On 2019/08/26 11:44 p.m., Phil Allison wrote:
John Robertson wrote:


Indeed, you need to know the tube value to be sure, but consider the
cost of batteries of the day and thus the B+ is likely 45VDC or thereabouts.

In those days some people made their own B+ batteries - way back when I
was a kid digging through attics in Toronto (mid 1960s) for old battery
sets I found a couple of home-made lead acid batteries that were glass
test tubes about 8 inches long mounted in a wooden box and there must
have been 15 to 20 in each case. Wish I still had them as they were
classic home-brew stuff which I always loved from the battery age of radio.



** The "battery age of (tube) radio" extended well into the 1960s.

Popular "portables" of that era used a pair of 45V packs for B+ and a large 1.5V dry cell for tube heaters - all made by "Eveready".

Miniature 7 pin tubes like the 1S4 and 1R5 were used - along with a transformer supply for home use with a multi-finned selenium rectifier.

https://www.radiomuseum.org/tubes/tube_1s4.html



...... Phil


Yeah, but I was talking about the time when the primary home radio was a
battery set - prior to battery eliminators and the like...

I have a lovely (well, it was lovely at one time, the case needs all new
leather) Radiola 24 which was an early 'portable' radio in my small
collection. About the size of carry-on luggage these days. Cunningham
C-299 tubes...

John :-#)#