1. The PHILCO Phorum
  2. Philco Radio Discussions
  3. Philco Electronic Restoration

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
Filament Resistor replacement
elfiself
Member
***
Posts: 58
Threads: 9
Joined: Apr 2016
City: Albany,NY
#1

11-23-2018, 01:45 PM
Half of a 33-3408-3 filament resistor is bad and I'm looking to replace the whole component. It is a 40/80 ohm. what wattage value would be appropriate?
TIA
elfiself
Find
Radioroslyn
Phorum Expert
*****
Posts: 7,305
Threads: 270
Joined: Dec 2009
City: Roslyn Pa
#2

11-23-2018, 02:41 PM
Actual dissipation is abt 3W BUT if you don't want a flaming hot resistor go w/abt X3= 7-10W.
When my pals were reading comic books
I was down in the basement in my dad's
workshop. Perusing his Sam's Photofoacts
Vol 1-50 admiring the old set and trying to
figure out what all those squiggly meant.
Circa 1966
Now I think I've got!

Terry
Find
morzh
Odobenus rosmarus
******
Posts: 16,577
Threads: 574
Joined: Oct 2011
City: Jackson State, Province, Country: NJ
#3

11-23-2018, 03:35 PM
For power resistors I triple the ating, so for 3W it is 10W for me.
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.
Find
elfiself
Member
***
Posts: 58
Threads: 9
Joined: Apr 2016
City: Albany,NY
#4

11-23-2018, 04:51 PM
Thanks Terry. The math works out to 2.4W X3 Looks like 10W should cover it.
Larry
Find
« Next Oldest | Next Newest »
Thread Closed




Users browsing this thread: 1 Guest(s)
[-]
Recent Posts
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
Philco 42-345 Restoration/Repair
Vlad, you nailed it. Swiss and German roots.RodB — 09:54 AM
5U4 vs 5Z4 tubes
Well this is a Hallicrafters SX/9 circa 1936. No real issues so far although I dodged a real bullet with a cap that was...bridkarl — 07:59 AM
5U4 vs 5Z4 tubes
The pinout is the same but the 5U4 has a 3 amp filament, verses 2 amps or less on the 5Z4. I think that the pinout of a ...Arran — 12:04 AM
Philco 42-345 Restoration/Repair
By the way. osanders0311 Take a look here: Dial cord stringing Guides May be here you can fount correct string settin...Vlad95 — 11:15 PM

[-]
Who's Online
There are currently 1132 online users. [Complete List]
» 1 Member(s) | 1131 Guest(s)
Avatar

>
  1. The PHILCO Phorum
  2. Philco Radio Discussions
  3. Philco Electronic Restoration