Model 20 speaker or model 70 ?

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Model 20 speaker or model 70 ?

Danny
Member

Posts: 64
Threads: 22
Joined: Oct 2006
City: Acworth State, Province, Country: GA

#1

12-01-2007, 10:27 AM

Got my 2nd model 20 working somewhat but volume is a bit low. Ok lets
look at the plate voltages on the two 71's. Yep, there it is...no voltage on one of the plates.
Bad output transformer ? Wait a second, why is there only three wires on this speaker plug ?
Did some checking and from the tech
section on this great site I find "The Speaker Problem in early Philco
Cathedrals ". With this info and my Fluke 23 I find that I've got
445 ohms on the output trans primary side. Now couple this with the only 3
wires from plug I'm wondering is it possible. Do I have a model 70 speaker
with a model 20 chassis ? Anyone have a model 20 spkr they want to trade for a model 70 ?

Danny

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Messages In This Thread

Model 20 speaker or model 70 ? - by Danny - 12-01-2007, 10:27 AM

[No subject] - by Ron Ramirez - 12-01-2007, 11:01 AM

[No subject] - by Steve Davis - 12-01-2007, 11:02 AM

[No subject] - by Danny - 12-01-2007, 01:02 PM

[No subject] - by Ron Ramirez - 12-02-2007, 12:37 AM

[No subject] - by Danny - 12-08-2007, 02:09 PM

[No subject] - by Ron Ramirez - 12-08-2007, 04:23 PM

[No subject] - by Danny - 12-09-2007, 04:27 PM

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