Re: Big Daddy Vacuum Tube

To: tesla-at-pupman-dot-com
Subject: Re: Big Daddy Vacuum Tube
From: Parpp807-at-aol-dot-com (by way of Terry Fritz <twftesla-at-uswest-dot-net>)
Date: Tue, 24 Aug 1999 05:26:34 -0600
Approved: twftesla-at-uswest-dot-net
Delivered-To: fixup-tesla-at-pupman-dot-com-at-fixme

In a message dated 8/23/99 4:51:05 AM Central Daylight Time, tesla-at-pupman-dot-com 
writes:

<< Original Poster: "christopher boden" <chrisboden-at-hotmail-dot-com> 
 
 I have a giant 4-1000-A Tube, with 5 bottom pins and a nipple....
 
 Is it usefull for anything?
 How do I apply power to it just to make it glow (for pretty, not for 
 funtion)? >>

Chris,
The 4-1000A / 8166 is a real goodie.
It is a radial-beam tetrode good for a kilowatt output up to 110 mHz.
The thoriated tungsten filament needs a nominal 7.5 V -at- 20 A min to 22.7 A 
max.
Meter the fil voltage right at the terminals. Tungsten becomes very brittle, 
don't
shake the tube. Use a variac to heat the filament slowly. Thoriated tungsten 
filaments
must be operated at rated values if you power-up the tube.

pins
1-5..................fil
2-4..................grid 2
3......................grid 1

uses Eimac HR-8 plate connector and SK-500 forced-air socket

typical operation for one tube up to 110 mHz:

plate V............................5000 V
screen V........................  500 V
grid V.............................. -200 V
plate current..................  700 mA
screen current..............   147 ma
grid current....................     45 ma
plate diss.......................1000 W
screen diss...................     73 W
grid diss.........................       7 W

A 1991 price from Richardson Electronics is $895.
I would hold it with both hands.    :-))

Cheers,
Ralph Zekelman