[Heath] PS-3 Power Supply

[Fred]

It was cost. 1619 tubes were very cheap, maybe 25 cents surplus.  Seeburg Corp who made jukeboxes was running short of the four 6V6 tubes for their jukeboxes due to the Korean war using the available 6V6s in 1951 so they ran a production run of modified amps using four 1619’s with a 2.5 volt filament transformer for the filaments.  Most early 50’s Heath equipment used WWII surplus parts. 

Fred WA3KIO

Sent from Mail for Windows 10

From: Larry Sheldon
Sent: Saturday, October 21, 2017 9:34 PM
To: heath at puck.nether.net
Subject: Re: [Heath] PS-3 Power Supply



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.
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