Thread Rating:
  • 0 Vote(s) - 0 Average
  • 1
  • 2
  • 3
  • 4
  • 5

RCA WV-98c
#16

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.
#17

Tubes and resistors are fine. R22 measures 9k so iam not sure if that could be the issue.
#18

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.
#19

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.
#20

No ac function. Pegs the meter to the left, no adjustment.
#21

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.
#22

At this point, there is no input, just internal voltages
Which are incorrect and not sure what they should be.
#23

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.
#24

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
#25

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.
#26

I measured the wiper of r22 , 95vdc.
#27

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.
#28

R22, but it doesnt do that all the time. Strange. What do you think of the 95 voltage. I guess its close.
#29

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.
#30

Case and shaft go to case. Center wiper of r22 has 3kohms to case.




Users browsing this thread: 5 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 1437 online users. [Complete List]
» 4 Member(s) | 1433 Guest(s)
AvatarAvatarAvatarAvatar

>