1. The PHILCO Phorum
  2. Various and Sundry Categories
  3. Test Equipment
Thread Rating:
  • 0 Vote(s) - 0 Average
  • 1
  • 2
  • 3
  • 4
  • 5

Linear Mode
B&K RF Signal Generator Repair
morzh
Odobenus rosmarus
*****
Posts: 15,804
Threads: 553
Joined: Oct 2011
City: Jackson, NJ
#24

05-11-2013, 11:16 PM
Well there are two ways for BE to be open.

The most popular is, the junction is shot, so no current flows, so the CE has to be open. But then the C would be at full Vcc (9V) and not at zero.

Another way is, the bonding wire got detached but the junction is intact.
Then the junction is autobiased and the transistor gets to close, at which point the C goes to 0V or so.

Anyways that's not terribly important. It does look a bit like the Q3 has bought the farm and is actively pushing the daisies now.
(This post was last modified: 05-11-2013, 11:17 PM by morzh.)
Find
« Next Oldest | Next Newest »


Messages In This Thread
B&K RF Signal Generator Repair - by Eric Adams - 05-09-2013, 07:53 PM
RE: B&K RF Signal Generator Repair - by morzh - 05-09-2013, 08:03 PM
RE: B&K RF Signal Generator Repair - by morzh - 05-09-2013, 09:11 PM
RE: B&K RF Signal Generator Repair - by morzh - 05-10-2013, 09:00 AM
RE: B&K RF Signal Generator Repair - by morzh - 05-10-2013, 02:56 PM
RE: B&K RF Signal Generator Repair - by morzh - 05-10-2013, 08:35 PM
RE: B&K RF Signal Generator Repair - by morzh - 05-10-2013, 08:37 PM
RE: B&K RF Signal Generator Repair - by Arran - 05-10-2013, 09:10 PM
RE: B&K RF Signal Generator Repair - by morzh - 05-11-2013, 07:36 PM
RE: B&K RF Signal Generator Repair - by morzh - 05-11-2013, 09:15 PM
RE: B&K RF Signal Generator Repair - by morzh - 05-11-2013, 10:36 PM
RE: B&K RF Signal Generator Repair - by morzh - 05-11-2013, 11:02 PM
RE: B&K RF Signal Generator Repair - by morzh - 05-11-2013, 11:16 PM
RE: B&K RF Signal Generator Repair - by morzh - 05-12-2013, 08:40 PM
RE: B&K RF Signal Generator Repair - by morzh - 05-13-2013, 12:23 PM
RE: B&K RF Signal Generator Repair - by morzh - 05-15-2013, 01:36 PM
RE: B&K RF Signal Generator Repair - by morzh - 05-15-2013, 02:49 PM
RE: B&K RF Signal Generator Repair - by morzh - 05-16-2013, 09:34 AM



Users browsing this thread: 2 Guest(s)
[-]
Recent Posts
My last cabinet for this year
They are a nice looking radio, Stromberg. I have a small tabletop octagon-dial one. It sounds surprisingly nice. And t...morzh — 09:40 PM
Philco 41-608 changer coupler
Different years but the same idea.morzh — 09:38 PM
My last cabinet for this year
That’s a beauty! :thumbup:klondike98 — 09:24 PM
Philco 41-608 changer coupler
Hi Morzh, I've searched using Mondial as the user name with various keywords such as 'coupler', 'motor', 'idler', 'p...alangard — 08:31 PM
Philco 16B Parts
I think the chassis is painted.morzh — 08:13 PM
Philco 38-2 Automatic Tuning
Honestrly, the original is quite acceptable and, it seems to me, can be cleaned.morzh — 08:11 PM
Philco 41-608 changer coupler
Mondial left a thread about remanufacturing thois type coupler.morzh — 08:09 PM
IF can wire size and Rubber mounts?
Are you talking about rewinding or rewiring? For rewiring, meaning runnin wires to the coil from other components, the ...morzh — 08:08 PM
12' Philco
I wonder who would be able to "no stoop" with this one.morzh — 08:05 PM
IF can wire size and Rubber mounts?
Hello PHORUM members, I am still working on restoration of my PHILCO 37-640.  I want to start with rewiring the IF ca...georgetownjohn — 06:32 PM

[-]
Who's Online
There are currently 4313 online users. [Complete List]
» 3 Member(s) | 4310 Guest(s)
AvatarAvatarAvatar

>
  1. The PHILCO Phorum
  2. Various and Sundry Categories
  3. Test Equipment