Welcome Guest! Be sure you know and follow the Phorum Rules before posting. Thank you and Enjoy! (January 12) x

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

42-1008 code 121
#16

unfortunately not
#17

I'm not entirely sure of the state of the tubes, I have a knight 600b tube tester but it doesn't list any of these tubes on the scroll
#18

Good time to find one. Doesn't have to be anything fancy but it allow us to inject a signal and hear what stages are working. You can go thru and measure the pin voltages on all the tubes (5Y4 is ok) and see if there are any anomalies.

When my pals were reading comic books
I was down in the basement in my dad's
workshop. Perusing his Sam's Photofoacts
Vol 1-50 admiring the old set and trying to
figure out what all those squiggly meant.
Circa 1966
Now I think I've got!

Terry
#19

I'll see about acquiring one, and in the meantime i'll test and record pin voltages for each tube. As you can tell I'm new to radio's and I really appreciate the help you given me.

Icon_thumbup
#20

Ive got a heathkit sg-8 on the way
#21

What kind of voltage should i be seeing out of the output transformer?
#22

THe simple way to check the voltages at the transformer is to measure the plate pin of the output tube (on the 41's it's pin 2) So measure the voltage from pin 2 to the chassis. On both tubes should see abt 250vdc. Then measure the voltage on the screen grids (pin 3) should see about the same. One of the screen grids is going to be a bit lower in voltage as it has a 3,000 ohm resistor in series with the hv source.

When my pals were reading comic books
I was down in the basement in my dad's
workshop. Perusing his Sam's Photofoacts
Vol 1-50 admiring the old set and trying to
figure out what all those squiggly meant.
Circa 1966
Now I think I've got!

Terry
#23

nothing on those and the center tap is dead also... Looks like I'm back in the same boat. Do you know of a new tx i can get for this?
#24

To be clear I'm speaking of the output transformer.
If the power transformer was bad (now) you wouldn't have 600vac from pin 3 to pin 5 on the 5Y4.

When my pals were reading comic books
I was down in the basement in my dad's
workshop. Perusing his Sam's Photofoacts
Vol 1-50 admiring the old set and trying to
figure out what all those squiggly meant.
Circa 1966
Now I think I've got!

Terry
#25

Power transformer:
3 and 5 (yellow)=637 ac volts
7 and 8(blue)=370 dc volts
on the 5Y4

Between black and black coming off the PT 6.5 volts ac

yellow-green center tap= o volts to chassis

Output transformer:
0 volts VDC from pin 2 on 41 tube to chassis
#26

And pin 3 of the 41 tubes??

When my pals were reading comic books
I was down in the basement in my dad's
workshop. Perusing his Sam's Photofoacts
Vol 1-50 admiring the old set and trying to
figure out what all those squiggly meant.
Circa 1966
Now I think I've got!

Terry
#27

I got high tech and set up a thermal imaging camera on the chassis as I slowly wound up the variac, and found the #77 resistor on the far left side was what was getting hot and smoking.
#28

I found 2- 470k resistors that where out of spec by a little over 20% that go to the bias resistor, I'm hoping that is my issue. What wattage resistor should those be replaced with? I don't see a rating on the schematic. 2 watt?
#29

To follow up on this post, There was a short in the field transformer wires, and a resistor that was not connected. Set is now receiving. Thank you Terry!

-rperry




Users browsing this thread:
[-]
Recent Posts
1949 Motorola 5A9M
Nice job on the battery, Bob. Can the box be opened to replace the 9 volters?RodB — 11:32 AM
Philco 46-1209 strange behavior
Thank you for the detailed response MrFixr. To clarify, the hum starts when the tubes are fully warmed up, and goes a...sq65 — 09:15 AM
Philco 46-1209 strange behavior
MrFixr The chassis, if there is no ground pin in the AC plug, due to the Y-caps from L/N to the chassis, is at 60VAC re...morzh — 08:47 AM
schematics
thanks I'll try the polar caps seperatelymseno — 07:38 AM
Philco 46-1209 strange behavior
Hi SQ55, A strange issue indeed!  Just so I have you straight, on a dim bulb you get normal operation after the set warm...MrFixr55 — 12:44 AM
schematics
I think mseno is talking about cap# 27 which is a multisection but in a paper tube. In cases like that I've usually be ...klondike98 — 11:25 PM
schematics
Ohrenet  :roll: For their price I would chase a fly in a field.  :twisted:Vlad95 — 11:21 PM
1949 Motorola 5A9M
A bit more work on the Motorola. I got the repro battery together right up until I realized the snap clips on the top o...klondike98 — 10:45 PM
schematics
Often restuffed. If a twistlock, Hayseed Hamfest makes modern replacements. morzh — 09:18 PM
schematics
Looking for a multi-sectional 8+16 mfd cap. Can't find any suppliers that carry it.mseno — 08:45 PM

[-]
Who's Online
There are currently 1172 online users. [Complete List]
» 1 Member(s) | 1171 Guest(s)
Avatar

>