LND 723

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JM: have assortment of bare tubes. Notably, my Ludlum 15 also has one as the alpha probe

Mcmaster lnd 723 86-36 side.jpg

Mcmaster lnd 723 xetex int side.jpg

Mcmaster lnd 723 ludlum m15 img 6015.jpgMcmaster lnd 723 ludlum m15 img 6025.jpg

Mcmaster lnd 723 tgm side.jpg

"all end-window LND probes are known to violently vaporize themselves into oblivion if overvolted(including spikes)"


Specifications

Source

  • Recommended anode resistor (meg ohm): 1
  • Maximum starting voltage (volts): 800
  • Recommended operating voltage (volts): 900
  • Operating voltage range (volts): 850
  • Maximum plateau slope (%/100 volts): 10
  • Minimum dead time (micro sec): 150
  • Gamma sensitivity Co60 (cps/mr/hr): 40
  • Tube capacitance (pf): 3
  • Weight (grams): 150
  • Maximum background shielded 50mm Pb + 3mm Al (cpm): 50


Socket

Mcmaster lnd 723 socket 0.jpgMcmaster lnd 723 socket 2.jpgMcmaster lnd 723 socket 5.jpg

Mcmaster lnd 723 ludlum m15 img 6045.jpg

# Size Function Note
1 L N/C
2 S V+ 1M resistor to center
3 S N/C
4 L Ground


Units

Case vendor Case model Tube vendor Tube model Works?
XETEX LND 723 86-36 No Outgassed before I got it
XETEX LND 723 86-36 Yes? looks okay but untested
LND 723 88-13 No M15 original tube. Outgassed during calibration
TGM No accidentally popped
TGM? Yes into M15?

LND unit

Mcmaster lnd 723 86-36 side.jpg

Mcmaster lnd 723 86-36 front.jpg

Sample label:

 LND, INC.
 723
 MADE IN USA
 86-36

Ludlum 44-7 unit

From Ludlum M15 system

Mcmaster lnd 723 ludlum m15 img 6034.jpgMcmaster lnd 723 ludlum m15 img 6125.jpg

Mcmaster lnd 723 ludlum m15 img 6015.jpgMcmaster lnd 723 ludlum m15 img 6017.jpgMcmaster lnd 723 ludlum m15 img 6025.jpg

Mcmaster lnd 723 ludlum m15 img 6041.jpgMcmaster lnd 723 ludlum m15 img 6045.jpgMcmaster lnd 723 ludlum m15 img 6052.jpg

Original socket badly corroded. Repaired socket with cleaning + solder dip. However, ultimately the tube also had to be replaced

1M resistor in series on center + pin

Original tube degradation:

  • Worked after cleaning
  • Shipped to Ludlum for service
  • Ludlum reported the tube wasn't reporting correctly
  • Shipped back to me
  • Tube unresponsive. Vacuum window noted no longer taught

XETEX unit

Mcmaster lnd 723 xetex int side.jpg

Mcmaster lnd 723 xetex con.jpg

Mcmaster lnd 723 xetex base1.jpgMcmaster lnd 723 xetex base2.jpg

These have some sort of support electronics, leading to a 4 wire CMC connector instead of a typical coaxial connector

Sample data plate:

 MADE IN USA
 SERIAL NO. 020969
 XETEX, INC.
 Mountain View, CA

Other unit is S/N 020967

TGM unit

Mcmaster lnd 723 tgm side.jpg

Mcmaster lnd 723 tgm front0.jpgMcmaster lnd 723 tgm front2.jpg

Looks identical to my 723 88-13, so assuming its LND

Data plate:

 TGM DETECTORS INC.
 34 Bear Hill Road
 WALTHAM, MA 02154
 N210 S/N 3585

References