ChuckA
07-28-2003, 06:16 PM
Did anyone else follow this auction?
Item # 2183754833
It was listed as a 12 AP4 CRT, but sure looks like a 12LP4, and it closed at a mind boggling $517. A bargain if it was a 12AP4.
I emailed the seller and explained it wasn't an AP4 and sent a picture of the real thing, of course no response. I wonder how long it will take the buyer to realize he bought the most expensive 12LP4 in history.
Chuck
Eric H
07-28-2003, 06:55 PM
Well it does say 12AP4 on the base cap.
Is the 12AP4 a Pre War tube?
ChuckA
07-28-2003, 07:15 PM
Eric,
No idea why the it's labeled that way. The 12AP4 was used on most of the 12" pre war sets. Notice the HV connection near the neck of the tube. Here's a picture of the real thing:
Chuck
Eric H
07-28-2003, 07:54 PM
Obviously different!
The seller says "Came from an old repair shop where it was found in an RCA 12LP4-A box."
So that's probably what it actually is unless there were two different tubes with the same number pre and post WW2?
Interesting thing is that buyer bought the pre war Andrea a while back so you would think he knows what he's doing?
wvsaz
07-29-2003, 12:54 PM
The 12AP4 was sometimes labeled as 1803-P4.
Steve McVoy
08-06-2003, 06:32 AM
The tube was rebuilt, and my guess is that the new base they put on was mis-labeled.
ChuckA
08-06-2003, 06:41 AM
Hope the buyer caught it before paying and getting it.
Steve McVoy
08-06-2003, 06:45 AM
I wrote to the buyer and the two underbidders to warn them.
wvsaz
08-06-2003, 06:26 PM
The 12AP4 has a medium 6 pin base (like those on old radio tubes) and a 2.5 volt filament. The tube shown on eBay has a 12 pin duodecal base, which was introduced after WW2 in 1946.
The below site has a 12ap4.
http://www.tv-forums.com/forum/TV_Equipment_C4/TV_Repair_Forum_F3/12ap4_tube_and_whats_so_special_about_it_P2635/