This amplifier has a few Watt output, using old transistors. The speaker is 45 ohms, but with modern transistors like the pair BD135 and BD136 you can get more power with an 8 ohms speaker. The supply is made with 5 or 6 V and changes of resistors may be necessary in case the silicon transistors are used. The first 2N217 can be replaced by BC558. The circuit is from a 1973 publication.
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