Raco "Super-Clipper"
Radio Constructors Labs.
136 Liberty Street
New York, New York, USA

Tube Line Up:
6K7M...1st. R.F. Amplifier
6K7M...2nd. R.F. Amplifier
6K7M...Ultra High R.F. Amplifier
6L6G...Audio Output.

Height...24.5 inches
Width...17.25 inches
Depth...10.5 inches

Frequency Ranges:
BC Band...550 kHz - 1400 kHz
P Band...1.3 MHz - 3.2 MHz
SW 1 Band...2.75 MHz - 7 MHz
SW 2 Band...7 MHz - 20 MHz
Ultra High Frequency Band

Power Source:
AC...110 Volts

Click here to view, by means of TerraServer, the location of the Radio Constructors Labs. company. The origional building the housed the company no longer exists.

Click here to read an interisting AWA artical about the Raco Super-Clipper.

Short Wave & Television, February 1938
Page 569

Operating Instructions


    The SUPER - CLIPPER must be used on 110 to 120 volt A.C, only. After plugging the line cord into your power outlet the receiver is turned "ON" or "OFF" by means of the switch knob just below the speaker.

    The four calibrated bands on the large main dial correspond to the four numbered positions on the two band-switches on the lower left control panel. Number one band is the broadcast band across the top of the dial; number two band is immediately below it, etc., the bottom being number four. The pointer of the large dial should be set on the frequency of the station desired and then the bandspread dial (center of panel) should be slowly tuned with the left hand while the regeneration control is adjusted with the right hand. Regeneration increases as the regeneration control is moved to the right. If it is carried to the right too far it goes beyond the point of maximum sensitivity and the detector tube goes into oscillation causing whistles to be heard whenever a station is tuned in. This condition can be used as a convenient station finder for weak signals which otherwise might be passed over.

    The signal booster is cut out of the circuit by moving it's band control switch to the "off" position. When it is in use it's switch must always be on the same number as the regular bandswitch. The chief purpose of the signal booster or preamplifier, as it is called, is to improve the reception on weak foreign short wave stations. On strong signals and local long wave reception it is best to cut it out of the circuit.

    The TRIMMER control - located between the two bandswitches - serves two purposes It provides proper antenna impedance match at different frequencies, giving maximum signal pickup, and it also acts as a selectivity control, giving sharper tuning as it is turned to the right. It is a compression type condenser and accordingly may be turned completely around two or three times over it's entire adjustment range. Do not try to force it however at it's extreme ranges where it begins to turn hard.


    Inside of the receiver there is a small bakelite sub-panel on which are mounted three pin-jacks - two red and one black - and another compression type isolantite condenser. The latter is mounted below the chassis base with it's slotted shaft, for screw driver adjustment, extending above. This condenser is used chiefly to adjust the calibration on the broadcast band. It is properly adjusted at the factory and need not be touched. If it is desired to tune to frequencies higher than those indicated on the main tuning dial, super-regeneration and the special plug-in air-coils must be used as follows: -
    Remove the short wire jumper, which is always inserted between the rid and black pin-jacks for the lower calibrated frequencies and insert the ends of one of the air-coils in the two red pin-jacks. Three ultra high frequency air-coils are furnished (others can be easily wound from #14 or #16 hard drawn copper wire for experimental purposes). The largest coil includes the amateur and police bands in thee neighborhood of ten meters; the medium sized coil covers the seven to eight meter ultra high frequency broadcast and television bands, while the smallest coil is for the five meter amateur band.
    Turn the preselector switch to the "OFF" position and place the band switch on the "SUPER REGEN* position. The main tuning dial should be turned to the high frequency end of the scale (where the plates are out of mesh) and left there as it is not used for super-regenerative tuning. Retard the volume control until a loud hiss is heard. The detector is now super regenerating and stations can be tuned in with the bandspread condenser which now does all the tuning.


    Two antenra4onnection positions are provided on the back of the chassis. The one on the right (looking at the set from the rear) is for any standard aerial although we do NOT recommend special doublets for all-wave reception. We advise a plain single wire L type antenna; from 50 to 150 feet in length and as high as possible. The left hand antenna connection is for ultra high super-regenerative reception so that separate special antennas may be used for these short waves below ten meters. However, the regular antenna may be connected here for this high frequency work, if desired, with reasonably good results.
The "GROUND"' post (marked G) need not be connected at all if a straight antenna is used. It is well however to try a ground connection as, under some conditions, it improves reception - particularly on #1 band.


    The bandspread condenser, which is controlled by the center dial, may be adjusted to give any degree of bandspread desired by simply bending the fixed and moveable plates further apart. The greater their separation the greater the bandspread will be. The present adjustment is correct for average reception but for special amateur phone or CW reception greater bandspread is desirable.

    This is an example of the the Haynes R-S-R Clipper which uses the same circuit as the Super-Clipper minus the two stage switchable RF front end.  I found this photo on ebay some time ago.

This web page was last updated: March 25, 2007