Welcome Guest! Be sure you know and follow the Phorum Rules before posting. Thank you and Enjoy! (January 12) x

Thread Closed
Thread Rating:
  • 0 Vote(s) - 0 Average
  • 1
  • 2
  • 3
  • 4
  • 5

41-280 alignment equip hook-up question
#1

New to the forum, it's a good source of information/help.

I'm restoring a 41-280 chassis, & have re-cap'd it, checked for other obvious problems, and have gotten it to be able to receive & play a local station - not very many local AM stations in my area.  I would like to do an alignment but am unclear about the exact hook-up points.

I have a Precision Apparatus E-200-C vacuum tube sig gen that can do 400 Hz modulation of the carrier, a new B&K 4040B function generator, a Fluke DVM, HeathKit VTVM (may or may not be working), & a Simpson 260 analog meter.

I'm to hook up the signal generator to the antenna screw terminals on the back, somehow.  Is the antenna completely removed for this?  And that connection is for the 1st alignment operation described in the manual.  The other 5 alignment steps say 'Use loop on generator'.  Does that mean re-attach the antenna to the chassis & then make sore sort of loop that is near the original antenna to couple the sig gen into the antenna?  

And where do I attach the leads from VTVM/DVM/Simpson to monitor the results of my tweaking IF cans?  Directly across the voice coil leads?  Across the AVC signal line? If so, where is the AVC signal that I can hoop up to?  BTW, I'm not that strong on vacuum tube electronics, and look to learn a bit more.

Help & guidance is appreciated.




Users browsing this thread:
[-]
Recent Posts
Philco 42-345 Restoration/Repair
RodB :beerchug:Vlad95 — 10:22 AM
Philco 42-345 Restoration/Repair
Vlad, you nailed it. Swiss and German roots.RodB — 09:54 AM
5U4 vs 5Z4 tubes
Well this is a Hallicrafters SX/9 circa 1936. No real issues so far although I dodged a real bullet with a cap that was...bridkarl — 07:59 AM
5U4 vs 5Z4 tubes
The pinout is the same but the 5U4 has a 3 amp filament, verses 2 amps or less on the 5Z4. I think that the pinout of a ...Arran — 12:04 AM
Philco 42-345 Restoration/Repair
By the way. osanders0311 Take a look here: Dial cord stringing Guides May be here you can fount correct string settin...Vlad95 — 11:15 PM
5U4 vs 5Z4 tubes
5U4 and 5Z4 almost identical. I think nothing happened if you left 5U4 instedad 5Z4 long time. Just heater current 5U4 ...Vlad95 — 11:02 PM
Philco 42-345 Restoration/Repair
Hello Vlad95 , Very Funny ! Sincerely Richardradiorich — 11:01 PM
Philco 42-345 Restoration/Repair
RodB You are European yourself   :evil: I'm Canadian for the last 30 years  :snowman: But not Yankee  :lol: Vlad95 — 10:49 PM
Philco 42-345 Restoration/Repair
The band switch selects different oscillator coils for the band selected. I would look for a bad connection in the switc...RodB — 10:31 PM
Philco 42-345 Restoration/Repair
Hang in there...PaulPaul Philco322 — 09:30 PM

[-]
Who's Online
There are currently 1269 online users. [Complete List]
» 2 Member(s) | 1267 Guest(s)
AvatarAvatar

>