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 41-250 power transformer bad?
#1

The power transformer in my 41-250 is putting out 250V on each HV leg with 115V input, but 7.05V on the filament winding (the tubes have 6.3 V filaments). If I go to 120V, the filament goes up to 7.4 V and the HV to 263. The power in our house is typically at 123V. The Philco schematic shows that the primary should be 12 ohms, but it tests 9,7, and it shows that teh HV secondary should be 150 ohms on one side of the center tap and 160 ohms on the other side, but it tests at 131 and 141.

Web site: http://www.masekconsulting.net
Radio Photos: http://www.photobucket.com - album id FStephenMasek
#2

were these voltages measured loaded or unloaded? without tubes your readings will be higher. as far as ohms on the trans,just gives an indication winding is not open,you're fine,fire it up!! after filter replacements of course,phil




Users browsing this thread: 1 Guest(s)
[-]
Recent Posts
My Philco 37-116 Restore
Measuring from center tap like the tube voltages show. Cap 127 is isolated from ground. Cap 127 shown in upper left of p...dconant — 08:05 AM
My Philco 37-116 Restore
Are you measuring relative to the centertap or the GND?morzh — 11:57 PM
Philco 610B oscillator wiring
Still not clear on the wiring interface between the 6A7 and oscillator. After refering to the available schematics and s...Tubester — 07:18 PM
Refinishing Ideas
My 37-116 code 121 is the best sounding radio i have...a daily driver. Since we are talking about "changes". ...poulsbobill — 07:18 PM
My Philco 37-116 Restore
Hello, I finally got brave enough to take the cans off the Expander Unit. Got the grid cap wires replaced and back toget...dconant — 06:50 PM
Zenith H725
I got into the first AM IF can today, and found its mica was cracked. Amazing that it was still working. This one makes ...EdHolland — 06:10 PM
Philco model #20
AHH HA , I got it and can’t thank you fellows enough , when I changed the capacitors I took the advice and did not unsol...onlyrick — 02:24 PM
Zenith H725
Hello Ed, yes, I like letting projects run for few days to make sure they don't start acting up . Sincerely Richardradiorich — 01:03 PM
Philco 46-480 Electronic Restoration
I am almost finished with this restoration. All which remains is the power transformer. I cleaned it up some time ago, b...jrblasde — 12:41 PM
Philco model #20
I seem to recall in some TRF sets there being a Local/Distance toggle switch that removes the B+ from the first 24 rf tu...RodB — 09:46 AM

[-]
Who's Online
There are currently 758 online users. [Complete List]
» 1 Member(s) | 757 Guest(s)
Avatar

>