Welcome Guest! Be sure you know and follow the Phorum Rules before posting. Thank you and Enjoy! (January 12, 2025) x

Thread Closed

38 116 RF tube
#1

I gave a 38 116 to my cousin. I have replaced all caps and out of tolerance resistors.  It played well over a year.

Recently it died so I drove out to see him over the weekend. 

Cheking tubes, the RF rube was dead. I also had no voltage on the plates of the first audio and oscillator (6N7 and 6A8). All components there were correct and not shorted or open where appropriate.   While we wait for a new tube, would a dead RF tube cause the radio to go silent?  I think so but would like an expert opinion to help with troubleshooting if that's not it.

Thanks 
Steve
#2

You might check the resistor numbered 117 on the schematic. This is a chassis mounted wirewound resistor that drops plate voltage to the oscillator and AF tubes. If it opens you will lose plate voltage to the affected tubes.

Also filter cap 70A could be shorted, causing resistor 117 to open.
#3

Thanks. I was thinking that.  I'll check that resistor next trip out there. I need to bring an iron and some tools with me then.

The filter caps are good. All the voltages were close and all they are all new.




Users browsing this thread: 1 Guest(s)
[-]
Recent Posts
Philco P45-6365 Universal Transformer Instruction Manual
Can anyone guide me to where this may be found?GRG — 03:00 PM
54C Complete Teardown/Rebuild
I don't think that I have encountered a 12Z3 before, curious how it uses one of those but includes a #43, which is a 25 ...Arran — 02:17 PM
HiFi (Chifi) tube amp build - but my own design.
It's the other forum. I'm also in DIY, but mostly read there. Honestly, I kinda jumped into this without much thought to...TV MAN — 10:43 AM
Philco 71 Code 125
Hello,  I am in need of a schematic for this radio. Mine has the three separate circular tube shields and a shadow me...dconant — 08:06 AM
Stromberg Carlson 1500 Squeal
And life just keeps getting more complicated.dconant — 07:57 AM
54C Complete Teardown/Rebuild
Hello Roy, here is this one sincerely Richardradiorich — 12:45 AM
54C Complete Teardown/Rebuild
Richard, Had grabbed it already but thank you just the same.  I find myself wanting to find some way to block out the...glyphmon — 12:03 AM
54C Complete Teardown/Rebuild
Hello roy, here is a link to the schematic . Sincerely Richardradiorich — 11:54 PM
54C Complete Teardown/Rebuild
Richard, The Silvertone 2014 also is a transformerless set, so I am incorporating a 1:1 600 ohm audio isolation transfo...glyphmon — 11:37 PM
Preliminary work on wife's Silvertone 2014
Did an alignment today which was interesting.  IF alignment went great, almost all was already spot-on.  Adjusting on th...glyphmon — 11:35 PM

[-]
Who's Online
There are currently 2384 online users. [Complete List]
» 1 Member(s) | 2383 Guest(s)
Avatar

>