Marconi TF995A &
TF 995A & TF 995A/1 FM AM Signal
Circuit Diagram, Service
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|Marconi TF995A & TF995A/1 FM AM
Signal Generator Type TF 995A is a.c. mains operated and transportable.
This generator has a
crystal standardized frequency range covering from 13.5 to 216 Mc/s in four
Its open circuit output level is variable in 1db steps, from a
minimum of 0.1 micro volts to a maximum of 100 mV at 52 ohms and 200 mV at 75 ohms.
The output may be c.w, frequency modulated, amplitude modulated, or
simultaneously both frequency and amplitude modulated.
|The modulation obtained either from an internal 1,000-c/s oscillator or from an external source, is variable to
maximum frequency deviations ranging from 25 to 600 kc/s for f.m. and to depths up to
5% for a.m.
A full-wave rectifier provides all d.c. h.t. requirements; in the case of the reactor
and r,f. oscillator valves the h.t. is neon stabilized.
The primary of the
transformer is tapped to allow for operation from 100 to 150 volts or 200 to 250
R.f. filtering is introduced into the a.c.
As a Download
|The Information Consists
The Manual contains all circuits for the : -
Marconi FM AM Signal
MAINS INPUT ARRANGEMENTS
Supply voltages, 200 to 250 volts
Supply voltages, 100 to 150 volts
SWITCHING ON AND WARMING UP
CONNECTING TO EQUIPMENT UNDER TEST
The Crystal Calibrator and its use in standardizing the frequency scale
Use of the incremental tuning dial
SETTING UP FOR C.W. OR MODULATED OUTPUT
Simultaneous Frequency and Amplitude Modulation
R.P. OUTPUT ARRANGEMENTS
Outputs from 1 uV to 100 mV at 52 and 75 ohms
Outputs from 2 uV to 200 mV at 75 ohms only
Outputs from 0.1 uV to 10 mV at 52 and. 75 ohms
Output in terms of voltage developed across an external load
Matching to external loads other than 52 or 75 ohms
Matching to balanced loads
SYNCHRONIZING - SIGNAL
REPLACEMENT OF VALVES AND CRYSTALS
ACCESS TO ENCLOSED SUB-ASSEMBLIES
Mains Input Filter Unit
REPLACEMENT OF COMPONENTS OF SPECIALLY SELECTED
SCHEDULE OF TESTS
Accuracy of the R.F. Output Voltage
Deviation Range Adjustments
Deviation Monitor Circuit
VALVE REPLACEMENT DATA
COMPONENT LAYOUT ILLUSTRATIONS
SPARES ORDERING SCHEDULE WITH CIRCUIT REFERENCES
BLOCK SCHEMATIC DIAGRAM
COMPLETE CIRCUIT DIAGRAM
DECIBEL CONVERSION TABLE
As a Download
|If your model is the TF 995A it
will have a valve line up as below
If it is the TF
995A/1 it has
an extra valve a 12AT7 double triode
Six: Type EF95 Pentodes.
Two: Type 6AK6 Pentodes.
One: Type 6AU6 Pentode
One: Type QS15O/15 Voltage Stabilizer.
One: Type 5Z4G Full Wave Rectifier,
One: Type D77 Double Diode.
|If your model is the TF 995A/5 it will have a valve line up as below
Six; Type 6AK5, Pentodes.
One: Type 6AK6, Pentode.
One: Type 6AL5, Double Diode.
One: Type 6AU6, Pentode.
One: Type EF86, Pentode.
Two: Type 12AT7, Double Triodes.
One: Type 5Z4G Full Wave Rectifier.
One: Type OA2, Voltage Stabilizer.
One: Type 5651, Voltage Stabilizer.
| Marconi TF995A FM
AM Signal Generator 1954 vintage and TF995A/1 1955
For the TF995A/5 a later 1960 model Click Here
Manuals are Available Worldwide as a
Manual including circuit
Manual 95 A4 pages worldwide
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