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 87 chassis operational????
#1

Hi. New to the group and vacuum tube radios as a whole so please help me with each of my questions.
Recently purchased a 87 Highboy Deluxe in pretty decent shape and want to make it sound good. Being a newbie i plugged it in and started messing around with the knobs not knowing what i was doing. I luckily was able to pull in a station though hum and loud buzz/static dominated.

I've since replaced all the steady state caps with 630v film types hoping to get better results. I reinstalled all the tubes to then find out that if one replaces (or i assume swaps) one of the 26 tubes a new alignment is in order.

Currently it still hums (not too bad) but loud buzz/static is very prevalent and now i'm up to two stations barely. So here are my questions:
1. I'm getting 42 volt AC with a multimeter measuring from the chassis to electrical outlet ground with just the plug in the wall - is this expected? It turns to 65volts AC when powered up. Of course if i run a wire from the chassis ground connector to the outlet ground it goes to 0 volts but my reception also disappears.
1b. How is one really/typically supposed to "ground" the chassis?
2. I'm also getting 120volts AC at the LOC terminal? Is this expected? If not - why? If so, what's the point?
3. not knowing if i got the 26 tubes back in their original position is an alignment and neutralization in order?
3b. Alignment procedure requires a 1300kHz source - function generator work? Set to how many volts output?
3c. Use an "output indicator across the speaker terminal" does this mean a volt meter?
That's all my current questions. Please help and provide suggestions...
THANKS!


Messages In This Thread
philco 87 chassis operational???? - by alwayslearning - 06-07-2016, 10:36 PM
RE: philco 87 chassis operational???? - by morzh - 06-08-2016, 08:38 AM
RE: philco 87 chassis operational???? - by Arran - 06-11-2016, 05:04 AM
RE: philco 87 chassis operational???? - by morzh - 06-08-2016, 02:47 PM
RE: philco 87 chassis operational???? - by morzh - 06-11-2016, 12:10 PM



Users browsing this thread: 2 Guest(s)
[-]
Recent Posts
46-1213 Schematic Question
In the photo of my Chassis, I now have two wires marked "A" and "B", these are my power cord wires. ...MissouriLarry — 02:46 PM
46-1213 Schematic Question
Gary, Thanks for the reply!  I have no intention of introducing any electric to my radio until I recap it.  I just want...MissouriLarry — 02:14 PM
46-1213 Schematic Question
Hi Larry, Usually you'll want to attach the hot side of the power line cord to the power switch. That way when the s...RodB — 02:06 PM
1934 American Bosch 440T restore on YouTube
That's an interesting radio Buzz! Great first video also...Eliot Ness — 01:59 PM
46-1213 Schematic Question
Hello Larry. Replacement of the power cord is a priority, but not the first. All paper and electrolytic capacitors nee...GarySP — 01:36 PM
46-1213 Schematic Question
Ok, now is time to post my first question.  I have a Philco 46-1213 that I am going to start working on here real shortl...MissouriLarry — 12:48 PM
Another amp build - here I go again!
Well, never enough yet how much is too much? I ordered some spare parts from a couple vendors in China and now have ship...TV MAN — 10:49 AM
A Marconi model 86
This Marconi was a bit of a challenge. It was totally missing one electrolytic  capacitor, and the photos show a couple ...Dan Walker — 10:48 AM
Philco 42-345 Restoration/Repair
With regard to the speaker, unless the cone is so brittle that it crumbles as soon as you touch it I would try to repair...Arran — 04:07 AM
Philco 42-345 Restoration/Repair
That silver can capacitor is an aluminum electrolytic. You should replace it with an aluminum electrolytic with the valu...RodB — 11:46 PM

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

>