[Jukebox-list] Seeburg DS160 tube?

[Bob E.]

At 07:29 PM 9/4/07 -0700, you wrote:
>I have a Seeburg DS160 with the "scans twice but won't select" problem. 
>I've gone through the troubleshooting guide tests, with the result 
>(according to the guide) that it's either the pulse amplifier tube 
>(12AX7) or the pulse amplifier itself. Thought I'd start easily (and 
>less expensive) with the tube. I see all kinds of 12AX7 tubes on eBay.

Well, as far as genuine JAN-numbered tubes (American-made or possibly
foreign-made-but-registered-with-the-EIA...), the only suffixes I am
aware of are W and A.  The A suffix is a reduced-hum version for audio
use (which you don't need for this application, since it's not in the
audio path), and the W means a ruggedized military-spec version, which
is also nothing you need to pay extra for in this application.  Now, if
you get into the current-production Chinese or Russian tubes, they go
their own way as far as what their numbering and lettering means...  

But really, you should probably just replace the cap(s) and resistors
in the pulse amplifier first, which would be much cheaper than buying 
a new 12AX7, and see if that cures your problem (unless you have already
tested the tube in a tube-tester...)

--Bob
=======================================================================
Bob Ellingson					bobe at halted.com
Halted Specialties Co., Inc.			http://www.halted.com
3500 Ryder St.					(408) 732-1573
Santa Clara, Calif. 95051  USA			(408) 732-6428 (FAX)