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LOEWE 3NF MULTI-VALVE - THE FIRST INTEGRATED CIRCUIT

ANTIQUE RADIO VACUM TUBE VALVE LOEWE 3NF

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Price:US $2,000.00
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Item location: Miami, FL, United States
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Seller assumes all responsibility for this listing.Item number: 160537974655
Last updated on Jan 08, 2012 22:17:51 PST View all revisions

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Loewe 3NF Multi-valve - The first integrated circuit

 

A Loewe 1931 vacuum tube (possibly the 3NF or a similar model) that integrated multiple functions in a single tube, a predecessor to the integrated circuit.

The Loewe 3NF was an early attempt to combine several functions in one electronic device.
Produced by the German Loewe AG company as far back as 1926, the device consisted of 3 triode valves (tubes) in a single glass envelope together with all the fixed capacitors and resistors required to make a complete radio receiver. The resistors and capacitors had to be sealed in their own glass tubes to prevent them from contaminating the vacuum.

One of the reasons for the development of this amazing device was that in Germany, there was a tax on receivers based on the number of valves in the set, so in 1926, Loewe Radio A.G introduced the 3NF, and also another multi-valve, the 2HF, which contained  two screen-grid tetrodes, two resistors and a capacitor, intended for use as a two-stage RF amplifier.
The only other parts required to build a Radio receiver were the HT and LT (A and B) batteries; the tuning coil; the tuning capacitor and the loudspeaker. The device was produced not to enter the Integrated circuit era several decades early, but to evade German taxes levied on a per valveholder basis. As the Loewe set had only one valveholder, it was able to substantially undercut the competition.

The original Loewe multi-valves are masterpieces of glasswork, which must have been very expensive to manufacture, so later versions used a mica supports, and the glass was given an aluminium outer coating to hide the less elegant internal structure.
 
The printing on these tube are faded (see photos) since it is over 85 years old.
I read somewhere on the Internet that inscriptions and logos on some old tubes fade easily.
In some cases, just by cleaning other tubes I accidentally erased the inscriptions on them, so it is perfectly normal that they have faded over time.

The filament was checked and is in good condition.
Last 3 pictures just added are from actual check. (Dark background)

Click here for HD pictures of these filaments being succesfully tested:
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For sale only the valve (Blue background pictures and close ups) the other 3 pictures are illustrative

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NOTE:

Please bear in mind that this item WILL NOT ship immediately to the buyer / winner. Shipment will be done within 7-10 business days after this purchase / order is placed.


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SHIPMENT:
I take extra care in the packing  which is sent packed VERY securely for its protection and cushioned in foam chips, thus ensuring a safe journey! NO extra charge is levied for this service.


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Seller assumes all responsibility for this listing.

Shipping and handling

Item location: Miami, FL, United States
Shipping to: Worldwide
 
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