reduce voltage

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

Thread Closed

Thread Rating:

0 Vote(s) - 0 Average
1
2
3
4
5

Linear Mode

reduce voltage

rghines1
Member

Posts: 190
Threads: 8
Joined: Oct 2005
City: Lexington, SC

#10

03-18-2010, 08:13 AM

Agree with Ron saying that those caps should not have blown to begin with. Take some voltage measurements of the power supply again.

Concerning using a resistor to drop voltage. Assuming the average B+ current is approximately 80 milliamps and with a 1000 ohm resistor would drop 80 volts. Wrote earlier 100 ohms but that would only drop 8 volts which is not much. A 1000 ohm resistor would need to be 10 watts.

The resistor solution is not perfect since during warmup the voltage can still surge quite high. Rectifiers tend to warmup first before the other tubes are warm enough to start drawing current.

Find

« Next Oldest | Next Newest »

Thread Closed

Messages In This Thread

reduce voltage - by denver - 03-17-2010, 02:12 PM

Re: reduce voltage - by rghines1 - 03-17-2010, 05:41 PM

Re: reduce voltage - by denver - 03-17-2010, 05:50 PM

Re: reduce voltage - by denver - 03-17-2010, 05:54 PM

Re: reduce voltage - by rghines1 - 03-17-2010, 08:09 PM

Re: reduce voltage - by denver - 03-17-2010, 08:22 PM

Re: reduce voltage - by Ron Ramirez - 03-17-2010, 08:37 PM

Re: reduce voltage - by denver - 03-17-2010, 09:39 PM

Re: reduce voltage - by Carl Travis - 03-17-2010, 09:44 PM

Re: reduce voltage - by rghines1 - 03-18-2010, 08:13 AM

Re: reduce voltage - by denver - 03-18-2010, 01:58 PM

Re: reduce voltage - by rghines1 - 03-18-2010, 06:37 PM

Re: reduce voltage - by denver - 03-18-2010, 07:37 PM

Re: reduce voltage - by denver - 03-21-2010, 07:04 PM

Re: reduce voltage - by denver - 04-06-2010, 04:22 PM

Re: reduce voltage - by Ron Ramirez - 04-06-2010, 05:05 PM

Re: reduce voltage - by rghines1 - 04-07-2010, 09:28 AM

Re: reduce voltage - by codefox1 - 04-07-2010, 11:27 AM

View a Printable Version

Users browsing this thread: 3 Guest(s)

Recent Posts
An attempt to remove the Field Coil from a G speaker
Gary I in fact did, on a 38-14, I think, where I had a speaker with the dead coil. Well...it kinda worked. Kinda, be...morzh — 10:38 PM
An attempt to remove the Field Coil from a G speaker
Mike, what ever happened to that plan you had to try using a rare earth magnet to magnetize the pole? This looks like a...GarySP — 10:25 PM
RCA T62 is playing.....
Beautiful set.morzh — 09:07 PM
An attempt to remove the Field Coil from a G speaker
Well....here it is. The green stuff. Unfortunately, probably penetrates deep. I opened the top layer and saw that: ...morzh — 08:58 PM
Philco 91 Restore Code ??
:clap: :clap: :clap: :clap: Really nice workmanship!!! Top of the chassis looks great. Sorry about the long winded e...MrFixr55 — 08:09 PM
Philco 40-120C Restoration
Thank you for your reply. I will check voltages on the other tubes, look at resistor 23 and cap 25, etc. If all else fai...bluecap — 07:58 PM
RCA T62 is playing.....
Nice looking set great save. DavidDavid — 07:48 PM
Philco 89 indicator light.
Hello Jim, I have done several 89s. The trick is to move the drum in or out on it's shaft. You will need to loosen a set...dconant — 07:36 PM
An attempt to remove the Field Coil from a G speaker
MrFixr Yes, it is my plan to go with 45rpm spider if I go that far. No, the pole was not left-handed as I unscrewed ...morzh — 07:14 PM
Philco 40-120C Restoration
Change the tube. Check the tube's bias network. Are any other tubes experience the drop or just this?` Is resistor 23 OK...morzh — 07:09 PM

Who's Online
There are currently no members online.

Login
Username:
Password:	Lost Password?
	Remember me