7
CAUTION
The amplifier must be installed in such a way that free flow of hot air from the tube is
allowed. The amplifier must not be installed in a constrained surrounding (i.e. tight
shelves etc.). During extended operation the tube ventilation grid can reach high
temperature. Do not touch it!
The amplifier must be properly grounded during operation.
During operation the amplifier must be installed in such a way that the rear side remains
accessible.
The amplifier is an A category product. In a household it can influence other electric
appliances. In such cases the user is to take proper actions to mitigate this disturbance.
Read this manual carefully. Fallow all of instructions during installation and operation to
avoid damage to the amplifier not covered by manufacturer´s warranty! Do not attempt
to perform any change of hardware or software!
3. GENERAL DESCRIPTION
3.1. HF Compartment
his amplifier is using a par of ceramic tetrode FU-728F in a grounded-cathode circuit
(input into control grids). The OM4001A amplifier achieves excellent linearity by the
voltage stabilization of the control grid bias and the screen voltage. The power input is fed
to the control grids, using a broadband input circuit with an input impedance of 50 Ohms.
This adaptable input circuitry ensures a good input SWR (better than 1.5 : 1) on all amateur
bands.
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