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

LYRIC JR , All Amrican Mohawk
#1

My 22 year old daughter asked me if she could have a old console radio for her dinning room , I ofcoarse said yes, having over 500 radios, in 1991 I fixed up this 1930 Lyric "J" little console,very nice looking, used it as a working display at a local radio station's 50th aniversity,[1941] played great all that day, then the radio was put in to storage, got it out last weekend. This radio's chassie is a six tube, counting rectifier, TRF, uses three 24's for RF amp, and an other 24 for detector and a 45 output,
The radio played but if you turn up the volume it will osilate, like the early 1920's regenative radios , all the volume control is, is an antenna trimer , we don't have much of an antenna, my daughter is happy with the volume and sound it has ,but I'm not! OK, what's happening? is it feeding the signal over and over in the detector like an old regenitive ? maybe a bad mica cap?
#2

I wonder if changing the antenna length would affect it? Maybe add a small cap, say 100-250 pf range?

The other thing that comes to mind are riveted ground connections or shields in general if it has been sitting idle for so long.

And if you have a variac handy you might try dropping the AC voltage to see it and see how it goes.

GL, Bill
#3

All very good advise indeed Exray!! Also, if ever a old chassis-design could ever benefit from making sure orig "tube-shields" arent missing,and actually used where needed, the TRFs are a classic case of needing them in most cases! As a old-timer radio tech once told me,all mfgrs TRFs chassis are: " as touchy as a old-maid at a stagg-convention"! (hee hee) No wonder most Atwater Kents used metal-cabinets as a overall chassis shield with a pop-off top lid? All my TRFs work well with approx 25' outdoor longwire antenna. Seems to balance well with all my personal sets. Todays more powerful AM local broadcasters transmitters also wreak-havoc on all the old TRFs for overloading the antennas. Thats where your suggestion of adding the cap helps alot too!! Ive used many a aluminum beer-can with both ends cut off to mfgr tube-shields for these type sets with good results also. The TRFs are super-touchy indeed in todays world of mass generated RF! Most better TRF chassis designs can even receive RF generated by most nearby neighbors washing-machines during the spin-cycle also! Icon_wink




Users browsing this thread:
[-]
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 2910 online users. [Complete List]
» 1 Member(s) | 2909 Guest(s)
Avatar

>