1. The PHILCO Phorum
  2. Philco Radio Discussions
  3. Philco Electronic Restoration
Thread Rating:
  • 0 Vote(s) - 0 Average
  • 1
  • 2
  • 3
  • 4
  • 5

Linear Mode
Safe to powerup without Speaker?
Steve Davis
Phorum Expert
*****
Posts: 1,400
Threads: 70
Joined: Oct 2007
City: Linn Creek, MO
#2

12-25-2014, 05:38 PM
It's not a good idea to power a radio up without a speaker connected. The B+ will go high and possibly damage the filter capacitors. Also, the screen grid in the output tube will draw a large current and get red hot.

Steve 
M R Radios   C M Tubes
Find
« Next Oldest | Next Newest »


Messages In This Thread
Safe to powerup without Speaker? - by keith49vj3 - 12-25-2014, 04:00 PM
RE: Safe to powerup without Speaker? - by Steve Davis - 12-25-2014, 05:38 PM
RE: Safe to powerup without Speaker? - by David - 12-25-2014, 08:37 PM
RE: Safe to powerup without Speaker? - by OZ4 - 12-25-2014, 08:56 PM
RE: Safe to powerup without Speaker? - by morzh - 12-25-2014, 09:02 PM
RE: Safe to powerup without Speaker? - by morzh - 12-25-2014, 11:54 PM
RE: Safe to powerup without Speaker? - by joejoe - 12-26-2014, 11:36 PM
RE: Safe to powerup without Speaker? - by morzh - 12-27-2014, 04:14 PM
RE: Safe to powerup without Speaker? - by OZ4 - 12-27-2014, 04:22 PM
RE: Safe to powerup without Speaker? - by Warren - 12-27-2014, 05:11 PM
RE: Safe to powerup without Speaker? - by morzh - 12-28-2014, 04:14 PM



Users browsing this thread: 1 Guest(s)
[-]
Recent Posts
PT-6 antenna connections
Notice in the schematic the notch at the bottom of the antenna coil is between pins 3 & 4. Yes, pin 6 of the 7C6 is...RodB — 07:34 PM
bridkarl
I have two PT-6 chassis. On both there is a blue wire that runs from the above chassis transformer to pin 6 of 7C6. So t...bridkarl — 07:23 PM
Cannot Adjust an IF Transformer’s cores
Joseph, now you are an engineer!!RodB — 06:37 PM
PT-6 antenna connections
Hi, reading your explanation I can see the confusion. If you take it one connection at a time it should result in a desi...RodB — 06:34 PM
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

[-]
Who's Online
There are currently 3052 online users. [Complete List]
» 2 Member(s) | 3050 Guest(s)
AvatarAvatar

>
  1. The PHILCO Phorum
  2. Philco Radio Discussions
  3. Philco Electronic Restoration