Posts: 228
Threads: 64
Joined: Dec 2013
City: Northbrook, IL
I have 6AD6G indicator, which more often than not stays off, occasionally comes on, pretty dim in appearance, but when "on", operates normally and sensitive to the strong station.There is no loose connections.Shows 230 DC at the pin #5 (B+) instead of 180, but this 50v difference is across the board on all tubes- possibly from using 47 and 23uF caps instead of 40 and 20(?)
All other voltage readings are within norm.And I do not have the tube tester.
Time for the tube replacement? Thanks.
Posts: 16,217
Threads: 562
Joined: Oct 2011
City: Jackson
State, Province, Country: NJ
http://www.ebay.com/itm/Pair-of-NOS-NIB-...3f32cd0d91
If no one bids, get them.
Meantime, is the a socket that has a resistor inside or something? Have you checked?
Posts: 228
Threads: 64
Joined: Dec 2013
City: Northbrook, IL
No, no resistors, just straight wire connections.
Posts: 16,217
Threads: 562
Joined: Oct 2011
City: Jackson
State, Province, Country: NJ
If you are sure you have your filament current (can you see the filament glow when the tube is dark?) and your anodes (you do not have to have grid to have it glow) voltages and it is intermittent then it could be a bad tube with some intermittent separation inside.
Of course you have to exclude the possibility of bad socket connections etc.
Posts: 462
Threads: 40
Joined: Jun 2010
City: Lehighton
State, Province, Country: PA
Yeah, I think before I would do anything else I would run a pipe cleaner thru the socket holes and make sure they are clean, perhaps with a bit of DeOxit of it.
Larry
Posts: 214
Threads: 16
Joined: May 2010
City: Kokomo, IN
You might try resoldering the pins on the tube.
Posts: 228
Threads: 64
Joined: Dec 2013
City: Northbrook, IL
Done all of the above. I usually change all wiring, remove each pin socket, clean and tighten it. All pins have voltage, albeit 30% higher than normal.
I just found out that original 10watt 1,5K B+ resistor had been replaced with 1.0K resistor, hence the elevated B+ on all tubes, but that should not be detrimental to the glow issue.
Posts: 1,562
Threads: 56
Joined: Nov 2008
City: Sedona, AZ/Placentia/CA
Fields, nice to post a link to the schematic. Every radio with an eye tube I have worked on (not your particular tube) has had a 1meg resistor either in the tube socket (mostly) or external and are a source of problems.
A friend in need is a pest! Bill Slee ca 1970.
Posts: 228
Threads: 64
Joined: Dec 2013
City: Northbrook, IL
@Jerry,
This one does not have any resistors.This particular set up is very interesting and unusual.Unfortunately, I am still having difficulties (or may be just ignorant) with a postings, but the schematic is on the NostalgiaAir and if you don't mind to see it there and let me know what you think, I would appreciate it. It is Airline 04WG803B. Thanks.
Posts: 1,562
Threads: 56
Joined: Nov 2008
City: Sedona, AZ/Placentia/CA
Appears your right fields. Not familiar with that tube. Here is a link to the schematic for others.
Jerry
http://www.nostalgiaair.org/PagesByModel...011032.pdf
A friend in need is a pest! Bill Slee ca 1970.
Posts: 228
Threads: 64
Joined: Dec 2013
City: Northbrook, IL
Got the new tube, everything's fine, response to the tuning is OK. Thanks for the hint. Have a question on B+ voltage. The 1500 ohm 10W resistor at the rectifier had been replaced with a 1000 ohm. Could be on the account of the half dead E-caps.Now, after recapping, my B+ at the plates is 230v instead of 180v. How detrimental is it for the occasional usage of this set? Thanks.
Posts: 2,128
Threads: 18
Joined: Oct 2008
City: Merrick, Long Island, NY
Tame the B+ to specs. No telling what excess voltage might do to your set. Use dropping resistor's) in voltage divider to achieve factory specs.
Users browsing this thread: 1 Guest(s)
|
|
Recent Posts
|
|
6TPZ and 5TPO Radio Help
|
| If you are still on 5TPO, you lost me there. What X7? What Points 1 and 2?morzh — 08:37 PM |
|
6TPZ and 5TPO Radio Help
|
| Quick progress report:
X7 is broken. Only one leg soldered, the other missing and the diode is cracked.
I've replaced...R3Sons — 05:05 PM |
|
6TPZ and 5TPO Radio Help
|
| Oh...and you have electrolytic caps there.
All need to go and be replaced.morzh — 04:36 PM |
|
6TPZ and 5TPO Radio Help
|
| Thanks, will do.R3Sons — 01:25 PM |
|
1930s Stewart-Warner Tombstone Radio need help identifying model number
|
| UPDATE: I was able to pick up a signal generator on the cheap (amazingly enough) on feebay and I did an IF alignment fol...captainclock1988 — 09:53 AM |
|
Philco 91 Schematic
|
| Hi Rod,
The resistor connects to pin 4 and the ungrounded side of block 9. From pin 9 of the RF tube to one side of ...dconant — 09:34 AM |
|
Just got a 49-1613 need to know...everything!
|
| I just found your post. I have this exact same model, and have had it since 1985 when I was 15 years old! I performed a ...MuzzcoVW — 09:11 AM |
|
B&K 1077B no video
|
| Hello Tim,
I would if it's a leaky Capacitor So are all 3 of those B- voltages low then ?
Sincerely Richardradiorich — 01:55 AM |
|
B&K 1077B no video
|
| I found a schematic and think I have the problem traced down to the minus power supply. I have very low voltages that go...TV MAN — 12:41 AM |
|
RCA 15X
|
| I'd try replacing the bulb first and if that doesn't do it, then change the 35Z5 and see if the problem goes away.NostalgiaRadioTime — 12:28 AM |
|
Who's Online
|
There are currently 5239 online users. [Complete List]
» 5 Member(s) | 5234 Guest(s)
|
|
|
|
 
|
![[-]](https://philcoradio.com/phorum/images/bootbb/collapse.png "[-]")
