[Heath] PS-3 Power Supply

[Kenneth G. Gordon]

On 21 Oct 2017 at 20:32, 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?

1619s were extremely inexpensive at the time. Far less expensive than 6V6s or 6L6s. The 
military had millions of 1619s made, and there were tons in surplus.

Ken W7EKB

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