Philco 66 - Sweet Music at Last!!
Posts: 1,562
Threads: 56
Joined: Nov 2008
City: Sedona, AZ/Placentia/CA
Joe, really need to get the audio amp section working well before chasing signals from the antenna or injection of signals from your generator. Particularly if your working without a scope. If your using the speaker output to do things and the amp is not working properly, well, it's like working in the dark. Tone insertion on the control grid of the output tube and the first audio seem to be the next phase as was indicated earlier. You will be after the volume control so keep the generator audio gain down low. Hate to see you put a large signal in and launch your speaker cone. Needless to say, you also need to confirm the voltages on the two tubes. Something is wrong in the audio if your not getting a hum out while touching the center tap of the volume control with the volume up. Voltage measurements will give you good idea where the problem is. Signal input to the two control grids will also tell you which section. It could be something as simple as the wires going to the speaker are not wired correctly. They are color coded on the schematic. I only suggest that as you indicated in a previous post that they were disconnected.
Good luck and we are watching. The audio section is pretty straight forward.
Jerry
A friend in need is a pest! Bill Slee ca 1970.
Messages In This Thread
RE: Philco 66 - Coil troubles? - by jerryhawthorne - 05-26-2012, 04:15 PM
Users browsing this thread: 1 Guest(s)
|
Recent Posts
|
Philco 42-345 Restoration/Repair
|
Correction
My original picture shows #40 cap, blue cap and #42 resistor connected.osanders0311 — 02:23 PM |
Philco 42-345 Restoration/Repair
|
Well guys I am stuck, frustrated and about ready to give up. For starters all I'm getting from the speaker is a humming ...osanders0311 — 02:17 PM |
[split] New member...
|
Thanks. I'll try that.HowardWoodard — 01:13 PM |
[split] New member...
|
You may have to start further back with your signal injection at the IF signal grid, then tune the second IF transformer...RodB — 10:28 AM |
[split] New member...
|
Well, with the replacement tuning assembly, I have finally put the unit back together and aligned the dial. The first s...HowardWoodard — 01:01 AM |
Philco Model 16 wiring question
|
Well, finding a short is easy.
Like I said, disconnect the transformer's secondary windings and see if it persists.
If...morzh — 09:48 PM |
Restoring Philco 96
|
Nice one!Stan the Man — 09:37 PM |
Restoring Philco 96
|
I have eventually replaced the speaker and shot the video, which only shows the upper part of the dial as the hum is ver...morzh — 09:24 PM |
Rogers Majestic R-646
|
Kinda weird to see both open
Nothing weird if you remember that this radio is about 100 years old :)Vlad95 — 07:49 PM |
Philco 42-345 Restoration/Repair
|
I believe I'm making progress, resistors have been rechecked and corrected, removed that ugly blue capacitor and more wi...osanders0311 — 07:38 PM |
Who's Online
|
There are currently 1099 online users. [Complete List] » 3 Member(s) | 1096 Guest(s)
|
|
|

|