2 Tube 1 1/2 watt AC/DC Amplifier
Reviewed by: Kylie
On: 25 Okt, 2018
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Because of its greater gain, this amplifier is capable of fair volume with any type crystal phonograph pickup or radio tuner. It delivers up to 1 1/2 watts output, which is about alll average 3" speaker can handly. The amplifier is of the AC/DC ty...
Because of its greater gain, this amplifier is capable of fair volume with any type crystal phonograph pickup or radio tuner. It delivers up to 1 1/2 watts output, which is about alll average 3" speaker can handly. The amplifier is of the AC/DC type and features an inverse feedback network to improve fidelity, and a tone control. As is true of all amplifiers shown, the power switch can either be a seperate toggle, rotary or push type switch, or push type switch, or it may be attached to the volume or tone control, according to the desires of the constructor.
There should be no particular problem in getting the completed amplifier to operate properly. If the amplifier has a tendancey to "howl" or oscillate, reverse the connections to the secondary i.e voice coil, side of the output transformer. This amplifier will make a very compact unit, especially since no filter choke or power transformer is used.
C-1 .01 mfd 400 V. paper cond.
C-2 .05 mfd 400 V. paper cond.
C-3 .02 mfd 400 V. Paper cond.
C-4 .02 mfd 600 V. paper cond.
C-5 10 mfd 25 V. elec. cond.
C-6 .02 mfd 400 V. paper cond.
C-7 20 mfd 150 V. elec. cond.
C-8 20 mfd 150 V. elect. cond.
R-1 2500 0hm 1/2 watt res.
R-2 500,000 ohm Vol. control
R-3 100,000 ohm tone control
R-4 250,000 ohm 1/2 watt res.
R-5 500,000 ohm 1/2 watt res.
R-6 235 ohm 10 watt res.
R-7 150 ohm 1 watt res.
R-8 100 ohm 1 watt res.
R-9 200 ohm 2 watt res.
R-10 25,000 ohm 1/2 watt res.
T output trans:2000 ohm to voice coil
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3. Earth ground
6. V1 heater connection
7. Line level audio in
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