Donner 3500 Tube Layout
SHARE |
|
|
by Bill Degnan - 06/18/2009 22:52 |
There are 6 control boards in the Donner 3500, each has a set of tubes. This weekend I tested every one of the tubes, they all work. I used a Heathkit tube tester.
 Voltage Regulator card for the Donner 3500 analog computer. This card is inserted into the left most slot on the blue ribbon receptical bus back plane.
Viewing from the back of the unit with the door open: 1) left-most card is a voltage regulator, tubes from left to right: 6BR8 12AX7 12AX7 5651 CK-7044 12BH7A 2) The remaining 5 cards are the same, the tubes from left to right are: 6BR8 ECC 83 / 12AX7 ECC 83 / 12AX7 - NOT A TUBE (It's a relay) ECC 83 / 12AX7 6BR8 3) There are two tubes attached to the chassis to the right of the 6th card. The tubes in this space are both marked OB2 Reply |
|
Resources:
Popular Topics and FAQs
Past Issues:
Before we switched over to a blog format, past page archives here:
Vintage Computer Festival East 3.0 June 2006
Commodore B Series Prototypes July 2006
VOLSCAN - The first desktop computer with a GUI? Oct 2006
ROBOTS! - Will Robots Take Over? Nov 2006
Magnavox Mystery - a Computer, or? Jan 2007
The 1973 Williams Paddle Ball Arcade Computer Game Feb 2007
The Sperry UNIVAC 1219 Military Computer May 2007
VCF East 2007 - PET 30th Anniversary June/July 2007
The Electronic Brain August 2007
Community Memory and The People's Computer Company October 2007
Charles Babbage's Calculating Machine December 2007
Vintage Computing - A 1983 Perspective February 2008
Laptops and Portables May 2008
From Giant Brains to Hobby Computers - 1957 to 1977 August 2008
Historic Computer Magazines November 2008
World's Smallest Electronic Brain - Simon (1950) December 2008 - Feb 2009
Free Program Listings Spring 2009
Computer Music Summer 2009
Popular Electronics Jan/Feb 1975 - Altair 8800 Fall 2009
Early Microcomputer Mass Storage Summer 2010
3000 2
This image was selected at random from the archive. Click image for more photos and files from this set.