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

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, 01:18 PM
RE: Sencore SG165 rf problem - by morzh - 05-14-2015, 01:40 PM
RE: Sencore SG165 rf problem - by KCMike - 05-14-2015, 02:53 PM



Users browsing this thread: 1 Guest(s)
[-]
Recent Posts
Cannot Adjust an IF Transformer’s cores
It works! I received the PCBs this morning in the mail, and put everything together. I reused the base from the original...jrblasde — 04:32 PM
PT-6 antenna connections
I seem to have lost my way on this PT-6. I see the antenna aerial transformer schematic - I’m reading pins 1 through ...bridkarl — 12:30 PM
40-150 General questions
Good thing you're a good electrician ... the pictures show a lot of rewiring in your future! Take care and BE HEALTHY!...GarySP — 11:52 AM
40-150 General questions
I think RobB has it right. It is a part number and looks like its stamped on the chassis and that wasn't something you ...klondike98 — 11:41 AM
40-150 General questions
It's most likely a part number. Most of Philco part numbers are in that format. I looked at the parts list for this mode...RodB — 08:10 AM
40-150 General questions
Hi Kevin, No, I don't but I like your Quote about being a good electrician. The way I look at it is "The fact ...MrFixr55 — 08:06 AM
Philco 38-7 Speaker
7K should be fine. While not a perfect match (This transformer is meant for 6V6 tubes), Antique Electronic Supply (AES)...MrFixr55 — 08:03 AM
40-150 General questions
I discovered a stamp on the underside of the breadboard on my Philco 40-150. It is"56-1417' in black ink with numbe...Kevin_D — 07:14 AM
Philco 38-7 Speaker
FYI the Impedance of the HR20 (the one I have) secondary of the audio transformer is 5 ohms. The 38-7XX speaker is suppo...tludka — 04:22 PM
Philco 38-7 Speaker
Yeah, don't use the transformer currently on the H-20 (Dopf, I thought "H20, is that new technology, a speaker usin...MrFixr55 — 03:51 PM

[-]
Who's Online
There are currently 2229 online users. [Complete List]
» 1 Member(s) | 2228 Guest(s)
Avatar

>