3 Tube 2 Watt Economy AC/DC Amplifier
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On: 30 Okt, 2018
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The feature of this AC/DC amplifier is its low cost due to the small number of parts used. It is quite suitable for phonograph reproduction with good gain capabilities from a less sensitive pickup. With the arrangement shown for biasing the two am...
The feature of this AC/DC amplifier is its low cost due to the small number of parts used. It is quite suitable for phonograph reproduction with good gain capabilities from a less sensitive pickup. With the arrangement shown for biasing the two amplifier tubes, it is possible to ground the cathodes of the tubes directly, eliminating the need of cathode resistors and condensers.
The Bias Cell provides essensial grid bias voltage to the L2SF5 tube when connected in the proper manner-shell of bias cell to grid terminal. Bias for the 50L6GT tube is obtined from the divider network R-4 and R-5, connected across the speaker field. This method of biasing provides a slightly higher plate vo;tage to be effective on the power tube, consequently increasing its power output.
It should be noted that the two filter condensers do not have their negative leads connected to the same point, so if it is intended to use a dual filter unit in the construction of this amplifier, one should not be obtined with a common negative lead.
C-1 20 mfd 150 V. elec. cond.
C-2 .01 mfd 400 V. paper cond.
C-3 .01 mfd 600 V. paper cond.
C-4 .02 mfd 400 V. paper cond.
C-5 20 mfd 150 V. elec. cond.
R-1 1 meg ohm volume control
R-2 250,000 ohm 1/2 watt res.
R-3 250,000 ohm 1/2 watt res.
R-4 35,000 ohm 1/2 watt res.
R-5 100,000 ohm 1/2 watt res.
J Phonograph jack
B Bias cell 1 1/2 volt
L 450 ohm speaker field
T Output trans:2000 ohm to V.C
SW SPST switch on volume control
Sockets: 3 octals
C-6 .1 mfd 200 V. paper cond.
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3. Earth ground
6. V1 heater connection
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