|
|
|
#1
04-08-2018, 01:36 PM
|
||||
|
||||
|
Hey Zeno !
 Remember these ? I photographed the back so folks could see that these were "punch cards" , a technology that most under 50 may not be familiar with , unless of course they have one of RCA's "cardmatic" tube testers . For those who've never seen one of these cards , this is how a TV shop would order the tubes it needed , with a different card for each tube type . This card was ordering five 3AT2B tubes as indicated at the top left corner of the card . 
|
|
|
Threaded Mode