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Philco 70 If transformer question
Ron Ramirez
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Posts: 13,776
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City: Ferdinand State, Province, Country: Indiana
#7

12-25-2021, 08:04 PM
Keep in mind that in 1931, the typical voltmeters used to make the voltage measurements at the factory had an input impedance of 1000 ohms/volt, which loads down the circuit under test and produces false readings. Only they did not know this at the time.

In other words, voltage readings taken under identical conditions today (110 or 115 volts AC input, depending upon published specs) with a DMM or a good VTVM will be higher than Philco's published voltage readings.
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Ron Ramirez
Ferdinand IN
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Messages In This Thread
Philco 70 If transformer question - by radio1 - 12-16-2021, 07:29 PM
RE: Philco 70 If transformer question - by morzh - 12-16-2021, 07:51 PM
RE: Philco 70 If transformer question - by radio1 - 12-16-2021, 07:52 PM
RE: Philco 70 If transformer question - by radio1 - 12-21-2021, 08:45 PM
RE: Philco 70 If transformer question - by radio1 - 12-25-2021, 07:53 PM
RE: Philco 70 If transformer question - by Ron Ramirez - 12-25-2021, 08:04 PM
RE: Philco 70 If transformer question - by radio1 - 12-25-2021, 08:34 PM
RE: Philco 70 If transformer question - by radio1 - 12-31-2021, 09:31 PM



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