Brand New, MINT in Original Boxes, Rare August 1963 Production Tungsram Industrial Grade ECC83 12AX7 Welded Plate Tubes with non-corrosive alloy pins. Each tube has individual serial number in RED. All tubes from the same date/batch code T9 = August 1963. Click LARGER PHOTO to see the 1960s Bulk Box these came in with old style logo. Made in Hungary.
These one of a kind early 1960s Tungsram tubes with welded plates are obscure and the best example of Tungsram tubes. Typical physical differences between the 1950s-1960s Tungsrams v/s 1970s production:
- Etched ECC83 towards the top of the glass bottle in 1950s-1960s Tubes
- Some 1960s tubes have Caramel as well as Silver colored flashing.
- Non-corrosive Alloy Pins v/s Regular Pins
- Welded
Plates v/s Crimped Plates
Tungsram made some of the finer tubes in Eastern Europe due to its exposure to subsidiaries in Gt. Britain and Austria.
Industrial grade tubes were subject to rigorous test and burn in process. These tubes were produced in limited quantities (between 5000-10000 tubes according to Zeitmann from Hungary). Tungsram ECC83 tubes are well liked by many Audiophiles and Guitar folks.
Tested and matched on Top of the Line Calibrated
Hickok 580 Lab Grade Tester recently calibrated by late Chris Haedt. 65% = 1000 mmhos on this tester for ECC83/12AX7.
Price = $100 PER TUBE.
Price is high because Tungsram ECC83 Industrial tubes in NOS/NIB condition are nearly extinct. If you select 2 tubes, we will send you a matched pair, 4 tubes for matched quad and so on.
Tubemonger and Tungsram 
