23-05-2024, 06:17 PM
(This post was last modified: 23-05-2024, 06:19 PM by Mike Watterson.)
Yes, the normal limits are +/-10% though -10% greatly increases life and +10% decreases it. The 15V is a reduction of 6.25 %.
But what tolerance is the 15V? It should be greater than 14.4V which is -4% on 15 V
Everything varies and has a range.
However likely a PCL82 would work of a 12V lead acid, which is about 10.8V (below that damages the battery to a smidge above 14V fully charged, which is why a bench PSU for 12V battery gear is a nominal 13.8 V.
Reducing the heater voltage slightly reduces gain and gradually limits the maximum anode current.
Really only excess heater voltage will damage a valve, a somewhat reduced voltage where it still "goes" doesn't harm it.
But what tolerance is the 15V? It should be greater than 14.4V which is -4% on 15 V
Everything varies and has a range.
However likely a PCL82 would work of a 12V lead acid, which is about 10.8V (below that damages the battery to a smidge above 14V fully charged, which is why a bench PSU for 12V battery gear is a nominal 13.8 V.
Reducing the heater voltage slightly reduces gain and gradually limits the maximum anode current.
Really only excess heater voltage will damage a valve, a somewhat reduced voltage where it still "goes" doesn't harm it.
