PMT Help/Information.

Scintillation crystals, PMTs, voltage dividers etc...
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James Luck
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Joined: 10 Oct 2019, 04:16
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PMT Help/Information.

Post by James Luck » 28 Nov 2021, 19:17

Hello all,

As one who frequents Ebay quite often i found a deal I couldn't resist, but now its coming back to bite me.
I came across some Hamamatsu photomultiplier tubes that was new old stock and relatively cheap, couldn't resist buying and stocking up. Although I haven't been able to find a definitive Spec sheet for them. I originally thought they were gonna be like my go to small PMT's P/N: R1166p, although i was mistaken.

These are the same sized as the Hamamatsu R1166p and appear to share the same window type.
size: 19x90ish mm.

The unknown PMT type is P/N:6812241 on box.

I have been unsuccessful at pulling any good documentation on them. closest i got was a sheets saying the unknown type shares the same pinout as the R1166p. After asking around i got mixed information from others that all seem to point to people making assumptions that these are just rebranded R1166p's.

I did hook two up with a 10Mohm divider chain and started at 300v then worked my way up to 1200v while using a BC412 block and a cesium source to try and test its preferred voltage, but i never received any counts. which makes me suspect that either these do not share the same pinout, or that i got a bad batch, although as for vacuum tubes and even PMT's they appear to be fine. I did have one send a signal in a vary brief test where i used a UV lamp to test its sensitivity to UV light but of course long duration it bad, and at that point i was irritated and didn't mind risking killing one.


well any help locating documents on them or trouble shooting will be appreciated, take care.
James luck
Chicago Ill, USA.
Hobbyist, primary meter: refurbished GR-135 & Ludlum 9.
Mostly detection than identification.

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