Thread Rating:
  • 0 Vote(s) - 0 Average
  • 1
  • 2
  • 3
  • 4
  • 5

Model 90 w/ one 47 tube cap question
#1

Hi guys.  Working on model 90 with the single 47 tube.

https://philcoradio.com/library/download...l.%201.pdf

All bakelite blocks are rebuilt and have opened up part #30, Condenser block with  254k and 105k caps. In the attached pic it looks like 3 caps?  3 wires plus the ground to the tin can. I'm unsure how these are replaced. Did Philco use two caps for the 1 mfd which would be the 2 on the bottom and the 254k on top?  
   
#2

Paul

Unfortunately, you've been caught by the error in the Model 90 schematic with a single 47 output tube. This error is described at the following link:

https://philcoradio.com/library/index.ph...info-1-47/

Capacitor bank (30) actually has three capacitors inside - 0.1 uF (104K), 0.25 uF (224K or 254K), and 1 uF (105K).

If your original part (30) still has its original wire colors, you will see that one end of the 0.1 uF goes to the green wire; one end of the 0.25 uF to the white wire; and one end of the 1.0 uF to the black wire. The other ends of the three caps are tied together and connected to the can via the skinny ground wire.

When you get to can (24), you will likewise find it has but three caps inside (instead of four), All three are 0.25 uF.

A corrected schematic showing the proper part numbers may be found here:

https://philcoradio.com/library/images/schem/90b.jpg

--
Ron Ramirez
Ferdinand IN
#3

My gosh. Thank you very much Ron!

Paul




Users browsing this thread: 1 Guest(s)
[-]
Recent Posts
Philco 91 Speaker Replacement
The spider is glued on the cone and so is the voice coil. I think you can use a cotton swab dipped in acetone and carefu...RodB — 02:42 PM
Restoring Philco 37-604C
Yes I saw that. If I knew, I'd probably try to arrange for getting it myself. But I have just got one. Which does not m...morzh — 01:44 PM
Philco 38-2 Automatic Tuning
When you push the lever, you are supposed to rotate the disk to the desired station. Then the magnetic tuning will acqu...morzh — 01:42 PM
Philco 38-2 Automatic Tuning
I figure out the muting from another picture that helped. Now I need to know how the automatic tuning works. When I push...dconant — 12:11 PM
Philco 91 Speaker Replacement
How would I go about removing the spider from the cone?dconant — 12:04 PM
Philco 38-2 Automatic Tuning
Hello, I am having trouble getting my automatic tuning to stay unmuted. If I play with the tuning handle I can get it to...dconant — 10:51 AM
Does anyone make photofinish replacements?
Here’s the link to the DIY photofinish section of our site: klondike98 — 09:46 AM
Delco car radio Peko vibrator converstion issues
Hi Richard, Thx for posting the schematic.  As I remember as a kid, these were great performers for the time, likely...MrFixr55 — 08:56 AM
Delco car radio Peko vibrator converstion issues
hello mr Fixr, The Electro  Powersupply that I am powering the radio with has a huge choke plus a 10,000ufd electrolyti...radiorich — 10:58 PM
Delco car radio Peko vibrator converstion issues
How about putting a choke in the power supply? The big cap was likely an attempt to stabilize the DC. Kids who cre...MrFixr55 — 09:19 PM

[-]
Who's Online
There are currently 2859 online users. [Complete List]
» 1 Member(s) | 2858 Guest(s)
Avatar

>