REF150 Tube Bias is increasing!?
What kind of meter are you using? 65 mV is a pretty low voltage, so you’ll need at least a 3 1/2 digit multimeter with a 200mV or 300mV range.
A good meter will operate correctly independent of battery voltage and then provide a clear indication that the battery is low and needs to be replaced.
I use a TPI 183 - good value. Fluke also makes a good multimeter.
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Main System:
Amati Futura Mains
Amati Homage VOX Center,
Proac Response 1sc Rears,
Three MC2301's for L,C,R
MC 602 for the rears
C 1100, MX 151, MCD 1100, MR 80
Nottingham Dais with Wave Mechanic
Sumiko Palo Santos Presentation
SurfacePro 3, RPi 4, ROON, WW Starlight Platinum USB, Schiit Yggdrasil, Benchmark DAC3 HGC
MX 151, OppO BDP-95, JVC RS-500 DILA projector, 106" diagonal Stewart Luxus Screenwall Deluxe with Studiotek 130 G3 material.
Lake House:
Ohm F, MC 275V, C2300, MR 77, Rega P3
OnDeck:
McIntosh MAC 4300v
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