1. The PHILCO Phorum
  2. Various and Sundry Categories
  3. Other Radios (Non-Philco)

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

Threaded Mode
Selenium Rectifier Replacement
Joe Rossi
Senior Member
****
Posts: 467
Threads: 31
Joined: Sep 2009
City: Lapeer State, Province, Country: MI
#16

02-22-2015, 02:26 PM
(02-22-2015, 12:32 PM)codefox1 Wrote:  Sorry for possibly misleading anyone, (should have looked at schematic before typing,) and agree that in an AC/DC/BATTERY set, the end of the voltage divider feeds the filament string, and it is VERY important to do whatever is needed to get that final voltage correct. Even before restoration sometimes the filament voltage is too high with today's line voltage and an increase in the first an last resistor in the chain can correct the situation.   This is doubly important when replacing a blown 117Z3 or equivalent in similar sets.

No problem codefox1!  It is fortunate that the set actually works at this time. (The folks conducting the estate sale were actually using it!  I unplugged it and bought it.) I can measure the voltage before and after replacing the caps and resistors, then work the math to determine the proper resistance needed.  Joe
Joe

Matthew 16:26 "For what does it profit a man if he gain the whole world, yet lose his own soul?"
Find
« Next Oldest | Next Newest »
Thread Closed




Users browsing this thread: 1 Guest(s)
[-]
Recent Posts
Philco 42-345 Restoration/Repair
So far still no broadcast, I am posting pictures of #14 Oscillator and also a resistor #27 which connects to an XXL tube...osanders0311 — 04:02 PM
Part numbers to model cross
I believe there is that document, and I think we might have it in the Library.morzh — 03:29 PM
Philco 42-345 Restoration/Repair
Ok MrFixr55,  I have tried the DeoxIT D5 on the band switch and even though it has relieved the tension I felt when turn...osanders0311 — 11:11 AM
Part numbers to model cross
Is there a reference somewhere where you can punch in Philco part numbers and see what models those parts were used in?Jim Dutridge — 10:17 AM
Philco 42-345 Restoration/Repair
Hi OSanders, Look carefully at the band switch. Turn it slowly and "wiggle" it around the desired band. ...MrFixr55 — 12:33 AM
5U4 vs 5Z4 tubes
I think that RCA and GE introduced metal tubes in the USA in 1936.  I don't know if they were being made by RCA, GE or b...MrFixr55 — 11:20 PM
Philco 42-345 Restoration/Repair
Vlad95, Thank you for the stringing guides and wow there are so manyosanders0311 — 06:01 PM
5U4 vs 5Z4 tubes
A pre war Hallicrafters, and an early one too, very nice! 1936 is pretty early for metal tubes too, which would explain ...Arran — 05:58 PM
Philco 42-345 Restoration/Repair
Thanks Rod, "When you hear the background hiss and no station it usually indicates that the oscillator quit" ...osanders0311 — 05:52 PM
Philco 42-345 Restoration/Repair
RodB :beerchug:Vlad95 — 10:22 AM

[-]
Who's Online
There are currently 1044 online users. [Complete List]
» 1 Member(s) | 1043 Guest(s)
Avatar

>
  1. The PHILCO Phorum
  2. Various and Sundry Categories
  3. Other Radios (Non-Philco)