Posts: 18,427
Threads: 622
Joined: Oct 2011
City: Jackson
State, Province, Country: NJ
Two things.
1. Make sure your switch is clean and provide good contact across all ranges. It is S2 Range switch.
2. I don't think this is it (I think only the lower dual triode is involved for DC, as for everything else), but just in case, have the tubes been checked?
People who do not drink, do not smoke, do not eat red meat will one day feel really stupid lying there and dying from nothing.
Posts: 106
Threads: 23
Joined: Jun 2024
City: tampa
State, Province, Country: florida
Tubes and resistors are fine. R22 measures 9k so iam not sure if that could be the issue.
Posts: 18,427
Threads: 622
Joined: Oct 2011
City: Jackson
State, Province, Country: NJ
Switch. Check the switch. Make sure it makes good contacts. Clean if necessary, Deoxit D or any contact cleaner (be careful and don't spray it all around).
People who do not drink, do not smoke, do not eat red meat will one day feel really stupid lying there and dying from nothing.
Posts: 106
Threads: 23
Joined: Jun 2024
City: tampa
State, Province, Country: florida
I cleaned and checked the sw2 switch, its fine. Has to be something in the .5v to 15v circuit. Iam going to check the ac operation.
Posts: 106
Threads: 23
Joined: Jun 2024
City: tampa
State, Province, Country: florida
No ac function. Pegs the meter to the left, no adjustment.
Posts: 18,427
Threads: 622
Joined: Oct 2011
City: Jackson
State, Province, Country: NJ
If I had it in front of me, I would triy to trace the signal on one of the non-working functions.
Try to trace and highlite at least one non-working path.
People who do not drink, do not smoke, do not eat red meat will one day feel really stupid lying there and dying from nothing.
Posts: 106
Threads: 23
Joined: Jun 2024
City: tampa
State, Province, Country: florida
At this point, there is no input, just internal voltages
Which are incorrect and not sure what they should be.
Posts: 18,427
Threads: 622
Joined: Oct 2011
City: Jackson
State, Province, Country: NJ
Those will probably depend on teh switch combination.
Could you list some that you see, their values and what they should be (if you know correct values)?
People who do not drink, do not smoke, do not eat red meat will one day feel really stupid lying there and dying from nothing.
Posts: 106
Threads: 23
Joined: Jun 2024
City: tampa
State, Province, Country: florida
Check out this crazy zero pot operation. Touching it drives it crazy. Its rubber tipped. Also the 6al5 has no negative voltage on it.
https://www.dropbox.com/scl/fi/gnvltn9la...fvikk&dl=0
Posts: 18,427
Threads: 622
Joined: Oct 2011
City: Jackson
State, Province, Country: NJ
If this is R22, check the voltage on the wiper (86V).
If this is R33, see if the lower pin indeed connected to GND, the wiper is indeed wipes, and if the pot is OK.
People who do not drink, do not smoke, do not eat red meat will one day feel really stupid lying there and dying from nothing.
Posts: 106
Threads: 23
Joined: Jun 2024
City: tampa
State, Province, Country: florida
I measured the wiper of r22 , 95vdc.
(This post was last modified: 11-10-2024, 05:14 PM by daveone23.)
Posts: 18,427
Threads: 622
Joined: Oct 2011
City: Jackson
State, Province, Country: NJ
The resistor you are touching at the video, is it R22 or R33?
People who do not drink, do not smoke, do not eat red meat will one day feel really stupid lying there and dying from nothing.
Posts: 106
Threads: 23
Joined: Jun 2024
City: tampa
State, Province, Country: florida
R22, but it doesnt do that all the time. Strange. What do you think of the 95 voltage. I guess its close.
Posts: 18,427
Threads: 622
Joined: Oct 2011
City: Jackson
State, Province, Country: NJ
Yes, it is close. It is a solid state diode rectifier, so the voltage won't depend much on the load, as would with tube rectifier.
However the behavior is strange.
Also, see if this pot,s case (and so the shaft) should be grounded through the fron panel, and somehow it is not.
People who do not drink, do not smoke, do not eat red meat will one day feel really stupid lying there and dying from nothing.
Posts: 106
Threads: 23
Joined: Jun 2024
City: tampa
State, Province, Country: florida
Case and shaft go to case. Center wiper of r22 has 3kohms to case.
Users browsing this thread: 1 Guest(s)
|
|
Recent Posts
|
|
Philco 71 Code 125
|
| Looks like that might be the B- buss, so that would be correct.RodB — 01:32 PM |
|
Philco 71 Code 125
|
| I noticed on the code 121 schematic the center tap for the 6 volt winding and hv winding are tied together. Is this corr...dconant — 12:16 PM |
|
Philco 45-6365 Universal IFT Instruction Manual
|
| The Philco Parts Catalog for 1942 shows it as usable for 175 kHz, 260 kHz, and 465 kHz. The instructions will show how t...DaleHCook — 11:19 AM |
|
Stromberg Carlson 1500 Squeal
|
| Hello Rob,
I agree with you—I have one here at my house that I need to check out. It’s way over-engineered just to make...radiorich — 11:05 AM |
|
My Atwater Kent 84
|
| Well getting around to restoring my AK84. Mike was a big part in me being able to snatch this one a few years ago. I won...462ron — 10:57 AM |
|
Plug Voltages Needed For A 1943 CRV-20130 Power Supply
|
| The engine is a B&S 23 inch cast Iron holds 2 quarts of oil. The Generator is a 4 pole 1800 rpm mine was made in 195...David — 10:51 AM |
|
Philco 45-6365 Universal IFT Instruction Manual
|
| Dale: Modified topic as suggested. It is not for a specific project. I found it in a box of stuff I recently purchased...GRG — 10:34 AM |
|
Plug Voltages Needed For A 1943 CRV-20130 Power Supply
|
|
That looks a lot like an aircraft connector of some kind ...
That is a MIL-5015 style connector, used in a wide v...DaleHCook — 10:19 AM |
|
Philco P45-6365 Universal Transformer Instruction Manual
|
| I would suggest changing the topic from "P45-6365 Universal Transformer" to "45-6365 Universal IFT."...DaleHCook — 10:08 AM |
|
Stromberg Carlson 1500 Squeal
|
| And life just keeps getting more complicated. By dconant.
Dittos'Jimradio — 08:01 AM |
|
Who's Online
|
There are currently 1924 online users. [Complete List]
» 1 Member(s) | 1923 Guest(s)
|
|
|
|
 
|
![[-]](https://philcoradio.com/phorum/images/bootbb/collapse.png "[-]")
