Posts: 15,761
Threads: 551
Joined: Oct 2011
City: Jackson, 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: 91
Threads: 18
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: 15,761
Threads: 551
Joined: Oct 2011
City: Jackson, 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: 91
Threads: 18
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: 91
Threads: 18
Joined: Jun 2024
City: tampa
State, Province, Country: florida
No ac function. Pegs the meter to the left, no adjustment.
Posts: 15,761
Threads: 551
Joined: Oct 2011
City: Jackson, 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: 91
Threads: 18
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: 15,761
Threads: 551
Joined: Oct 2011
City: Jackson, 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: 91
Threads: 18
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: 15,761
Threads: 551
Joined: Oct 2011
City: Jackson, 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.
(This post was last modified: 11-10-2024, 03:29 PM by morzh.)
Posts: 91
Threads: 18
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: 15,761
Threads: 551
Joined: Oct 2011
City: Jackson, 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: 91
Threads: 18
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: 15,761
Threads: 551
Joined: Oct 2011
City: Jackson, 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.
(This post was last modified: 11-10-2024, 07:20 PM by morzh.)
Posts: 91
Threads: 18
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 38-2 Low Volume
|
| Hi MrFixr55, The aux sound was good and yes it can be made too loud. The tone has no real effect on volume just tone, ge...dconant — 06:04 PM |
|
RF Choke and Condenser -42-PT-7
|
| Hi Folks,
If you are talking about Part #7, this is the cap that capacitively grounds the physical chassis to B- and...MrFixr55 — 06:04 PM |
|
Photo-finish repair
|
| Thanks for the reply Bob. I think I will try the touchup process. Do you have any suggestions on what I should use to ...georgetownjohn — 05:52 PM |
|
Philco 38-2 Low Volume
|
| Hi DConant,
I don't think that the extra 0.7 MOhm would make much difference. If the pot was supposed to be a 500KOhm...MrFixr55 — 05:21 PM |
|
Photo-finish repair
|
| Welcome to the Phorum! :wave:
Once upon a time there was a supplier for some photofinish decals but no longer that I...klondike98 — 05:21 PM |
|
Philco 38-2 Low Volume
|
| Hi MrFixr55, Thank you for the drawing. I can handle that. I disconnected the muting switch from the center pin of the p...dconant — 04:50 PM |
|
Philco 38-2 Low Volume
|
| Sorry, I did not see your post as I was writing mine. I would think that with a consumer electronics level Aux input of...MrFixr55 — 04:24 PM |
|
Philco 38-2 Low Volume
|
| HI DConat,
It wouldn't hurt to put a 0.01 uF cap between the deck and volume control. However, there is a 0.01uF cap b...MrFixr55 — 02:57 PM |
|
Philco 38-2 Low Volume
|
| I connected my tape deck to the pot as stated with a .01 cap between. Volume is still low. Maybe I am expecting too much...dconant — 02:57 PM |
|
Philco 38-2 Low Volume
|
| Well,
your IF is your RF Input signal minus the Local Oscillator.
So, your IF = |RF - LO|
(that is the absolute...morzh — 02:25 PM |
|
Who's Online
|
There are currently 1245 online users. [Complete List]
» 3 Member(s) | 1242 Guest(s)
|
|
|
|
 
|
![[-]](https://philcoradio.com/phorum/images/bootbb/collapse.png "[-]")
