAF-1 Select-O-Jet Audio Filter – Very Good Condition, UntestedRare original National Select-O-Jet (SAF-1) tunable audio filter! This 1950s accessory was designed to enhance selectivity on National receivers (NC-125, NC-183 series, etc.) by providing adjustable audio boost or nulling to reduce interference.Very good cosmetic condition. Untested – perfect for the restorer or collector completing a vintage National station.A cool piece of ham radio history!
 
 
The National Select-O-Jet (model SAF-1) is a vintage audio selectivity accessory produced by National Company in the 1950s. It was designed as an add-on for National receivers (such as the NC-125, NC-183, etc.) and other communications gear to provide tunable audio peaking (boost) or nulling (notch) for improved CW and voice reception in the presence of interference.
 
 
Key Information
  • Function: Tunable audio filter (peaking or rejection) using a bridged-T or similar circuit. It helps pull weak signals out of noise or QRM by emphasizing or attenuating specific audio frequencies.
  • Controls: Typically includes a frequency tuning knob and a mode/width switch (boost/null).
  • Connection: Plugs into the receiver's audio output; powered from the receiver or separate supply.
  • Era: Mid-1950s accessory for the National "Select-O-Jet" system.

 

Compatible National Receivers (Primary List)It was officially promoted for use with the following National models:
  • NC-125 — Most common pairing; the Select-O-Jet was heavily advertised with this receiver.
  • NC-183 and NC-183D
  • NC-173
  • NC-109
  • NC-88
  • NC-57 (and similar earlier models)
It can also work with many other tube-type communications receivers from National or other brands (Hallicrafters, Hammarlund, etc.) as long as they have a standard audio output jack (high-impedance or 500–8 ohm) and a suitable power take-off point. Performance is best on receivers with strong audio stages.Notes on Compatibility
  • It functions as an outboard audio filter (peaking or notch), so it is not receiver-specific in a strict electrical sense.
  • Best results are achieved with National receivers that have the matching accessory socket for easy integration.
  • Many owners also used it successfully with Drake, Collins, and other vintage gear.
This unit unit has the original cable or connectors, and it will plug right into compatible National models. For others, simple adapter cables are easy to make.
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