Thread Rating:
  • 0 Vote(s) - 0 Average
  • 1
  • 2
  • 3
  • 4
  • 5

Philco 19 Restoration (from yet ANOTHER Newbie
#2

Jeff

We will help you with concrete questions and troubleshooting once you get to that.

But first things first, please read through the very basic things one does when starting with an old radio.

That means:

1. No powering up before checking the state of the chassis. Big NO-NO!!!
2. No powering up before changing all electrolytic caps and all the caps that are from B+ to Chassis.
3. Very desirable - changing ALL paper caps. Leave micas alone for the time being.
4. Remove the rectifier tube, measure the load resistance to see if a short is present.
5. Check ALL tubes, so they at least present no danger and could be expected to work reasonably (even if weak) - no shorts or other BAD stuff.
6. At this point if you feel an itch, bring the transformer slowly up by using variac, measure the voltages, see if the output is reasonable and no smoke escapes.
7. Check all the resistors, replace those that are way out of spec (20% and more) or open. Make sure your wire-wound ones are not open, especially the one that connects the negative of the rectifier to the chassis. Sometimes those are Candohms and those are know to open.
8. Replace the rectifier and the tubes, then you can power it now, but ONLY slow using a variac and (very desirable, but absolutely necessary with "hot chassis'") isolation transformer. While bringing the voltage up, do the reading, making sure there are no load shorts / problems.

Now if all holds, nothing smokes and all glows, you can start troubleshooting.
That is where we come in.


Messages In This Thread
RE: Philco 19 Restoration (from yet ANOTHER Newbie - by morzh - 04-18-2013, 09:17 AM
RE: Philco 19 Restoration (from yet ANOTHER Newbie - by boxjoint - 09-26-2013, 01:58 AM



Users browsing this thread: 1 Guest(s)
[-]
Recent Posts
Philco 91 Speaker Replacement
The spider is glued on the cone and so is the voice coil. I think you can use a cotton swab dipped in acetone and carefu...RodB — 02:42 PM
Restoring Philco 37-604C
Yes I saw that. If I knew, I'd probably try to arrange for getting it myself. But I have just got one. Which does not m...morzh — 01:44 PM
Philco 38-2 Automatic Tuning
When you push the lever, you are supposed to rotate the disk to the desired station. Then the magnetic tuning will acqu...morzh — 01:42 PM
Philco 38-2 Automatic Tuning
I figure out the muting from another picture that helped. Now I need to know how the automatic tuning works. When I push...dconant — 12:11 PM
Philco 91 Speaker Replacement
How would I go about removing the spider from the cone?dconant — 12:04 PM
Philco 38-2 Automatic Tuning
Hello, I am having trouble getting my automatic tuning to stay unmuted. If I play with the tuning handle I can get it to...dconant — 10:51 AM
Does anyone make photofinish replacements?
Here’s the link to the DIY photofinish section of our site: klondike98 — 09:46 AM
Delco car radio Peko vibrator converstion issues
Hi Richard, Thx for posting the schematic.  As I remember as a kid, these were great performers for the time, likely...MrFixr55 — 08:56 AM
Delco car radio Peko vibrator converstion issues
hello mr Fixr, The Electro  Powersupply that I am powering the radio with has a huge choke plus a 10,000ufd electrolyti...radiorich — 10:58 PM
Delco car radio Peko vibrator converstion issues
How about putting a choke in the power supply? The big cap was likely an attempt to stabilize the DC. Kids who cre...MrFixr55 — 09:19 PM

[-]
Who's Online
There are currently 3071 online users. [Complete List]
» 2 Member(s) | 3069 Guest(s)
AvatarAvatar

>