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

Thread Closed

Whistling in 40-150
#4

Dave, thanks for the advice (and you, too, cwtravis.) I'll move some wires around and see what I can make happen.

The previous "restorer" had installed new filter capacitors, cutting the old cans out of the circuit. He basically hung the new filters, some other caps, and a couple of resistors in mid-air, connected with stiff bus wire and some sleeving, all in a bundle in the vicinity of the first AF tube. The result was a dreadful hum that increased at each end of the volume control and came to a minimum when the volume was at the mid-point.

Unfortunately, all this is under the push-button coils, so the photos I've seen don't show the wires very well. I restuffed the capacitor cans and then had to make up my own routing for most of the power supply wires.

All the other wires that I replaced I soldered the new wire to one end of the old and then pulled the new wire through the exact routing of the old.

I did make one mistake in not noting the exact routing of the B+ wire to the 2nd IF transformer. That wire weaves over and under several of the wires going to the IF tube on its way to a B+ terminal but I forgot to note exactly how. That area might be a good one to start with moving wires around.

John Honeycutt


Messages In This Thread
Whistling in 40-150 - by Raleigh - 10-15-2007, 10:36 PM
[No subject] - by davemc - 10-16-2007, 10:08 AM
[No subject] - by Carl Travis - 10-16-2007, 12:18 PM
Lead dress - by Raleigh - 10-16-2007, 12:55 PM



Users browsing this thread: 1 Guest(s)
[-]
Recent Posts
Stromberg Carlson 1500 Squeal
And life just keeps getting more complicated. By dconant. Dittos'Jimradio — 08:01 AM
Plug Voltages Needed For A 1943 CRV-20130 Power Supply
That looks a lot like an aircraft connector of some kind, even if it's a U.S.N power supply. I have a book somewhere abo...Arran — 02:56 AM
Plug Voltages Needed For A 1943 CRV-20130 Power Supply
hello david, I have a similar generator in my collection that features a cast iron, single-cylinder Briggs & Stratt...radiorich — 01:00 AM
under chassis parts locator diagram for 1938 Zenith 9s262
Has anyone gone to the trouble of creating an under chassis parts locator image?  Yes, I can identify components by foll...bobloney — 08:57 PM
Plug Voltages Needed For A 1943 CRV-20130 Power Supply
Try looking at this site the book mark is for a old generator that I was given. David    https://radionerds.com/index.ph...David — 08:36 PM
Plug Voltages Needed For A 1943 CRV-20130 Power Supply
Hello Everyone, I am looking for voltage identification for all the pin positions on the socket of a CRV-20130 power su...Tonym4704 — 08:16 PM
Philco P45-6365 Universal Transformer Instruction Manual
Can anyone guide me to where this may be found?GRG — 03:00 PM
54C Complete Teardown/Rebuild
I don't think that I have encountered a 12Z3 before, curious how it uses one of those but includes a #43, which is a 25 ...Arran — 02:17 PM
HiFi (Chifi) tube amp build - but my own design.
It's the other forum. I'm also in DIY, but mostly read there. Honestly, I kinda jumped into this without much thought to...TV MAN — 10:43 AM
Philco 71 Code 125
Hello,  I am in need of a schematic for this radio. Mine has the three separate circular tube shields and a shadow me...dconant — 08:06 AM

[-]
Who's Online
There are currently 1921 online users. [Complete List]
» 1 Member(s) | 1920 Guest(s)
Avatar

>