Mcmaster: Created page with "JM: have assortment of bare tubes. Notably, my Ludlum 15 also has one as the alpha probe 300 px File:mcmaster_lnd_723_xetex_int_s..."

2019-03-09T06:46:54Z

Created page with "JM: have assortment of bare tubes. Notably, my Ludlum 15 also has one as the alpha probe 300 px File:mcmaster_lnd_723_xetex_int_s..."

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

[[File:mcmaster_lnd_723_86-36_side.jpg|300 px]]

[[File:mcmaster_lnd_723_xetex_int_side.jpg|300 px]]

[[File:mcmaster_lnd_723_ludlum_m15_img_6015.jpg|300 px]][[File:mcmaster_lnd_723_ludlum_m15_img_6025.jpg|300 px]]

[[File:mcmaster_lnd_723_tgm_side.jpg|300 px]]

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

= Specifications =

[http://www.lndinc.com/products/pdf/371/ 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 =

[[File:mcmaster_lnd_723_socket_0.jpg|300 px]][[File:mcmaster_lnd_723_socket_2.jpg|300 px]][[File:mcmaster_lnd_723_socket_5.jpg|300 px]]

[[File:mcmaster_lnd_723_ludlum_m15_img_6045.jpg|300 px]]

{| class="wikitable sortable" border=1
! # !! Size !! Function !! Note
|-
| 1 || L || N/C ||
|-
| 2 || S || V+ || 1M resistor to center
|-
| 3 || S || N/C ||
|-
| 4 || L || Ground ||
|-
|}

= Units =

{| class="wikitable sortable" border=1
!Case vendor !!Case model !!Tube vendor !!Tube model !!Works? !!Notes |
|-
| 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 =

[[File:mcmaster_lnd_723_86-36_side.jpg|300 px]]

[[File:mcmaster_lnd_723_86-36_front.jpg|300 px]]

Sample label:

LND, INC.
723
MADE IN USA
86-36

= Ludlum 44-7 unit =

From Ludlum M15 system

[[File:mcmaster_lnd_723_ludlum_m15_img_6034.jpg|300 px]][[File:mcmaster_lnd_723_ludlum_m15_img_6125.jpg|300 px]]

[[File:mcmaster_lnd_723_ludlum_m15_img_6015.jpg|300 px]][[File:mcmaster_lnd_723_ludlum_m15_img_6017.jpg|300 px]][[File:mcmaster_lnd_723_ludlum_m15_img_6025.jpg|300 px]]

[[File:mcmaster_lnd_723_ludlum_m15_img_6041.jpg|300 px]][[File:mcmaster_lnd_723_ludlum_m15_img_6045.jpg|300 px]][[File:mcmaster_lnd_723_ludlum_m15_img_6052.jpg|300 px]]

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 =

[[File:mcmaster_lnd_723_xetex_int_side.jpg|300 px]]

[[File:mcmaster_lnd_723_xetex_con.jpg|300 px]]

[[File:mcmaster_lnd_723_xetex_base1.jpg|300 px]][[File:mcmaster_lnd_723_xetex_base2.jpg|300 px]]

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 =

[[File:mcmaster_lnd_723_tgm_side.jpg|300 px]]

[[File:mcmaster_lnd_723_tgm_front0.jpg|300 px]][[File:mcmaster_lnd_723_tgm_front2.jpg|300 px]]

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 =

* http://www.lndinc.com/products/371/
* http://www.lndinc.com/products/pdf/371/

LND 723 - Revision history

Mcmaster: Created page with "JM: have assortment of bare tubes. Notably, my Ludlum 15 also has one as the alpha probe 300 px File:mcmaster_lnd_723_xetex_int_s..."