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

Thread Closed

Sencore SG165 rf problem
#3

Thanks Mike, I did have it hooked to scope when checking the sine/ square wave ,not the fm frequency. With the tuning shaft broke after fixing , I was using an B&k 1gig frequency counter to test the fm frequency. The am is reading fine. I will have to reinstall the main rf board and transistors to get it back to look at on scope. I would think the fm should read on the frequency counter. The counter reads all the fm frequencies on my leader lsg 215a signal generator.
Before removing the main RF board I did check the volts from ground to base of the tr315. It read -12volts. according to manual oscillator tr314 runs only when there is 12v+ at base of tr315 turning it on and supplying emitter current to tr314. I don't know why it had 12v- at base. Thats why I thought I had a bad tr315 transistor. The molex plug to RF board from the power supply board have both -12v and 12v+. I will try to get the schematic downloaded and put up here.

http://s1336.photobucket.com/user/220koh...c.jpg.html
http://s1336.photobucket.com/user/220koh...b.jpg.html
Here is the rf section of the manual.


Messages In This Thread
Sencore SG165 rf problem - by KCMike - 05-14-2015, 02:18 PM
RE: Sencore SG165 rf problem - by morzh - 05-14-2015, 02:40 PM
RE: Sencore SG165 rf problem - by KCMike - 05-14-2015, 03:53 PM



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 no members online.

>