[Heath] PS-3 Power Supply

[Larry Sheldon]

On 10/21/2017 19:32, Wilson  Lamb wrote:
> I have just recovered a derelict PS-3 power supply.
> Interesting old circuit, with 1619 pass tubes.
> Does anyone know why they used the 1619, which is a 6L6 with no cathode, just filaments?
> Is there any reason 6L6s would not work, except for filament voltage?
> I have some 1619s coming, but inquiring minds want to know...
> WL

Cheaper to make by the cost of the cathodes and their installation?

-- 
"Everybody is a genius.  But if you judge a fish by
its ability to climb a tree, it will live its whole
life believing that it is stupid."

--Albert Einstein

 From Larry's Cox account.