I am tracing the circuit of a push-pull 6v6 amplifier from a Webcor 129 console and the output transformer is throwing me for a loop. In addition to the two expected secondary leads going to the speaker, there are three other leads coming off the secondary - one connected to cathode #1, one connected to cathode #2, and one connected to a power resistor which then goes to ground. I presume this arrangement biases the output tubes and provides some sort of feedback, but I've never come across anything like it before. Am I interpreting this correctly?
Also, the power transformer seems to be missing the center tap lead. I have reason to believe it may be grounded to the chassis inside the bell cover, however. Is this a possibility on a mass-market set?
Thanks in advance for any guidance.
-Nick
Also, the power transformer seems to be missing the center tap lead. I have reason to believe it may be grounded to the chassis inside the bell cover, however. Is this a possibility on a mass-market set?
Thanks in advance for any guidance.
-Nick
Also, the power transformer seems to be missing the center tap lead.
A CT is not needed, when the PSU employs a bridge rectifier or a voltage multiplier.
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