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

My introduction
#3

A fully tube functional radio will pretty much discharge most of the charge because current continues to flow after the set is off. Not so when there is no load. A capacitor is capable of storing a charge for hours, if not days. I use a 10K 2 watt resistor and test leads to discharge anything I'm working on. Leave this attached for at least 10 seconds to drain all the juice out.

And I usually install a "bleeder" resistor of about 100-or 200 K across the main resovoir as a further safety measure when I rebuild something. Two resistors in series, if the voltage is over 400 volts.

You should replace all the electrolytics and paper capacitors in the set before you apply any voltage to it. The cost is very little compared with the likelyhood of burning up an expensive tube or transformer. If you have to replace the wiring as well, I would probably go ahead and replace all the carbon resistors as well (you will find that in most cases they have increased in ohmage,) and this can make a big difference in performance once you are finally done with the set.

Good Luck


Messages In This Thread
My introduction - by Guest - 04-13-2010, 12:06 PM
Re: My introduction - by Uffda - 04-13-2010, 03:30 PM
Re: My introduction - by codefox1 - 04-13-2010, 03:58 PM
Re: My introduction - by Ron Ramirez - 04-27-2010, 07:56 AM



Users browsing this thread: 1 Guest(s)
[-]
Recent Posts
Made mistake & did not label connection
Hi John, I don't have this radio, but I can supply some info: Based on your pic, pins 7,8 and 1 are used together, go...MrFixr55 — 02:02 PM
New Philco Repair Bench
As far as I know, the Repairbench does not work, and has not been working in a while. Chuck (we had that campaign looki...morzh — 01:33 PM
Radio city products 664 schematic request
Need a schematic or manual for the 664. The 663 may be similar.daveone23 — 12:38 PM
New Philco Repair Bench
Thanks Gary.dconant — 12:16 PM
New Philco Repair Bench
I tried accessing the site through our library and got the same response. It's reported to our tech gurus. GaryGarySP — 11:50 AM
New Philco Repair Bench
I am sure this is the archive, and not the Chuck's site.morzh — 09:50 PM
Made mistake & did not label connection
It's not like we are good friends with that wire and can tell it from other ptetty identical looking wires. Why'n't you...morzh — 09:49 PM
Made mistake & did not label connection
I'm not sure why that wire wasn't covered in the video. I'm pretty sure the 6A8 won't work until that pin is grounded. Y...RodB — 09:47 PM
Made mistake & did not label connection
You'll have to forgive me, I am not sure what you mean.  Can you explain what you are really saying.  If anyone does not...georgetownjohn — 08:05 PM
Made mistake & did not label connection
Those are details better left to the ones who know. Maybe you disconnected the wrong end of the wire.RodB — 06:22 PM

[-]
Who's Online
There are currently no members online.

>