krakauer page 8-2 model electone piano service ilotes krakauer bros. amplifier circuits: the output...
TRANSCRIPT
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KRAKAUER PAGE 8-1
Schematics IDDEL Electone Piano Fick-up Connections KRAKAUER BROS. Preajli fier,Power Amplifier
USE GLASS TUBE ONLY FOR NIGH /N5ULAT/ON
TO PICKUP Í- SCREWS .1 MF .1 MF
ON PIANO
PRESET MAX. VOL: 70 AVOID
OVERLOAD
6K5G
3
USE ONLY BEST PARTS ANO SUSPECT - TH/S GROUP FOR CAUSING STAT/C LIKE NOISE - INSULATION MUST BE PERFECT - /00 MEGOHMS LEAKAGE - OR MORE
TO RAME O/V PIANO
FIL. -
MASTER VOL. CONTROL
SWELL PEDAL
6C5
SO M`." SO M`"'
8MF 450V. T
TONE CONTROL OMITTED
PREAMPLIFIER "ELECTONE " PIANO BU/LT BY DAVID BOGEN CO., /NC. 9-30-37
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PICKUP CONNECTIONS 'ELECTONE' PIANO
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POWER AMPLIFIER "ELECTONE" PIANO MADE BY DAV/D 50G5N CO., INC. 40 WATT INVERSE FEED BACK
FIXED B/AS 9-30-37
F/L.
EXTERNAL GRO UNO
/F NECESSARY
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©John F. Rider, Publisher
www.americanradiohistory.com
KRAKAUER PAGE 8-2
MODEL Electone Piano Service Ilotes
KRAKAUER BROS.
AMPLIFIER CIRCUITS: The output transformer is especially designed and if it is
placement is necessary. The tone control is subject
Some forms depend on the cathode with exact value.
Use only glass tubes in the input, as the leakage is less,
the output, beoause of the possibility of a short to the shell.
damaged, an exact re-
to wide variations according to individual requirements by-pass for control; therefore, replace this component
and only glass tubes in
NOISE ELIMINATION: First suspect dirt on the pick-up screws. These are insulated with lacquer, but
this is not perfect. Clean with a vacuum -cleaner with blower attachment, which should be run for a few minutes so that the hose will be free from dirt. A thin strip of paper can be worked between the strings and the pick-up screws to remove stubborn particles of dirt.
Moisture may get into the wooden strip supporting the pick-up screws. This can be dried by placing in the bottom of the piano a 2 pint fruit jar which is 1/3 filled with calcium chloride. This should be renewed when it disintegrates. When the strip is dry it should be oiled with Nujol.
Another source of noise may be leakage in the input group (the two 10-megohm resis- tors and the .1-mf condenser). Replace with the best components obtainable. In severe. climates place these three components in a small cardboard pill -box and fill it with paraffine wax, bringing out the leads so they can be readily connected to their proper points.
HUM: Hum may be due to trouble in the filters, unmatched output tubes, or a poor bias
rectifier, if trouble is confined to the amplifier.
Electrostatic pick-up to screws is shielded by the back -board of the piano. This board must make good contact with the ground clamps. If proper contact can not be
established, cover the back -board with tin -foil shellaced in place and grounded.
REGULATING PICK-UP SCREWS: This must be done with the help or a professional piano tuner who must be a tone
regulator. The tuner should tone regulate the piano very soft, paying attention to eveness of tone and not eveness of volume. Then he oen strike the notes, telling the serviceman at the rear of the piano, if the pick-up screws need adjustment. Turn screws to right to make louder -- to the left to make sorter. Take care that screws are not turned too far to the right, so that the strings will touch screw when a very hard blow is struck on the key.
These screws should ordinarily need no attention during the life of the piano. Only in case of buckling of the mechanism or tampering need these be touched.
SETTING MASTER LEVEL CONTROL: The striking of the hammer on the strings sets up tremendous transients in the elec-
trical circuit which last a small fraction of a second. These tend to overload the amplifier and when the average output of the amplifier is 3 or 4 watts, the transients may be of the order of several hundred watts. Accordingly, a 40 watt amplifier is used for low average power. Do not set the screw -driver type volume control too high. The instrument is not supposed to sound much louder than an ordinary acoustic piano.
Overload causes rattling similar to speaker cone rattles. Do not blame the speaker until you are sure.
SWELL PEDAL ADJUSTMENT: The mechanical connection from the swell pedal to its control should be set so
that with the pedal completely depressed, the sound from the speaker is just not notice- able.
NOTE: Special parts and further service information may be obtained from Krakauer Brothers,
191 Cypress Ave . , New York City.
©John F. Rider, Publisher
www.americanradiohistory.com
LAFAYETTE PAGE 8-1
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AGE 8-2 LAFAI ETTE
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LAFAYETTE PAGE 8-3
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www.americanradiohistory.com
PAGE 8-4 LAFAYETTE MODEL A18 MODEL C25 Schematics
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LAFAYETTE PAGE 8-5
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PAGE 8-6 LAFAYETTE MODELS D30,D31 YODEL .M31(1935) Schematics
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www.americanradiohistory.com
LAFAYETTE PAGE 8-7
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©John F. Rider, Publisher
www.americanradiohistory.com
PAGE 8-8 LAFAYETTE
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©John F. Rider, Publisher
www.americanradiohistory.com
LAFAI"I:TTE PAGE 8-9
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www.americanradiohistory.com
PAGE 840 LAFAYETTE
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