Meissner Mfg. Div. - Maguire Industries, Inc. 16A Schematic

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Manufacturer:Meissner Mfg. Div. - Maguire Industries, Inc. (Brewster)

Schematics Content:

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Page 1:

Installation-Operation Instructions `
Power Supply: 105-120 volts, 50-60 cycles.
Power Consumption: 130 watts.
Type of Circuit: Superheterodyne.
Intermediate Frequencies: AM 13,55 kc. I
Pointer Travel: 9".
Tuning Knob Ratio: 1811.
Antenna Impedance: Broadcast - Standard
F M ~ 300 ohms
Nominal Performance
Approximately 10 microvolts for 30 db quieting on FM.
Audio Fidelity: Flat witrin i2 db from 100 to 10,000 cycles, tone con-
Band Width at 1000 kc - 7 kc at 2X down.
Output: 8 watts at 5% distortion.
Tone Control Action:
Bass boost at to cycles plus ld db.
Treble suppression at 5,000 cycles - 13 db.
Hum: 58 db below full output, full bass boost (on phono).
Antenna - Ground
There is a 5 terminal strip near the back of the chassis for connection
to the FM antenna, AM antenna, and ground. the FM antenna may be indoors
or outdoors, preferably of the folded dipole type. The two left-hand ter-
minals marked FM are for connection of the twin lead 300 ohm transmission
line from the FM antenna.
A separate AM antenna may be used by connecting to the AN antenna ter-
/`~ minal at the right, or me PM antenna and transmission line may be used as
the AM antenna. This is done by connecting a jumper wire between terminal
X and the AN antenna terminal.
A heavy ground connection, as short as possible, should be connected to
the ground terminal at the center. Cold water pipes or a galvanized rod
driven several feet into the ground make good grounds, but the use of hot
water, steam pipes, or metal conduit should be avoided. The use of a good
ground connection will do much to minimize the pickup of electrical inter-
ference carried into the tuner by way of the power line.
Tone Controls
Bass: 18 db control at to cycles, 12 db at 100 cycles.
f` Treble: lO db control at 0000 cycles, 15 db at 10,000 cycles.
?John F. Rider

Page 2:

ln ohms
2 Meg
to chassis
are not
F. Rider
Pos Tube P1n 1 P1n 2 Pln 3 Pln M Pin S Pin 6 Pin 7 Pin 8 Pin 9 5
01 Cont
P1n 1 P1n 2 P n 3 Pln 1m 5 Pin 6 Pin 7 Pin 8
FM 5J5 O ~- CK T ? Lug 1 Neg. Tie Lug O SO.kK
G Inf 1; 2K Inf 7 . .2

Page 3:

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? John F. Rider

Page 4:

AM Alignment
F Alignment
Set selector swltch on recelver to AM Set tunlng dlal to l6OO ko
Set slgral generator to ,be kc \1th 30? modulatlon at OO c p s
Connect hlgh lde of slgdal generator to pln 7 of 6BE6 through O l mfd
condenser, low slde to Ch&?SlQ Connect output meter to hlgh slde of vol
ume control and chassl
U :ng as low output from swgnal gen rator as posslble, adjust top and
bottom cores of the three AN I F transformers for m3XlUum output
Fully mesh vang condenser and adjust polnter pOS1tlOH to match scratch
mark at lelt on dlal backlng plate
Set recelver and slgnal generator to l OO kc
Move hlgh slde of slgnal generator to antenna tEURPWlH81 through ?OO uufd
condenser Adjust antenna and R F trlmmers for maxlmum output
Adjust osclllator trlmmer at top of large front gang sectlon for maxlmum
output Adjust R F trlmmer at top of large nlddle vang sectlon for max
lmum output
I F Allgnment, USlHg FM Slgnal generator and oscllloscope
Set selector swltch on recelver to FM
Connect hlgh slde of FM slgnal generator through Ol nfd condenser to
pln 1 of CEA6 2nd I F ampllfler Connect low slde to chassls Connect
vertlcal lnput of oscllloscope to polnt A the ground to chassws Connect
horlzontal lnput of oscllloscope to "sync +9PmlU&l, the ground to around
termlnal of slgnal generator, uslng a phaslnc control to compensate for
phase Shlft
Set devlatlon to 200 kc at OO c p s rodulatlon on lO 7 mc Set output
to approxlmately O l volt Set horlzontal sweep selector of oscllloscope
to hcrlzontal ampllfler Adju t both core of ratvo detector coll bot
tom slug for maxlmum amplltude and top slug for synmetrlcal pattern wlth a
llnear center portlon
Move hlgh slde of slgnal generator to pln l of 6BA6 lst I F ampllfler,
USlUE same dummy Set devlatlon to l5O kc Ad u t both cores of 2nd I
transformer for maxlmum amplltude and symmetrw of pattern
Move hlgh slde of SlgH l generator to pwn 2 oi l2AT7 converter tube
uslng same dummy Adjust both cores of lst I F transformer for maxlmum
amplltude end symmetry of pattern
Wlth same slgnal generator connectlon, check dju tment of cores of 2nd
I F transformer Ordlnarlly, readjustment of the ratlo detector cores 1S
unnecessary If the pattern lS not svm etrloal wlth a llnear center por
tlon, the entlre allgnment procedure must be repeated
I F Allgnment, uslng AN slgnal generator and V T V M
set selector SW1tCh on recelver to FM
Connect high slde of slgnal generator to pln
through Ol mfd condenser Connect low slde
lO 7 mo Nlth no modulatlon and set output to
probe of VTVM to pln 7 of (DALE ratlo detector
to chassls bet generator
about O l volt Connect d c
and connect common to chas
sis Adjust bottom core of ratlo detector coll for maxlmum negatlve read
Connect d c probe to polnt A' and adjust top core for zero readlng Re
Connect d c probe to pin 7 of oALb Connect high slde of slgnal gen
erator to p1n l of OBA6 lst IF ampllfler, uS1Hg same dummy Adjust top and
bottom cores of 2nd IF transformer for maxlmum negatlve readlng
eat these two ste s.
?Jdhn F. Rider

