Thread Rating:
  • 0 Vote(s) - 0 Average
  • 1
  • 2
  • 3
  • 4
  • 5

RCA 35X
#1

I may have mentioned this Lil' Nipper. While recapped and has had tubes checked it has a static problem. While tuning between stations there is quite a racket, when you land a station it sounds pretty good. I have seen photos of this chassis with all tubes metal types except rectifier and output. In mine I have 12SA7 only as a metal, could that play a part? Perhaps the small cap on the antenna needs replacing? Something in the IF cans, very scary for me if in the cans, at least for me. Is it too early a set to have a silver mica issue? 

I have had this for years and was poking around downstairs and tried a tube swap, cleaned out tuning condensor, checked solder joints, loked for a frazzled wire......no results. Sometimes these types better left as Shelf Queens. 

It is very cute, has a neat dial glass, and an RCA jack, original finish is OK but getting rough in spots, kinda like me. I would love to have it as a regular player. It is small and fits anywhere, but that darn static............very annoying. It is a seemingly simple set with a maddening problem Icon_twisted Icon_twisted Icon_twisted.

Here she be.......

https://www.flickr.com/photos/92577012@N...2945852991

Paul

Tubetalk1
#2

You could either have plates rubbing on the tuner or they could have grown 'whisker's that are touching between plates. I had a Crosley with the latter issue as they used rather cheap steel in their tuning capacitors. Never really did figure out a repair. Icon_sad Like you said with your RCA, once you landed a station it played great.
The first thing would be to check for dirt or dust between the plates as that can cause noise. Also, (how do I explain this?) I cured one radio by spraying contact cleaner where there the moving part of the tuning capacitor makes contact with the copper wipers or contacts. Someone else can probably explain that better than me!

No matter where you go, there you are.
#3

Set was designed for metal tubes with exception to the rectifier and the Last Audio...

Then I would look at one of the mica caps in the front end.

This set is too old for "SMD" as it has compression trimmers in the IF's

First, isolate the noise at the volume control, be sure it is coming from the "front" end... Try the wooden probe method on the caps resistors socket and coils. If no joy, try cooling spray on the resistors. Then probe the front end stages.. When it comes to noise every trick in the book. It can be caps, resistors, coils, tubes, ya, anything, so stage by stage may be required.

Do put in the metal tubes, the shield is integral with them...

Chas

Pliny the younger
“nihil novum nihil varium nihil quod non semel spectasse sufficiat”




Users browsing this thread: 1 Guest(s)
[-]
Recent Posts
Philco 91 Speaker Replacement
The spider is glued on the cone and so is the voice coil. I think you can use a cotton swab dipped in acetone and carefu...RodB — 02:42 PM
Restoring Philco 37-604C
Yes I saw that. If I knew, I'd probably try to arrange for getting it myself. But I have just got one. Which does not m...morzh — 01:44 PM
Philco 38-2 Automatic Tuning
When you push the lever, you are supposed to rotate the disk to the desired station. Then the magnetic tuning will acqu...morzh — 01:42 PM
Philco 38-2 Automatic Tuning
I figure out the muting from another picture that helped. Now I need to know how the automatic tuning works. When I push...dconant — 12:11 PM
Philco 91 Speaker Replacement
How would I go about removing the spider from the cone?dconant — 12:04 PM
Philco 38-2 Automatic Tuning
Hello, I am having trouble getting my automatic tuning to stay unmuted. If I play with the tuning handle I can get it to...dconant — 10:51 AM
Does anyone make photofinish replacements?
Here’s the link to the DIY photofinish section of our site: klondike98 — 09:46 AM
Delco car radio Peko vibrator converstion issues
Hi Richard, Thx for posting the schematic.  As I remember as a kid, these were great performers for the time, likely...MrFixr55 — 08:56 AM
Delco car radio Peko vibrator converstion issues
hello mr Fixr, The Electro  Powersupply that I am powering the radio with has a huge choke plus a 10,000ufd electrolyti...radiorich — 10:58 PM
Delco car radio Peko vibrator converstion issues
How about putting a choke in the power supply? The big cap was likely an attempt to stabilize the DC. Kids who cre...MrFixr55 — 09:19 PM

[-]
Who's Online
There are currently 1829 online users. [Complete List]
» 2 Member(s) | 1827 Guest(s)
AvatarAvatar

>