#7639
Peter Heembrock
Forum Participant

Check to see what AC input voltage is specified on the schematic or documentation you have…most older sets from the mid 30’s operated on 110 or 115VAC…not 125VAC that is available today…a higher than normal AC line voltage usually causes the B+ to be higher than normal…also weak tubes that draw less B+ current can allow the B+ to be high. Also if it is a set designed to operated on 25 or 60Hz and of course you are operating it today at 60 Hz that may also cause B+ to be a bit high…and new electrolytics that are higher in value compared to the original values will provide lower ripple and hence a higher average B+ voltage.

So hopefully one of these four areas may be causing a high B+ or a combination of them…

PH