1. The PHILCO Phorum
  2. Philco Radio Discussions
  3. Philco Electronic Restoration
Thread Rating:
  • 0 Vote(s) - 0 Average
  • 1
  • 2
  • 3
  • 4
  • 5

Threaded Mode
Philco 38-12
radiola
Member
***
Posts: 64
Threads: 10
Joined: Dec 2010
City: Baltimore, MD
#31

05-21-2011, 11:23 PM
Okay, there was light at the end of the tunnel. For one thing, I used two resistors, one 1k, one 500 ohms. Put them together wrong way, side by side. Sometimes when I'm tired it's best to drop things and walk away. So, starting fresh today, it's the first thing I noticed! So, used 1500 ohms, 10w resistor (total) to replace field coil. To reduce the hum, had to use 22 uf primary electrolytic cap, and 8 uf secondary cap. Humming problem is over!! Did some adjusting of the I.F. cans and padders again, and it is now working well. Thanks for all the help, Terry. As always, it was much appreciated!!!
Find
« Next Oldest | Next Newest »




Users browsing this thread: 2 Guest(s)
[-]
Recent Posts
Philco Model 80 Transformer resistance
The DC resistance of the primary is 8 to 9 Ohm.morzh — 07:54 PM
Philco Model 80 Transformer resistance
I have a feeling the primary winding on the power transformer is bad. My resistance reading on the primary side is 9 ohm...Mike L — 07:48 PM
Rusty Tuning Condenser
I would try Naval Jelly and use a soaked pipe cleaner to get it where it needs to go.RossH — 06:56 PM
38-10T chassis Restoration begins
Hello Dconant , they sold mica to use as a insulator between transistors and their heatsinks too. Rob I will remove th...radiorich — 02:52 PM
38-10T chassis Restoration begins
Thanks for the info guys. I always wondered why the use of mica. Now I know.dconant — 01:52 PM
38-10T chassis Restoration begins
Most common plastics have a dielectric constant in the 3-4 range whereas mica is around 6. This means that even if you w...Steve D — 01:46 PM
38-10T chassis Restoration begins
It is acceptable but not desirable. Plastic is not an approved cap dielectric, and even though a reasonably thick piece...morzh — 11:52 AM
38-10T chassis Restoration begins
I have a question about the mica sheets. I thought I saw somewhere on the Phorum where someone used thin plastic report ...dconant — 10:44 AM
38-10T chassis Restoration begins
Yes, you should carefully remove the mica sheets from the trimmers otherwise you risk trapping foreign material in the t...RodB — 10:34 AM
American Bosch Model 802 auto radio
Hi Joe, Thank you again. The American Bosch Model 634A has the same tube lineup as my Model 802 and the parts layout dia...Antipodal — 03:09 AM

[-]
Who's Online
There are currently no members online.

>
  1. The PHILCO Phorum
  2. Philco Radio Discussions
  3. Philco Electronic Restoration