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FERNSEH · 1st Jun 2021, 11:06 am

Replaced R66 this morning. Improved contrast ratio but there's no getting away from the fact the CRT has low emission. Tube heaters are slightly underrun with 6.18V measured across pins 1 and 8.
So do I give the tube a boost? Nothing to loose but only solution really is find another tube. Never going to find a 23SP4, it was unobtainable in late sixties and the recommended replacement was the Mazda CME2306 or Brimar A59-13W. All three are bonded faceplate tubes.
An alternative is the Rimband III A59-23W.

DFWB.

1st Jun 2021, 11:06 am	#26
FERNSEH Dekatron Join Date: Mar 2005 Location: Gateshead, Tyne and Wear, UK. Posts: 7,444	Re: HMV 1920 made in 1960. Replaced R66 this morning. Improved contrast ratio but there's no getting away from the fact the CRT has low emission. Tube heaters are slightly underrun with 6.18V measured across pins 1 and 8. So do I give the tube a boost? Nothing to loose but only solution really is find another tube. Never going to find a 23SP4, it was unobtainable in late sixties and the recommended replacement was the Mazda CME2306 or Brimar A59-13W. All three are bonded faceplate tubes. An alternative is the Rimband III A59-23W. DFWB. Last edited by FERNSEH; 1st Jun 2021 at 11:27 am.