Clauscorrector II. Stabilized tube preamp power supply (300 volts 50 milliamps + 6.3 volts 3 amps). Encyclopedia of radio electronics and electrical engineering
Encyclopedia of radio electronics and electrical engineering / Tube Power Amplifiers
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A simplified version of the Clauscorrector I in a two-block housing. The amplifying part itself repeats the clauscorrector I. Structurally, each block is an instrument box 180*240*100mm. Chassis board and front panels changed to 2mm brass. Here is such a cable salad under the chassis of the amplifier -
The power supply, in order to reduce the cost of time relays, etc., is made on a kenotron rectifier. 330V, 50mA and up to 3A of incandescent current are supplied to the load (one stabilized channel). In the amplifier block - an additional 120 microfarad filter (MBGO).
(click to enlarge)
- Option 1. The discrete current source (R4-R6, T2-T3) can be replaced by a 2-pin current source (Motorola 1N5294-1N5309).
- Option 2. Current source - we exclude, the circuit becomes a "capacitance multiplier"
The layout of the ground on the printed circuit board repeats what is shown in the diagram - there are two independent ground tracks on the PCB (not a star). The star is organized on the chassis, directly next to the output connector of the block (RP10-9) - the anode and filament earths, the screen and the negative output of the anode source are planted on it.
(click to enlarge)
With such switching, there is only one earth conductor (the filament current does not flow through it). The shield is not connected to the preamplifier chassis, only to the power supply chassis. Electrical contact between the PSU chassis and the preamplifier is not allowed.
Here is a sketch of the printed circuit board and its location in a case measuring 180 * 240 * 100 mm. TP125 power transformer and choke from Electron-Complex.
Power transistors in a fully insulated case are sandwiched between the board and the radiator - a piece of a corner 25 * 40 mm (in my version, the dissipation power is not more than 5W).
Publication: klausmobile.narod.ru
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