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Vintage RARE 1930's / 40's Universal KO crystal microphone Hi Z harp mic w cable PROP

Vintage RARE 1930's / 40's Universal KO crystal microphone Hi Z harp mic w cable PROP

£253
Price dropped from £253
Very GoodReverb16d ago

Sold by

T

The House of Chrome

View on Reverb

Details

First Seen
24 October 2026
Last Seen
10 November 2026
Times Seen
26

About this listing

Vintage RARE 1930's / 40's Universal KO crystal microphone Hi Z harp mic w cable PROP is a used item in very good condition, listed on Reverb. The asking price is £253. It is offered by The House of Chrome through Reverb. It is in our Microphones category. Used Gear Hunter first saw this listing on 24 October 2026 and last saw it on 10 November 2026. It has been seen 26 times in our scans. Prices are converted from the seller's currency when we scan the listing, so the amount you pay may differ slightly. The seller sets shipping, and import duty or VAT may apply, so check the final cost and the item's details on Reverb before buying.

From the seller

Hello and welcome to the House of Chrome. Here's a unique and rare microphone that very rarely comes around from the late 1930's and happens to make one of the most desirable harp mics out there today. You are looking at an excellent working Universal KO model crystal microphone with the omni-directional high impedance setting that has an all metal construction with a bronze finish. This mic was originally sold in the mid 1930's to the mid 1940's before being discontinued but this is the unique KO model. It comes with the original cable in which to operate. That being said the mic is 100% complete but no longer works as the crystal element stopped working decades ago. This mic was virtually identical to the 15 MM series. The KO had the attached cable as where the 15 MM series had the detachable cables. Pic # 2 shows the KO model in a 1940's era Universal catalog along with it's basic characteristics. The KO & 308 was a general purpose mic that could be used for broadcasting, recording and even singing if need be but again, it's an excellent choice if you use a harmonica as it's lite weight, easy to cup and has a strong, clear tone that's dirty and muddy in nature. Again, the mic is currently non-working. The mic is actually made from a brass. It's a solid mic with deco vibes and makes for an amazing harp mic due to it's smaller size and easy in which to cup in the hands. A Shure C.M or C.R element would fit nicely in the mic and would be a fairly easy install. The crystal element is original as seen in pic # 3. I've only ever come across 2 of these mics over the past 15 years. These mics are quite rare. Universal was one of several American microphone companies that existed from the 1930's to the 1950's when they finally went under but they manufactured some of the finest and most interesting mics ever made. They were base out of California originating in Inglewood but moved to L.A in the early 1940's and eventually moved to Pasadena in the early 1950's. A high quality company that left it's mark but just couldn't keep up with the heavy hitters like Electro Voice and Shure Brothers as the years went by. Very few mic companies could. As you can see there are typical lite signs of wear on the bronze finish. Small spots of discoloration here and there but the overall finish has a nice patina and the mic is free of any dents or deep scratches. The front inner cloth screen is free of any odors or holes but there is a slight rip on the upper right side. The mic is solid. No loose parts and everything is where it should be. Even the label looks excellent. The threading for the stand and cable is perfect. This mic will screw onto any desk or floor stand you have as well. I would rate the true cosmetic condition of this microphone a 7 on a scale of 1 - 10 You'll notice that the mic comes with the original cable. It's still soft and pliable despite being almost 80 years old. 8 feet gives you a bit of reach to work with as well. The cable has the detachable male 1/4 inch end connector. The mics cable has zero issues so a new element would have this mic up and running in no time at all. This KO will make a fabulous addition to your mic collection even if you decide not to mod it with something new. MICROPHONE STAND SHOWN IS NOT PART OF THIS SALE...USED FOR DISPLAY PURPOSES ONLY. As with all my items for sale... I can promise you will be happy with it for the price paid. If not...I have a no hassle return policy. The shipping will be on you as I believe that's fair but the purchase price would be refunded. Simply return in the same nice condition...period. Check my rating. INTERNATIONAL BUYERS are welcome as well. Buyer must pay within 24 hours or an unpaid case will be opened due to too many unpaid mics lately. Domestic buyer will get priority shipping. If you have any questions feel free to ask and...thanks for looking.