Forums :: Resources :: Features :: Photo Gallery :: Vintage Radio Shows :: Archives :: Books
Support This Site: Contributors :: Advertise


It is currently Oct Sat 21, 2017 3:53 am


All times are UTC [ DST ]





Post New Topic Post Reply  [ 9 posts ] 
Author Message
 Post subject: 2AP1A
PostPosted: Oct Fri 13, 2017 4:48 am 
Member
User avatar

Joined: Jan Mon 24, 2011 7:21 am
Posts: 444
Location: saint clair shores, michigan
Found this at an estate sale with literally a ton of electronic stuff. I couldn't pass it up for 2 dollars. Looks to be NOS, in it's original box and packing. What was the main use for these? Scopes? Seems too small to have almost any discernable image. While I'm not looking to just sell it for a profit, what would this tube, in this seemingly unused shape, be worth?


Attachments:
2AP1A.jpg
2AP1A.jpg [ 52.86 KiB | Viewed 286 times ]

_________________
Invisible airwaves crackle with life
Bright antennae bristle with the energy - The Spirit of Radio
Top
 Profile  
 
 Post subject: Re: 2AP1A
PostPosted: Oct Fri 13, 2017 5:29 am 
Moderator

Joined: Jan Thu 01, 1970 1:00 am
Posts: 35973
Location: Livermore, CA
Nice 2" scope tube. Yes, it can be used in scopes or as a tuning indicator.

For value check here:

viewtopic.php?f=19&t=201537

Here are a couple for sale:

https://www.ebay.com/sch/i.html?_nkw=2+crt+2ap1

_________________
Norm


Top
 Profile  
 
 Post subject: Re: 2AP1A
PostPosted: Oct Fri 13, 2017 10:56 am 
Member

Joined: Sep Tue 30, 2014 6:08 am
Posts: 1895
Location: The Old Dominion 23518
Build a scope:

http://www.americanradiohistory.com/Arc ... 950-02.pdf

Page 30 has the project.

Solid State version:

http://www.americanradiohistory.com/Arc ... 972-02.pdf

Again, page 30 starts the article - follow the PDF index, not the volume page numbering...

_________________
Brian
"Capacitor Cosmetologist since 1979"
USN Retired (Avionics)


Top
 Profile  
 
 Post subject: Re: 2AP1A
PostPosted: Oct Fri 13, 2017 5:42 pm 
Member

Joined: Aug Thu 20, 2015 3:09 pm
Posts: 489
Location: Albion, CA, USA
My Hallicrafters SP-44 Panadapter uses that tube. There are a few other applications. IIRC, I bought one for $15 a couple of years ago.


Top
 Profile  
 
 Post subject: Re: 2AP1A
PostPosted: Oct Fri 13, 2017 5:46 pm 
Member
User avatar

Joined: Mar Tue 22, 2016 12:51 am
Posts: 139
Location: Creswell, OR.
It'd be a nice size for a little impedance curve tracer display, or other basic X-Y displays.

- Scott


Top
 Profile  
 
 Post subject: Re: 2AP1A
PostPosted: Oct Sat 14, 2017 4:07 am 
Member
User avatar

Joined: Feb Sun 05, 2012 5:12 pm
Posts: 529
Location: Syracuse NY
I built a TV with a 2AP1A:
Attachment:
hbtv1.jpg
hbtv1.jpg [ 70.52 KiB | Viewed 176 times ]


Bob

_________________
Life is too short to be serious all the time.


Top
 Profile  
 
 Post subject: Re: 2AP1A
PostPosted: Oct Sat 14, 2017 7:41 am 
Member
User avatar

Joined: Sep Mon 16, 2013 2:42 am
Posts: 2339
Location: Tucson, Arizona U.S.A.
Some of the oscilloscope kits that came with correspondence courses in the '50s used that tube. I have one of them with only 4 tubes: 6SJ7, 6SN7, 5Y3, and 2AP1. They can run on surprisingly low voltage.

_________________
Jim Mueller


Top
 Profile  
 
 Post subject: Re: 2AP1A
PostPosted: Oct Sat 14, 2017 2:38 pm 
Member

Joined: Jan Thu 01, 1970 1:00 am
Posts: 801
Location: Philadelphia, PA
There were a number of commercially made 2" scopes made.
Here are a few 2" scopes from my collection:

Image
National CRU

Image
National CRUP

Image
RCA 151-2

Image
Deforest Training Kit

Image
UTL Training Kit

Image
Homebrew

Image
Supreme 530

Image
Supreme 535

Image
Philco 7019

_________________
Chuck

http://www.myvintagetv.com


Top
 Profile  
 
 Post subject: Re: 2AP1A
PostPosted: Oct Sat 14, 2017 3:48 pm 
Member
User avatar

Joined: Jan Thu 01, 1970 1:00 am
Posts: 11288
Location: S. Dartmouth MA 02748-1225 USA
As a boy I found a 2AP1 in a surplus shop for $2. I taught myself how a scope works by building a breadboard scope. Nothing fancy, didn't have a socket so I soldered to the pins. Project has long gone but saved the transformer, choke and the tube...

I now have several RTTY tuning units that use the 2AP1.

Handy for a modulation indicator, even a sweep analyzer...

Worth? Dunno, look at past auctions on ebay...

_________________
There Are None So Blind As Those Who Will Not See: John Heywood, 1546


Top
 Profile  
 
Post New Topic Post Reply  [ 9 posts ] 

All times are UTC [ DST ]


Who is online

Users browsing this forum: No registered users and 7 guests



Search for:
Jump to:  




















Privacy Policy :: Powered by phpBB