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Post by skykng on Thu Mar 27, 2014 10:48 pm

Hello All:  Been fooling with old radios and ham radio for 60 years - still burn my fingers once in a while - but love the challenge of taking a goner, resurrecting it and the cabinet and ending up with a real piece of history that was made decades ago to grab signals from around the world out of the air.  What I know about electronics in self-taught, former Naval Aviator/Officer, retired in the Shenandoah Valley of Virginia with a collection of about 200 old radios and various pieces of ham gear/receivers for short wave listening.  Currently working on restoring a 1937 Lafayette battery farm radio (only 6 volt car battery required) - trying to get it going, adapted to 120vac power: 2 volt filaments and 90vdc or so B+. Am always busy with many radio/amp projects ongoing, fixing sets for others, and enjoying the hobby with friends in the area.  I have found these forums to be great fun and tremendous help when Murphy strikes again and again.  The knowledge, talent and humanity out there is amazing -- wonderful to have a place to go for good advice, education and camaraderie.  Looking forward to this experience.  Best, Steve
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Post by Guest on Thu Mar 27, 2014 11:04 pm

Welcome Steve, I'm only a few miles from you, just south of Harrisonburg.

Maybe we can have lunch some day.

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Post by skykng on Thu Mar 27, 2014 11:41 pm

Sure! Be happy to..........will send you an email Wednesday or so to see when you are able to meet for lunch. best, steve
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Post by Wildcat445 on Fri Mar 28, 2014 12:46 am

Welcome, Steve. Glad you are here.

Regards

WC

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Post by Tony V on Fri Mar 28, 2014 1:16 am

Welcome Steve from another neighbor! I live in Waynesboro
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Post by 75X11 on Fri Mar 28, 2014 6:32 am

Welcome!
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Post by skykng on Fri Mar 28, 2014 9:57 am

Thank you, carpe diem -Tony, Willy and 75X11..................
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Post by Guest on Fri Mar 28, 2014 10:05 am

Tony, maybe you could join us for lunch.

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Post by Bill Cahill on Fri Mar 28, 2014 11:11 pm

Welcome to TRF from Florida...............
Anyhbody want to bring me some TV's this year????

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Post by willy3486 on Fri Mar 28, 2014 11:44 pm

Welcome aboard. If you need a power supply for a battery radio There is a neat looking one at the bottom of the page I am linking to. I actually bought the parts to make a couple but I haven't done so yet. A future project I hope to do soon. Its the a/b/c supply at the bottom of the page

Battery supply

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Post by N7ZAL on Fri Mar 28, 2014 11:49 pm

Welcome to a nice forum, with great people.
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Post by skykng on Sat Mar 29, 2014 10:27 am

Willy3486 - Thanks very much.  Got it. Lesson learned here: the schematic shows a vibrator power supply mounted on the chassis to supply the A + B voltages from a 6 volt car battery (1937).  I removed that ps and using separate supplies, provided the 90vdc and 2 vdc from the 120v ac line - well filtered.  The schematic showed a resistor network to distribute the 2vdc to the filaments from the 6 volt input - that network was grounded to the chassis.  

I had a horrible loud, low pitched buzzing that drowned out everything when I tied the filament line to the chassis that also had the B- tied to the chassis. I tried everything I know to find where the buzzing was coming from - no joy.  In my sleep (I do my best work in my sleep) I dreamed that floating the filament A- isolated from B- chassis ground would solve the buzzing riddle.  Sure enough - the buzzing went away.  I am still wondering how they got away with grounding the A- to the chassis through some mild resistors in 1937 without any buzzing.  My B+ is bench produced by a Lambda extremely well filtered, adjustable DC power supply and the filament 2v also is very clean.  Now all I have to do with the proper voltages and no buzzing is figure out why the radio is dead...............ha  Mad 
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Post by Bill Cahill on Sat Mar 29, 2014 6:25 pm

Simple.... Two different supplies.....

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