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| Modern Radio
Laboratories® missing documents and literature |
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| MRL Datasheets, handbooks and
Radio Builder and Hobbyist can be found on the |
Internet Archive |
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| 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. |
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RB&H No. 35 |
RB&H No. 36 |
RB&H No. 38 |
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| Download, read, and enjoy these
priceless MRL publications. |
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| 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. |
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| More MRL documents |
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Radio Flyer No. 23
11 Pages. |
Radio Flyer No. 1
2 pages. |
1972 Catalog cover page
Cover pages usually don't survive. |
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CAN YOU HELP? |
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| 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> |
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| 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-5
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-15
DP-17
DP-20
DP-32 MRL #5 Double Crystal
DP-37
DP-40
DP-42
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-55
DP-60
DP-62
DP-65 MRL #17 "Pinhole Special" Crystal Set
DP-66 MRL #20 Crystal Set
DP-67
DP-68
DP-70
DP-71
DP-72
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. |
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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
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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.
Thanks to Paul Nelson for keeping MRL
alive into the 21st Century.
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