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

Speaker Connection to Ground in 42-350
#1

OK, this is embarrassing. I'm almost finished rewiring and recapping a 42-350 that I started before Christmas. I took notes and drew pictures where the wires went, but unfortunately left the speaker wires off of the drawings. I probably figured it would be easy to reconnect them to the secondary leads from the output transformer, so I didn't bother to draw them in.

That was true with the one of the leads, but the output transformer has only one secondary lead. The other is soldered right to the transformer frame and apparently grounds to the chassis through the rivets.

My question is: can I ground the other side of the speaker to any convenient ground, regardless of where it went originally? The two speaker leads are the same length and are tied together about 3 inches from the end, so they evidently terminated near one another. The most convenient ground terminals are the center pin of the rectifier tube socket and the ground pin of the Bakelite condenser.

What do you guys think? Will any convenient ground do? Is there any reference to where this wire went originally?

Lesson learned. Never again take apart a radio without using the digital camera!

John Honeycutt
#2

Hope I'm not speaking out of line since I haven't seen this particular set, but going to assume that it shouldn't be too critical where you connect the wire since it's an audio return path. Lead dress can make a difference in other stages but I'm thinking for this you should be fine at any convenient ground point.




Users browsing this thread: 1 Guest(s)
[-]
Recent Posts
Refinishing Ideas
Hi Poulsbobl, I think that you could get away with it.  In the Philco Library, there is a parts listand specs for sp...MrFixr55 — 11:54 PM
Philco 46-480 Electronic Restoration
The sleeving for the transformer arrived early, so I went ahead and finished reassembling. The chassis looks far better ...jrblasde — 10:15 PM
Philco 610B oscillator wiring
I don't know what you are referring to when you say "tube cathode ground". Ground is a connection to the chass...RodB — 05:56 PM
Zenith H725
Good points, Arran. I haven't encountered this problem with any other radio (all earlier vintages), so am learning here....EdHolland — 05:32 PM
Zenith H725
Ed; One thing that I will say about these is that Brand Z was considerate enough to make these mica caps easily acces...Arran — 02:34 PM
Philco 610B oscillator wiring
Do you know what run # your chassis is? It took me a while to find what you were basing updates/modification on as I did...Radioroslyn — 07:34 AM
Need to purchase some accessories for restoration of my Old Philco Radio
COLLEAGUES, Thank you all for such good and important suggestions as how to find good replacement parts. I will go fo...palonso — 07:05 AM
Zenith H725
Here's what the inside of AM IFT2 looked like, and the other pic shows the discs I made to take place of the mica and ke...EdHolland — 07:40 PM
Zenith H725
IF2 will need replacement caps. The arcing was severe enough that the mica is pitted and holed where the HT flashed over...EdHolland — 04:04 PM
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

[-]
Who's Online
There are currently no members online.

>