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38-690 questions
FStephenMasek
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Posts: 234
Threads: 43
Joined: Mar 2008
City: Mission Viejo, CA
#7

01-27-2009, 01:49 AM
I replaced the 2,500 ohm field coil speaker in a little 4-tube TRF with a 1,500 ohm speaker in series with a 1,000 ohm resistor, and it works fine. There is a discussion of this on the Antique Radios Forum, and one guy there has a 450 ohm speaker on his bench for testing, and just uses different series resistors to match it to the particular set he is testing.

You are fortunate to have a 38-690.
Web site: http://www.masekconsulting.net
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Messages In This Thread
38-690 questions - by Guest - 01-19-2009, 12:22 PM
Re: 38-690 questions - by codefox1 - 01-19-2009, 03:42 PM
Re: 38-690 questions - by Doug Houston - 01-19-2009, 04:41 PM
Re: 38-690 questions - by Steve D - 01-19-2009, 06:25 PM
Re: 38-690 questions - by Arran - 01-19-2009, 11:15 PM
Re: 38-690 questions - by Fred R - 01-20-2009, 10:53 AM
Re: 38-690 questions - by FStephenMasek - 01-27-2009, 01:49 AM
Re: 38-690 questions - by Doug Houston - 01-27-2009, 11:06 PM
Re: 38-690 questions - by Arran - 01-28-2009, 04:02 AM
Re: 38-690 questions - by 49Stude63 - 02-01-2009, 01:01 PM



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