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

Philco 38-12
#15

Ok let's start at the beginning. Start by aligning the IF at 470KC. Hook your generator to the cap on the 6A7&chassis ground. Take an analog ac volt meter, hook it across the speaker terminals. Set it on the lowest ac range.Let the set and generator warm up for15 mins or so. With the generator set to 470kc and 400cy modulation listen for the signal with the volume up half way or more. Set the output level of the generator at the lowest level that you can get a reading on the ac volt meter.
Now you are all set up to align the IF transformers. Rap a small bit of tape around the tip of your screwdriver blade exposing only about a 1/16 of an inch of the blade. Some sets have B+ on the IF trimmers(plate side) so you don't want to short the B+out. Start with the IF can close to the 6A7. Adj both trimmers for highest reading on the ac meter. Go to 2nd IF can and do likewise. As you peak the trimmers adj signal level down to the minamon
reading on the meter.
Sometimes there is a bit of interaction between the two transformers so replete the adjustment. After you've done this your IF's are done. Don't go back and readjust the trimmers "best sound" or "it plays louder" or any other reason.
Dare I ask, has this set been serviced? New caps and such?
Terry

When my pals were reading comic books
I was down in the basement in my dad's
workshop. Perusing his Sam's Photofoacts
Vol 1-50 admiring the old set and trying to
figure out what all those squiggly meant.
Circa 1966
Now I think I've got!

Terry


Messages In This Thread
Philco 38-12 - by radiola - 05-02-2011, 08:07 PM
Re: Philco 38-12 - by 7estatdef - 05-02-2011, 09:16 PM
Re: Philco 38-12 - by radiola - 05-02-2011, 10:19 PM
Re: Philco 38-12 - by 7estatdef - 05-02-2011, 11:20 PM
Re: Philco 38-12 - by radiola - 05-02-2011, 11:32 PM
Re: Philco 38-12 - by radiola - 05-03-2011, 01:33 AM
Re: Philco 38-12 - by 7estatdef - 05-03-2011, 06:24 AM
Re: Philco 38-12 - by radiola - 05-03-2011, 09:57 AM
Re: Philco 38-12 - by 7estatdef - 05-03-2011, 06:32 PM
Re: Philco 38-12 - by radiola - 05-03-2011, 08:58 PM
Re: Philco 38-12 - by 7estatdef - 05-03-2011, 09:48 PM
Re: Philco 38-12 - by radiola - 05-06-2011, 02:42 AM
Re: Philco 38-12 - by 7estatdef - 05-06-2011, 09:53 AM
Re: Philco 38-12 - by radiola - 05-06-2011, 06:02 PM
Re: Philco 38-12 - by 7estatdef - 05-06-2011, 07:43 PM
Re: Philco 38-12 - by radiola - 05-06-2011, 10:45 PM
Re: Philco 38-12 - by radiola - 05-07-2011, 04:04 PM
Re: Philco 38-12 - by 7estatdef - 05-07-2011, 04:21 PM
Re: Philco 38-12 - by radiola - 05-09-2011, 09:46 PM
Re: Philco 38-12 - by radiola - 05-15-2011, 05:27 PM
Re: Philco 38-12 - by radiola - 05-18-2011, 07:21 PM
Re: Philco 38-12 - by 7estatdef - 05-18-2011, 08:04 PM
Re: Philco 38-12 - by radiola - 05-18-2011, 10:11 PM
Re: Philco 38-12 - by 7estatdef - 05-18-2011, 10:54 PM
Re: Philco 38-12 - by radiola - 05-19-2011, 10:45 PM
Re: Philco 38-12 - by 7estatdef - 05-20-2011, 08:56 AM
Re: Philco 38-12 - by radiola - 05-20-2011, 05:26 PM
Re: Philco 38-12 - by 7estatdef - 05-20-2011, 08:04 PM
Re: Philco 38-12 - by radiola - 05-20-2011, 09:20 PM
Re: Philco 38-12 - by 7estatdef - 05-20-2011, 10:10 PM
Re: Philco 38-12 - by radiola - 05-21-2011, 11:23 PM



Users browsing this thread: 1 Guest(s)
[-]
Recent Posts
HiFi (Chifi) tube amp build - but my own design.
Well, maybe - maybe not  :lol: It's been an interesting project so far! Something so simple, yet so cranky. The 1st one ...TV MAN — 05:12 PM
1949 Motorola 5A9M
Haven't thought of Burgess batteres in a while  https://www.radionostalgia.ca/lib/Images/battery/us/burgess1D.jpgi ...Vlad95 — 03:50 PM
Philco Model 16 wiring question
Measure the voltages first, just in case.morzh — 02:19 PM
1949 Motorola 5A9M
Haven't thought of Burgess batteries in a while Mr. Fixer. Boston Edison always used Burgess in their Bright Star yellow...Paul Philco322 — 02:17 PM
1949 Motorola 5A9M
Thanks Sam. I'll let you know. I can probably scare some up from the local radio club.klondike98 — 02:07 PM
Philco 89 Code 123 Osc Coil
Hello,  I thought I would post my findings on my bad oscillator tickler coil. There were 27 turns on the outer coil b...dconant — 12:38 PM
Philco Model 16 wiring question
Thanks Morzh. So it appears I did wire it incorrectly and I have to switch the wires between pins 2 and 4.bobclausen — 09:24 AM
Philco 46-1209 strange behavior
No, it's not a problem, just during certain condition it could show up. Yes, an internal tube short could do that too. ...morzh — 09:13 AM
HiFi (Chifi) tube amp build - but my own design.
You sound guys are never satisfied. :crazy: :clap:RodB — 09:10 AM
HiFi (Chifi) tube amp build - but my own design.
I got some new ceramic octal tube sockets installed and also tried some different coupling caps.  The results:  The go...TV MAN — 08:42 AM

[-]
Who's Online
There are currently 1295 online users. [Complete List]
» 2 Member(s) | 1293 Guest(s)
AvatarAvatar

>