Coil - Miniature adjustable coil, 70, oscillator
Coil is similar to Miller number 70-OSC oscillator coil. Their small physical size and the fact that they can be adjusted to the inductance required make these coils ideally suited for replacement in broadcast band receivers. The 70 Oscillator coil has a primary and a tapped secondary. These coils are for use in all common padded and unpadded oscillator circuits.
Specification Sheet:
| Frequency Range | 540 Hz - 1,600 KC | |
| Intermediate Frequency (I.F.) | 455 Kc | |
| Resistance, lug 1 to 2 | 5 Ω | |
| Resistance, lug 1 to 3 | 6.2 Ω | |
| Resistance, lug 4 to 5 | 2.5 Ω |
| Packaging Dimensions | 3.3 in. × 1 in. × 1 in. | |
| Weight (Packaging) | 0.02 lbs. |
 Specification Sheet | All Models |
My Project Lists
Specifications, Files, and Documents
Questions and Answers
Click each question to see its answers.
2 answers
I'm in need of a 5 lug coil, the IF=456 on mine this is for a D-726 Truetone. The old coil has no ID number.
Asked by markladams on July 29th, 2016.
August 2nd, 2016
Staff Member
This is a 5 lug coil with a I.F. of 455 kc. It will work in an application that calls for these specifications.
I have used one of these oscillator coils on a Silvertone console with an I.F. frequency of 175 kHz with fantastic results.
1 answers
What is the allen key size is required to adjust this coil?
Asked by Anonymous on February 9th, 2017.
February 16th, 2017
Staff Member
You will need tool # 9440 from our Alignment Kit. Do a search for SKU: S-T18-530.
1 answers
The coil I need to replace is a four lug coil from a Grantline radio.
Is there a way to make this five lug coil work in it's place ?
Asked by junkman on March 8th, 2020.
March 12th, 2020
Staff Member
This coil has a tap on the #2 lug. This is not always used. Please see the spec sheet above for diagrams showing use without this tap.
1 answers
What is the red dot for on the coil?
Asked by Anonymous on August 9th, 2020.
August 10th, 2020
Staff Member
The red dot is simply used to orient what number lug each lug is.
0 answers
What is the Inductance range??
Product Reviews
This product ;looks like what we called a " Vari loop stik" back in the 50's. I worked on a fire lookout (108 ft. tower) and my old Philco portable radio died so I used one of these and a crystal ("cats whisker") for a tuner and fed that into the final amplifer of the Philco so that I didn't need too use earphones.
The new coil was placed in a Philco 38-12 receiver. The original coil opened the first time the set was powered due to the oxidation of shellac used to cover the turns back in 1938. The new coil worked perfectly.
Just the right thing for restoring old radios that have damaged coils.
The tuning slug allows you to adjust the inductance which can vary with radio brands.
After searching high and low for a suitable replacement for the old unobtanium Heathkit part 40-588, I settled on trying the P-C70-OSC. This coil was needed to work as a local oscillator to feed a mixer and convert the 455 KHz IF of a receiver to the 350 KHz IF of the HO-13 Panadapter. It worked the first time I applied a test signal. Just had to adjust the slug to center the pip.
Haven't put it in yet,but it arrived promptly & well packaged.Great Company to deal with.
Worked perfectly on a 1950s AA5 radio with 12BE6 tube.
Use the ferrite slug to adjust the low end of the dial.
Then use the oscillator trimmer on the ganged capacitor for the upper end.
Was able to achieve perfect tracking.
Worked on a 1937 radio
Exellent gain, this osc. coil works good in Am/mw mini transmitters as well as being a good coil for regenerative radios.
Mice got to the oscillator coil in a Magnavox CR-216 chassis. Used this as a replacement and it worked just fine. No trouble with alignment.
All of the products I have bought over the years have always been top notch, work as expected and has the right value.