Posts: 16,467
Threads: 573
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: 96
Threads: 20
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: 16,467
Threads: 573
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: 96
Threads: 20
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: 96
Threads: 20
Joined: Jun 2024
City: tampa
State, Province, Country: florida
No ac function. Pegs the meter to the left, no adjustment.
Posts: 16,467
Threads: 573
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: 96
Threads: 20
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: 16,467
Threads: 573
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: 96
Threads: 20
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: 16,467
Threads: 573
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: 96
Threads: 20
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: 16,467
Threads: 573
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: 96
Threads: 20
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: 16,467
Threads: 573
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: 96
Threads: 20
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: 2 Guest(s)
|
|
Recent Posts
|
|
The list of my radio & TV collection!
|
| Peter;
I found an old thread on the ARF, I was wrong about when Rogers took over DeForest Crosley, it looks like it wa...Arran — 06:15 AM |
|
The list of my radio & TV collection!
|
| Thank you Arran, this is very interesting information. With your permission, I will definitely use it when I make a vide...RadioSvit — 04:14 AM |
|
The list of my radio & TV collection!
|
| Peter;
For a start your DeForest Crosley 6D632 was a 1936-37 model, and I believe it had six tubes, and 3 wave bands,...Arran — 03:07 AM |
|
AES type of Battery Eliminator has hum in B+
|
| This is interesting, they actually designed the B+ side with some form of voltage regulation, I think? Most of the B+ su...Arran — 02:21 AM |
|
AES type of Battery Eliminator has hum in B+
|
| They are trying to use a regulator. Essentially it is an LDO schematic. LDOs are supposed to greatly reduce ripple, so t...morzh — 12:11 AM |
|
AES type of Battery Eliminator has hum in B+
|
| So, I just built a 90 volt 40ma battery eliminator for a farm radio and had to use 1000 mfd for the input filter cap to ...RodB — 10:31 PM |
|
AES type of Battery Eliminator has hum in B+
|
| Caps of 1,000 uF 250V are about $7 in Mouser.
C1 could be increased.
A NTC inrush limiter could be employed to limit t...morzh — 10:24 PM |
|
AES type of Battery Eliminator has hum in B+
|
| Bruce B — 09:41 PM |
|
AES type of Battery Eliminator has hum in B+
|
| Bruce
Could you post the schematic if this power supply?morzh — 09:31 PM |
|
AES type of Battery Eliminator has hum in B+
|
| Hello All,
I have built a battery eliminator using the most popular AES K101a. Using plans and all the AES parts order...Bruce B — 09:27 PM |
|
Who's Online
|
There are currently 1919 online users. [Complete List]
» 1 Member(s) | 1918 Guest(s)
|
|
|
|
 
|
![[-]](https://philcoradio.com/phorum/images/bootbb/collapse.png "[-]")
