Welcome Guest! Be sure you know and follow the Phorum Rules before posting. Thank you and Enjoy! (January 12, 2025) x

Thread Closed

Advice on output transformer
#1

  I'am working on an philco model 14lzx it has two speakers H-7 & K12 it has 2-42 push/pull output tubes.
Would a hammond 125D ot trans. work for this? oops wrong thread!! Hope moderator can move.
#2

Moved Icon_smile

You need to match a 16,000 ohm primary impedance to two 1.25 ohm voice coils connected in parallel - which means 0.625 ohm! So you will probably just have to experiment with the output taps, and use the two that produce the loudest sound from your speakers.

The 125D is rated at 10 watts output, which is probably adequate for your 14LZX.

--
Ron Ramirez
Ferdinand IN
#3

I think pins 1 and 2 for the load will work.
It gives 134 ratio at needed 160. Not ideal but close.
#4

Thanks Ron and morz.




Users browsing this thread: 1 Guest(s)
[-]
Recent Posts
54C Complete Teardown/Rebuild
Hello Roy, here is this one sincerely Richardradiorich — 12:45 AM
54C Complete Teardown/Rebuild
Richard, Had grabbed it already but thank you just the same.  I find myself wanting to find some way to block out the...glyphmon — 12:03 AM
54C Complete Teardown/Rebuild
Hello roy, here is a link to the schematic . Sincerely Richardradiorich — 11:54 PM
54C Complete Teardown/Rebuild
Richard, The Silvertone 2014 also is a transformerless set, so I am incorporating a 1:1 600 ohm audio isolation transfo...glyphmon — 11:37 PM
Preliminary work on wife's Silvertone 2014
Did an alignment today which was interesting.  IF alignment went great, almost all was already spot-on.  Adjusting on th...glyphmon — 11:35 PM
54C Complete Teardown/Rebuild
The main problem with adding a Bluetooth input is that this set lacks a traditional power transformer to isolate it from...radiorich — 11:19 PM
54C Cabinet Refinish
I started stripping this cabinet before it got super chilly out because I knew I wasn't going to be able to work on ...glyphmon — 11:18 PM
54C Complete Teardown/Rebuild
While I'm waiting to wrap up the final steps on my wife's Silvertone 2014, I started disassembly on the next project.  O...glyphmon — 11:07 PM
Preliminary work on wife's Silvertone 2014
Hello roy, that great news glad it worked out for you !! Sincerely Richardradiorich — 10:50 PM
Preliminary work on wife's Silvertone 2014
Safety caps arrived today.  Soldered one in and had a successful first power-up.  No magic smoke escaped and it tunes in...glyphmon — 09:53 PM

[-]
Who's Online
There are currently 1967 online users. [Complete List]
» 1 Member(s) | 1966 Guest(s)
Avatar

>