Model 20 speaker or model 70 ?

Register

Guest Join Us

Hello Guest,

Please feel free to join us!
There are many more parts of the Phorum that only members can see.

Welcome Guest! Be sure you know and follow the Phorum Rules before posting. Thank you and Enjoy! (January 12) x

Thread Rating:

0 Vote(s) - 0 Average
1
2
3
4
5

Linear Mode

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

Find

« Next Oldest | Next Newest »

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

View a Printable Version

Users browsing this thread: 1 Guest(s)

Recent Posts
Philco Model 38-7: what caps & resistors do fail typically?
Since you stated earlier, you have a console 38-7XX. They also had a 38-7T (table), and 38-7CS (chairside). A very nic...GarySP — 01:18 PM
Part numbers to model cross
That I wouldn't know, but sometimes the radio document itself shows one, same as the capacitor cans' etc pinouts.morzh — 12:46 PM
Part numbers to model cross
Thank you morzh, that is exactly what I was looking for. Now , is there some where that shows pinouts for Philco power ...Jim Dutridge — 11:37 AM
Restoration of the Canadian General Electric A-87
Thanks for your help Michael. In fact, this video is only an intermediate result. Later I had to apply another tinting l...RadioSvit — 09:01 AM
Restoration of the Canadian General Electric A-87
Great job on the cabinet. PS. In the US notation, "kenotron" refers to specific type of tubes; we call re...morzh — 08:24 AM
Part numbers to model cross
This document has at least some tables of models and parts used. Example: Choke 32-7572, used in 604 radio. Search f...morzh — 08:19 AM
Restoration of the Canadian General Electric A-87
I also checked all the radio tubes on my Hickok 530 tube tester. The 5Z3 kenotron turned out to be faulty, all the other...RadioSvit — 08:02 AM
Restoration of the Canadian General Electric A-87
Well... While the varnish is drying up, I started repairing the chassis... Of course I started by replacing the pa...RadioSvit — 07:12 AM
Philco Model 38-7: what caps & resistors do fail typically?
Hello Martin, Welcome aboard our little community what great Model 38-7 Sincerely Richardradiorich — 12:30 AM
Philco Model 38-7: what caps & resistors do fail typically?
Welcome to the Phorum Martin. I count about 9 paper caps, the 3 electrolytic caps and 2-Y2 safety caps to replace th...RodB — 09:44 PM

Who's Online

There are currently 1381 online users. [Complete List]
» 1 Member(s) | 1380 Guest(s)