Page 5:

Co nect S1gU&1 generator to p1n 2 oi l2Am7 converter, US1DQ same dummy
Adjust top and bottom cores of lst IF transformer for max1mum negatlve
with same s1gnal generator COHH9CtlOHS, re checl core adjustments of 2nd
I* transformer for max1mum negat1ve read1ng
Connect d c probe to polnt "A' and re check for zero read1 g L1tt1e
or no further adjustment of the top core of the rat1o detector co1l should
be necessary If the read1ng lS much off from zero, the ent1re al1gnment
procedure should be repeated
Set selector sw1tch on recelver to FM
Connect h1gh slde of FM s1gnal generator through Ol mfd condenser to
pln 2 of l2AT7 converter Connect low slde to chass1s
Set S1gDal generator and recelver to 108 mc Set devlatlon to 75 mc at
Connect output meter to po1nt "A" and chass1s
Carefully adjust osclllator trlmmer, at top of small front gang sect1on
for maxlmum output, start1ng at m1n1mum trlmmer capaclty and seleotwng the
f1rst response reached
Set S1gH81 generator and recelver to 88 mc Squeeze or spread osclllator
co1l to obtaln maxlmum output
Repeat the above two steps unt1l no further 1mprovement results
Connect h1?b slde of slgnal generator to p1n l of 6AGb RF mpllfler,
US1Hg same dtmmy Set s1gnal generator and TEURCEUR1V r to 108 mc Adjust RF
tr1mmer at top of small center gang sectlon for maX1mum output, FOOk1Ug
Use as low output from slgnal generator as lS
tun1ng d1al sl1ghtlv to compensate Ior osclllator pull1ng Reset osc11
lator trlmmer to match polnter to 108 mc d1a1 scale mark
Set s1gn 1 generator and rece1ver to 88 mc Squeeze or spread RF co11
to obta1n m3X1mhm output, POCklHg tun1ng dlal Repeat RF tr1mmer adjust
ment at 108 mc and coll adjustment at 88 mc untll no further lmprovement
results resetting OSC1llatOP tr1mmer 15 necessary
Connect termlnals of s1gnal generator to antenna termlnals, us1ng a 150
ohm carbon (non 1HdUCt1VEUR) TSSlStOT 1n ser1es wlth each term1nal
Set s1gnal generator and recelver to 108 mc Adjust antenna trlmmer, at
top of small rear gang sect1on for max1mum output
Set slgnal generator and recelver to 88 mc Squeeze or spread antenna
coll secondary for m&X1mUm output Repeat last two steps unt1l no further
lmprovement results
AM reception 15 O%t&lHEd by turnlng the selector sw1tch counter clock
w1se to the AM positlon The tun1ng knob 1S rotated to select statlons
Proper tunlng 1S 1nd1cated by m3X1mUm C1OSlng of the tun1ng eye
FM recept1on lS obta1ned by turn1nv the selector swltch to the FM poslt
*on Tuning is 8CCOmp11ShSd as for AM, normally, three po1nts of recept
ion close together N111 be observed on FM statlons The correct po1nt for
reception 1S the center one, as lndlcated by the tunlng eye
Phonograph operation is obtalned by turn1ng the selector sw1tch clock
wise to the phono pOSlt1OH and operatlng the automatlc record cranger ac
cording to wnstructions
Bass boost lS obtalned by rotatlng the bass control counterc1ockw1se
Treble suppression is obtalned by rotatlng the treble control counter clock

Page 6:

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(C)J?hn F. Rider

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