Philco 52-542-1 totally dead
Posts: 1
Threads: 1
Joined: Jun 2018
City: Anacortes
State, Province, Country: WA
I just acquired a Philco 52-542-1 and upon initial inspection, the chassis is clean, no rust...the tubes all test very good, none are at all weak...the original caps, resistors and electrolytic cap look new....when i plug it in, not even the dial lamp illuminates and the bulb is good and works independently...not even the tubes warm up.....no sound, nothing, everything is cold......the power cord is in good shape, no breaks or cracks and is fully intact underneath.......any thoughts would be appreciated as to where I should start.......not even having the dial light come on, let alone everything else, is a curiosity....I suspect I need a new volume pot which is part number 33-5566-4 or equivalent at 500,000 ohm
Posts: 713
Threads: 8
Joined: Apr 2018
City: S. Dartmouth
State, Province, Country: MA
Confirm your suspicions, check the continuity of the on/off switch. Try a non-flammable contact cleaner inside the switch and turn on-off many times, this may restore continuity.
Chas
Pliny the younger
“nihil novum nihil varium nihil quod non semel spectasse sufficiat”
Posts: 1,257
Threads: 32
Joined: Jan 2014
City: Wellborn Florida
Looks like a nice AC/DC set.
Posts: 16,482
Threads: 573
Joined: Oct 2011
City: Jackson
State, Province, Country: NJ
A 1952 radio, young it be compared to 1930-s sets, still requires recap, especially electrolytics which dry up no matter the looks.
Before you do this, I strongly discourage you to power it up.
The radio being AC/DC set, the lamp and tubes not glowing means there might be a tube with open filament. Check the tubes. Also if there are loctals, their pins oxidize - need to be scratched.
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.
Posts: 1,257
Threads: 32
Joined: Jan 2014
City: Wellborn Florida
May I ask what is the number of the dial lamp? David
Posts: 4,433
Threads: 419
Joined: Jun 2011
City: Boston
State, Province, Country: Massachusetts
Kind of a neat looker. The recap is a must.
Paul
Tubetalk1
Posts: 1,531
Threads: 242
Joined: Sep 2012
City: West Bend, Wisconsin
Most of these sets use a #47 dial lamp bulb
Here's the schematic pages from Nostalgia Air, which includes the parts list:
http://www.nostalgiaair.org/pagesbymodel...013741.pdf
Greg V.
West Bend, WI
Member WARCI.org
Posts: 184
Threads: 3
Joined: Feb 2018
City: Chesapeake VA
Only a simple ohm test of switch in on & off positions is necessary to verify continuity.
Assuming only one dial lamp, bayonet base bulb should always be #47 or #51. If mfgr used something of higher current, they are outside the original design of 35Z5. This is not to say one can't fudge a bit.
BTW there are many later type bulbs that are 6.3v@150ma. Numbers #130, 755 & 1847 come to mind, any of these could be used.
Tom
(This post was last modified: 06-27-2018, 10:12 AM by 35Z5.)
Posts: 1,257
Threads: 32
Joined: Jan 2014
City: Wellborn Florida
The reason I asked the question about the number of the dial lamp I have found some very creative work when folks did not have the correct bulb. One set had a appliance bulb installed at the back of the set but with a 15 watts bulb you could see the dial, even when the set was turned off, radio and night light combo.
(This post was last modified: 06-27-2018, 05:24 PM by David.)
Users browsing this thread: 1 Guest(s)
|
|
Recent Posts
|
|
Zenith H725
|
| David - I think I understand but what units are you discussing (Low of 1.7, high of 3.9)?
Budget constraints for Ham ...EdHolland — 01:43 PM |
|
My Philco 37-116 Restore
|
| You're doing great.
I wish I could be more involved, but my mind is right now preoccupied with the reason I am here in ...morzh — 12:21 PM |
|
My Philco 37-116 Restore
|
| Hope you guys are still with me.
I have moved on to the alignment. I completed the IF alignment which was pretty muc...dconant — 10:47 AM |
|
My Philco 37-116 Restore
|
| Hello MrFixr55,
Thank you for taking the time to explain. I measured 50 volts where you say. Today the 370 volts at ...dconant — 12:51 PM |
|
462ron
|
| Oh that sucks. It’s something easily overlooked. Hopefully it’s nothing more than a resistor!
Ron462ron — 08:08 AM |
|
Philco 46-480 Electronic Restoration
|
| Just confirmed that you are correct. It’s the function generator. I connected the signal output probe to one of the inpu...jrblasde — 07:52 AM |
|
Philco 46-480 Electronic Restoration
|
| Ouch, you may be right. Yes, it is solid state. It’s the signal output of my oscilloscope.
May be time to crack that ...jrblasde — 07:27 AM |
|
462ron
|
| If you didn’t put a DC blocking cap between the signal generator probe and the plate of the 1st IF it’s possible you ble...462ron — 07:07 AM |
|
My Philco 37-116 Restore
|
| Hi DConnant,
The reason why C127 is isolated from ground is because sets of this vintage did not have the center tap...MrFixr55 — 01:07 AM |
|
Philco 46-480 Electronic Restoration
|
| The shield is on the 6H6.
It was, in fact, a missing jumper to connect the main chassis ground to the RF chassis grou...jrblasde — 10:58 PM |
|
Who's Online
|
There are currently 1030 online users. [Complete List]
» 1 Member(s) | 1029 Guest(s)
|
|
|
|
 
|
![[-]](https://philcoradio.com/phorum/images/bootbb/collapse.png "[-]")
