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

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

Philco 90 restoration
#1

Thanks to Chuck S. I got the service literature for the 90 yesterday. Today, I finished the recap and changed all out of tolerance resistors, save one, a 240K ~3 watt. I don't have any of those in my current inventory. I found some doozies, too. Out of the three 240K resistors in the audio circuit, two were well over 700K, one was virtually open. The two 490K resistors in the detector circuit were both well over 4M!


Attached Files Image(s)
   
#2

Glad to help Brenda. S-l-o-w mail it seems.

Don't for get to re-stuff that tone control. Looks original in the photo.

Icon_smile

Chuck
#3

Well that's why I started the Recarb and Recap School of Everlasting Rejuvination. Few followers so far.
#4

This is the same tone control (or similar) we have in 18.
Not only it has rubber wires, which cracked, so I had to splice them, it is also potted.
I actually left it alone. Did not have it in me. This is one single thing in the whole 18 that I did not restuff.
#5

The higher the value the higher they drift!!!
Terry
ps WHAT CUTE LITTLE RESISTORS YOU HAVE THERE!!!
#6

All flameproof, all the same or higher power rating than the originals. Icon_smile
#7

It is amazing but today's 1W resistor is about 1/4 size of then 1W resistor.
What bad is that sometimes the leads are not long enough to span the old resistor and so the old one gets cut and then the new one gets soldered to them.
#8

Yes, it would be nice if the powers that be would lengthen the leads about an inch. It's not like it would make a substantial difference in their profit margins.
#9

It could. It's copper. Copper. Copper is expensive. I am sure one lead of a power through-hole resistor is worth more than a whole 1206 SMT chip resistor.
#10

Hi All;
Brenda Ann, You could use an 1206 SMT and make the leads as Long as You like.. Soldering a lead to each side of the unit..
THANK YOU Marty




Users browsing this thread:
[-]
Recent Posts
Philco 42-345 Restoration/Repair
In some cases the old paper caps can be replaced with ceramic caps, with values such as .001 uf, .005 uf, .01 uf, and ma...Arran — 06:50 PM
1949 Motorola 5A9M
Vlad; I would tend to agree, I only suggested the loop antenna connections since he was already looking at the end of...Arran — 06:18 PM
Philco 42-345 Restoration/Repair
Rod thank you for helping to understand the paper caps and offering the bumblebee caps. I have already ordered film caps...osanders0311 — 03:55 PM
1949 Motorola 5A9M
Bob, this is the wrong sequence to look for problems and setup circuits. Always start checking the signal path from the...Vlad95 — 12:19 PM
Philco J1720 stereo and record player with reverb
The above link takes you to the Delaware Valley Historic Radio club. They are not too far from you and may have sugg...klondike98 — 11:49 AM
Tucker Movie Prop car
Richard: Did you ever check with your friend? About once a year I try to verify if Mr Rhoades really worked on the r...WrenchMonkey — 09:22 AM
Philco J1720 stereo and record player with reverb
>>when turning the knobs This is very broad. There are knobs for tuning and knobs for volume, and possibly f...morzh — 07:36 AM
1949 Motorola 5A9M
Thx Arran, I will check the antenna connections. Right now the loop is alligator clip connected to the chassis since you...klondike98 — 03:58 AM
1949 Motorola 5A9M
Bob; I was just thinking that maybe the 1R5 tube doesn't like being operated at 1.2 volts on the filament, though you...Arran — 12:56 AM
Philco J1720 stereo and record player with reverb
So I just purchased a Philco J1720 stereo and record player. That has some static when turning the knobs. Wanted to see ...PhilcoJ1720 — 12:26 AM

[-]
Who's Online
There are currently 1107 online users. [Complete List]
» 2 Member(s) | 1105 Guest(s)
AvatarAvatar

>