Elmer G. Osterhoudt
Modern Radio Laboratories®

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Modern Radio Laboratories® missing documents and literature

You can find MRL handbooks and copies of Radio Builder and Hobbyist at AmericanRadioHistory.com
MRL Datasheets, handbooks and Radio Builder and Hobbyist can be found on the Internet Archive

In 2019, some of the MRL documents lost to history surfaced after a fellow fan of MRL named Northe Osbrink donated them to this website.

  RB&H No. 35 RB&H No. 36 RB&H No. 38  

Download, read, and enjoy these priceless MRL publications.

Note: These copies may appear "light." There are several reasons for this. First, Elmer Osterhoudt's lithograph printer actually produced some text that is gray instead of black. Second, the paper he used is thin. A scan of a page shows what is on the reverse side coming through. The paper has also turned a beige color. Scanner settings were meticulously adjusted to produce the best copy possible.

More MRL documents
  Radio Flyer No. 23
11 Pages.
Radio Flyer No. 1
2 pages.
1972 Catalog cover page
Cover pages usually don't survive.

We are actively searching for high quality scans of the "missing" MRL documents. Also desired are photographs of MRL kits and items sold by MRL. Please send email to mike@mikesyard.com   <cut>mike@mikesyard.com<paste>
A list of the "known" missing literature follows. Some of it is over 90 years old.
MRL Oscillator

MRL Blue prints

Radio Builder and Hobbyist issues 1 to 34, 37, 39, 40, 44, 45, 46 and 47

MRL Detail Prints. The following are missing:
DP-3 MRL #38 Crystal Booster
DP-7 MRL #40 Crystal Set
DP-8 MRL #41 Crystal Set
DP-9 MRL #42 Crystal Set
DP-10 MRL #43 Crystal Set
DP-32 MRL #5 Double Crystal
DP-45 MRL #22 DX Marvel
DP-46 MRL #30 DX XTAL Set
DP-50 MRL #21 XTAL
DP-51 MRL #23 Combination DX
DP-52 MRL #13 Slider Crystal
DP-53 MRL #27 Variable Selectivity XTAL
DP-54 MRL #34 Wired Wireless
DP-65 MRL #17 "Pinhole Special" Crystal Set
DP-66 MRL #20 Crystal Set

MRL Catalogs prior to 1972

A 1962 ad in Electronics Illustrated magazine offered 12 issues of Experimenter’s Electronics and Science for $2.50. Only the first two editions are known to exist.

Do you have any of these, and would you like to share them with the rest of us "old timers" and crystal set fans? Please email mike@mikesyard.com Thank you.


I would like to extend a sincere "thank you" to Don Knotts of Hillsboro, Oregon for sending the coils, documents and unassembled kits that were passed down to him from his father. 

Thanks also to tack, Peter Bertini, Number 6, mrx, wazz, Bugman, and radiohenry of the Antique Radio Forum.
Thanks to Sloan Freeman who supplied some information about EO not found in his publications.
Also, thanks to Gary Schneider (RIP 03/12/20) who somehow, some way, still has MRL coils available on his website.
Thanks to Northe Osbrink for supplying the 1973 MRL catalog and Radio Builder and Hobbyist 35, 36 and 38.
Oh yeah, thanks to Scott of "Scotts Crystal Radios," who doesn't know I stole his picture of the MRL No. 2
Crystal Set. He's where you get your headphones for your crystal radios. His website is here.

Thank you also to our Australian friend Graeme Zimmer, who provided the list of MRL publications shown on Page 6 and the photos of the MRL Carborundum crystal.

MRL literature can be found online thanks to AmericanRadioHistory.com.

Thanks to Paul Nelson for keeping MRL alive into the 21st Century.