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1956 Mechanix Illustated transistor radio set

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ballroad

Post subject: 1956 Mechanix Illustated transistor radio set

Posted: Wed Apr 17, 2013 2:01 am

Joined: Wed Sep 15, 2010 8:58 pm
Posts: 39
Location: vulcan michigan

I would like to build a retro 1956 M/I transistor radio. plans are from Vintage Projects website/Science& tech/Radio/Transistor radio. The plans call for a 2n107 transistor, what would be a reasonable substitute for this ? also, it calls for a 220,000 ohm resistor.I this real critical, as a value? I have a loopstick and old variable cap coming from Mike Peebles, so ill be set there. I do have a extra 2sb172 that I found cheap, would this be a good choice. Prices on E-Bay for 2n107 or Ck 722 are out of this world im on a budget so......Im just learning so I thought this would be a simple set to play with What kind of voltage and resistance would the 2sb172 like to see in the circuit...Thank You !!!! Perry

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golfguru

Post subject:

Posted: Wed Apr 17, 2013 2:57 am

Joined: Sat Aug 18, 2007 8:52 pm
Posts: 2029
Location: Australia

http://www.vintageprojects.com/radio/tr ... -radio.pdf

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peeblesoriginals

Post subject:

Posted: Wed Apr 17, 2013 3:05 am

Joined: Sat Nov 04, 2006 3:48 am
Posts: 1177
Location: Western Washington State

Perry,

I'm sending your other stuff tomorrow. I have some 2N107's if you want it to be Genuine. $14.95

Otherwise, this will work fine, and look somewhat original:

78-050, 2N2048Transistor, Germanium, TO-5, RF/IF
& Audio$ 4.75

Mike

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ballroad

Post subject:

Posted: Wed Apr 17, 2013 10:40 am

Joined: Wed Sep 15, 2010 8:58 pm
Posts: 39
Location: vulcan michigan

Geez Mike a genuine 2n107 top hat, does it have the pinched top too? Do these age well, if it performs ok consider it sold....Perry....lost in the 50s

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peeblesoriginals

Post subject:

Posted: Wed Apr 17, 2013 1:27 pm

Joined: Sat Nov 04, 2006 3:48 am
Posts: 1177
Location: Western Washington State

Perry,

Top hat, pinched, in original container and all.

Packed with other stuff, and ready to go, today.

Mike

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Ham-er

Post subject: resist

Posted: Thu Apr 18, 2013 1:24 am

Joined: Sun Dec 02, 2007 7:50 am
Posts: 1021

The resistor value is not real critical.

BUT be carefull and dont use too low of a resistance value! You wouldnt want to burn up a vintage transistor.

You could use a 1 or 2 Meg pot even!

luck
kb0lxy

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XtalHWJ

Post subject:

Posted: Thu Apr 18, 2013 1:49 am

Joined: Thu Mar 12, 2009 4:09 pm
Posts: 951
Location: Sonoma County, CA

Quote:

You could use a 1 or 2 Meg pot even!

Maybe not a good idea. Setting the pot close to zero could kill both transistor and pot!

Rich

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Homebrew Radio ex-Silicon Valley

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peeblesoriginals

Post subject:

Posted: Thu Apr 18, 2013 1:54 am

Joined: Sat Nov 04, 2006 3:48 am
Posts: 1177
Location: Western Washington State

The 220K is just about right. . .I'd stick with it.

Mike

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