Welcome Guest! Be sure you know and follow the Phorum Rules before posting. Thank you and Enjoy! (January 12, 2025) x

Thread Closed

Trouble Aligning 116B-121 IF
#1

I'm having trouble aligning the IF stages of a 1935/36 116B-121 Tombstone, (2nd Detector, 2nd IF, 1st IF). It's been recapped and out of spec resistors replaced, but I'm not getting much deflection on the shadow meter and the AVC voltage is about half what it should be.

What I noticed while doing the alignment is that the tuning slugs want to be turned all the way down for maximum output voltage. And even bottomed out I don't pass through a peak voltage point.

I have not replaced any mica caps, but the only ones I see in the IF stages are the variable mica caps to trim the coils. Resistance in the coils checks out.

I've tried removing the 3 IF cans to have a look, but haven't figured out how to do it. They look to be spot welded together and must come out as a unit. Would appreciate any tips on freeing all three retaining clips.

Any ideas on what to try next would be very much appreciated.

John


Messages In This Thread
Trouble Aligning 116B-121 IF - by JWD - 10-01-2012, 12:11 AM
RE: Trouble Aligning 116B-121 IF - by TA Forbes - 10-01-2012, 12:21 AM
RE: Trouble Aligning 116B-121 IF - by JWD - 10-01-2012, 04:07 PM
RE: Trouble Aligning 116B-121 IF - by Steve Davis - 10-01-2012, 05:45 PM
RE: Trouble Aligning 116B-121 IF - by JWD - 10-01-2012, 07:40 PM
RE: Trouble Aligning 116B-121 IF - by TA Forbes - 10-02-2012, 04:04 AM
RE: Trouble Aligning 116B-121 IF - by codefox1 - 10-02-2012, 02:39 PM



Users browsing this thread: 1 Guest(s)
[-]
Recent Posts
Plug Voltages Needed For A 1943 CRV-20130 Power Supply
Hello Everyone, I am looking for voltage identification for all the pin positions on the socket of a CRV-20130 power su...Tonym4704 — 08:16 PM
Philco P45-6365 Universal Transformer Instruction Manual
Can anyone guide me to where this may be found?GRG — 03:00 PM
54C Complete Teardown/Rebuild
I don't think that I have encountered a 12Z3 before, curious how it uses one of those but includes a #43, which is a 25 ...Arran — 02:17 PM
HiFi (Chifi) tube amp build - but my own design.
It's the other forum. I'm also in DIY, but mostly read there. Honestly, I kinda jumped into this without much thought to...TV MAN — 10:43 AM
Philco 71 Code 125
Hello,  I am in need of a schematic for this radio. Mine has the three separate circular tube shields and a shadow me...dconant — 08:06 AM
Stromberg Carlson 1500 Squeal
And life just keeps getting more complicated.dconant — 07:57 AM
54C Complete Teardown/Rebuild
Hello Roy, here is this one sincerely Richardradiorich — 12:45 AM
54C Complete Teardown/Rebuild
Richard, Had grabbed it already but thank you just the same.  I find myself wanting to find some way to block out the...glyphmon — 12:03 AM
54C Complete Teardown/Rebuild
Hello roy, here is a link to the schematic . Sincerely Richardradiorich — 11:54 PM
54C Complete Teardown/Rebuild
Richard, The Silvertone 2014 also is a transformerless set, so I am incorporating a 1:1 600 ohm audio isolation transfo...glyphmon — 11:37 PM

[-]
Who's Online
There are currently 2021 online users. [Complete List]
» 2 Member(s) | 2019 Guest(s)
AvatarAvatar

>