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.


Messages In This Thread
41-280 alignment equip hook-up question - by eyewonder300 - 08-13-2023, 06:22 PM



Users browsing this thread: 1 Guest(s)
[-]
Recent Posts
PT-6 antenna connections
Notice in the schematic the notch at the bottom of the antenna coil is between pins 3 & 4. Yes, pin 6 of the 7C6 is...RodB — 07:34 PM
bridkarl
I have two PT-6 chassis. On both there is a blue wire that runs from the above chassis transformer to pin 6 of 7C6. So t...bridkarl — 07:23 PM
Cannot Adjust an IF Transformer’s cores
Joseph, now you are an engineer!!RodB — 06:37 PM
PT-6 antenna connections
Hi, reading your explanation I can see the confusion. If you take it one connection at a time it should result in a desi...RodB — 06:34 PM
Cannot Adjust an IF Transformer’s cores
It works! I received the PCBs this morning in the mail, and put everything together. I reused the base from the original...jrblasde — 04:32 PM
PT-6 antenna connections
I seem to have lost my way on this PT-6. I see the antenna aerial transformer schematic - I’m reading pins 1 through ...bridkarl — 12:30 PM
40-150 General questions
Good thing you're a good electrician ... the pictures show a lot of rewiring in your future! Take care and BE HEALTHY!...GarySP — 11:52 AM
40-150 General questions
I think RobB has it right. It is a part number and looks like its stamped on the chassis and that wasn't something you ...klondike98 — 11:41 AM
40-150 General questions
It's most likely a part number. Most of Philco part numbers are in that format. I looked at the parts list for this mode...RodB — 08:10 AM
40-150 General questions
Hi Kevin, No, I don't but I like your Quote about being a good electrician. The way I look at it is "The fact ...MrFixr55 — 08:06 AM

[-]
Who's Online
There are currently 2955 online users. [Complete List]
» 3 Member(s) | 2952 Guest(s)
AvatarAvatarAvatar

>