05-29-2020, 01:51 PM
https://www.radiomuseum.org/tubes/tube_84.html
This is the datasheet in a nutshell.
The 40uF value is max cap.
Also it raises the B+ voltage.
As Terry said, 12uF is not standard today.
I use 2x22uF 450V in series, that yields 11uF. 20uF is ok too.
As for bringing up radios without recap, the only reason for it is to validate the power transformer.
You could do it by pulling the rectifier tube (and you might choose to pull the rest but not necessary)
and then measuring the high V AC at where the plates of it go in the tube panel, and heaters low Vs.
I see no reason to power fully populated radio otherwise before recap.
This is the datasheet in a nutshell.
The 40uF value is max cap.
Also it raises the B+ voltage.
As Terry said, 12uF is not standard today.
I use 2x22uF 450V in series, that yields 11uF. 20uF is ok too.
As for bringing up radios without recap, the only reason for it is to validate the power transformer.
You could do it by pulling the rectifier tube (and you might choose to pull the rest but not necessary)
and then measuring the high V AC at where the plates of it go in the tube panel, and heaters low Vs.
I see no reason to power fully populated radio otherwise before recap.
People who do not drink, do not smoke, do not eat red meat will one day feel really stupid lying there and dying from nothing.
![[-]](https://philcoradio.com/phorum/images/bootbb/collapse.png "[-]")
