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

Thread Closed

Neutralization of a Philco 87
#8

Kirbyc

When you first tried it, you said the radio worked great. Then you said the trimmer was good, then you said you had to rewind three coils.

Why don't you make sure the coils are all OK and are exactly as they were before they went bad, including the tap location etc.
Then make sure you follow the actual procedure and not what you think the procedure is. Like what if instead of trying to achieve the minimum signal the maximum is being achieved.
Your trimmer not working is suspicious.

Check all the tubes.
Make sure the tube used for neutralizing the stages is what it says it should be. Same tube that is either a dud with all structure OK except the filament is open, or a good tube mounted in a transition socket with one filament pin disconnected.

People who do not drink, do not smoke, do not eat red meat will one day feel really stupid lying there and dying from nothing.


Messages In This Thread
Neutralization of a Philco 87 - by Kirbyc - 10-27-2019, 05:11 PM
RE: Neutralization of a Philco 87 - by morzh - 10-27-2019, 08:33 PM
RE: Neutralization of a Philco 87 - by Kirbyc - 10-28-2019, 01:38 PM
RE: Neutralization of a Philco 87 - by morzh - 10-29-2019, 08:41 AM
RE: Neutralization of a Philco 87 - by Kirbyc - 10-29-2019, 01:00 PM
RE: Neutralization of a Philco 87 - by Kirbyc - 10-29-2019, 01:15 PM
RE: Neutralization of a Philco 87 - by Kirbyc - 11-05-2019, 03:53 PM
RE: Neutralization of a Philco 87 - by morzh - 11-05-2019, 04:33 PM
RE: Neutralization of a Philco 87 - by Kirbyc - 11-06-2019, 12:04 AM
RE: Neutralization of a Philco 87 - by morzh - 11-06-2019, 10:08 AM
RE: Neutralization of a Philco 87 - by Kirbyc - 11-06-2019, 04:43 PM
RE: Neutralization of a Philco 87 - by morzh - 11-06-2019, 05:04 PM



Users browsing this thread: 2 Guest(s)
[-]
Recent Posts
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
Preliminary work on wife's Silvertone 2014
Did an alignment today which was interesting.  IF alignment went great, almost all was already spot-on.  Adjusting on th...glyphmon — 11:35 PM

[-]
Who's Online
There are currently no members online.

>