Welcome Guest! Be sure you know and follow the Phorum Rules before posting. Thank you and Enjoy! (January 12, 2025) x

Thread Closed

Newbie Model 71 questions
#1

For my first restoration attempt, I have a Model 71-121 but I’m not a radio guy. It looks like this has been partially recapped in the past (anyone recognize those colorful speaker wires?) with components wired point-to-point and sometimes to the Bakelite blocks, which were not unstuffed but several caps are just handing with unattached connections. Pics, schematic and parts list are all here http://chronology.weebly.com/philco-71.html

My plan is to empty all the Bakelite boxes (done) and replace the necessary caps onto lugs, and add insulation and a line fuse. Then move on to tubes before powering up for the first time with dim bulb tester.

My questions are these: 

Are there any critical wire lengths that I shouldn’t alter as I clean up and rewire?

Part  (21) Filter Condenser Bank ( 2x0.05u, 1x0.25u)  04731 appears to be missing. Three caps numbered (21) appear on the schematic but I don’t know which of them is the 0.25u.

Part (7) 0.5u Number 3583 not present on the chassis. 

Part (38) 3903AA  and line filter caps (49) are also missing also missing but I can work around those.

The tone control (39) appears to have an integrated cap but the schematic shows no value. Any suggestions? 

Anything else you spot? Any other warnings, hints, suggestions? Thanks very much.


Messages In This Thread
Newbie Model 71 questions - by gmg - 03-13-2017, 07:43 AM
RE: Newbie Model 71 questions - by TV MAN - 03-13-2017, 02:37 PM
RE: Newbie Model 71 questions - by Radioroslyn - 03-13-2017, 03:42 PM



Users browsing this thread: 1 Guest(s)
[-]
Recent Posts
under chassis parts locator diagram for 1938 Zenith 9s262
Has anyone gone to the trouble of creating an under chassis parts locator image?  Yes, I can identify components by foll...bobloney — 08:57 PM
Plug Voltages Needed For A 1943 CRV-20130 Power Supply
Try looking at this site the book mark is for a old generator that I was given. David    https://radionerds.com/index.ph...David — 08:36 PM
Plug Voltages Needed For A 1943 CRV-20130 Power Supply
Hello Everyone, I am looking for voltage identification for all the pin positions on the socket of a CRV-20130 power su...Tonym4704 — 08:16 PM
Philco P45-6365 Universal Transformer Instruction Manual
Can anyone guide me to where this may be found?GRG — 03:00 PM
54C Complete Teardown/Rebuild
I don't think that I have encountered a 12Z3 before, curious how it uses one of those but includes a #43, which is a 25 ...Arran — 02:17 PM
HiFi (Chifi) tube amp build - but my own design.
It's the other forum. I'm also in DIY, but mostly read there. Honestly, I kinda jumped into this without much thought to...TV MAN — 10:43 AM
Philco 71 Code 125
Hello,  I am in need of a schematic for this radio. Mine has the three separate circular tube shields and a shadow me...dconant — 08:06 AM
Stromberg Carlson 1500 Squeal
And life just keeps getting more complicated.dconant — 07:57 AM
54C Complete Teardown/Rebuild
Hello Roy, here is this one sincerely Richardradiorich — 12:45 AM
54C Complete Teardown/Rebuild
Richard, Had grabbed it already but thank you just the same.  I find myself wanting to find some way to block out the...glyphmon — 12:03 AM

[-]
Who's Online
There are currently 2012 online users. [Complete List]
» 1 Member(s) | 2011 Guest(s)
Avatar

>