Go Back   Home > Forums > >

Tubes / Valves All about our sweet vacuum tubes :) Threads about Musical Instrument Amps of all kinds should be in the Instruments & Amps forum

Safety Practices, General and Ultra-High Voltage
Safety Practices, General and Ultra-High Voltage
Please consider donating to help us continue to serve you.

Ads on/off / Custom Title / More PMs / More album space / Advanced printing & mass image saving
Reply
 
Thread Tools
Old 10th May 2020, 05:30 AM   #441
opcom is offline opcom  United States
diyAudio Member
 
opcom's Avatar
 
Join Date: May 2008
Location: Texas
@ AllIsParadox:

I live too much in the past with those wireless video links and stuff.. - a smartphone with the facetime-like app or something would also be a way, if minutes are not an issue.

Last edited by opcom; 10th May 2020 at 05:34 AM.
  Reply With Quote
Old 10th May 2020, 06:17 AM   #442
6A3sUMMER is offline 6A3sUMMER  United States
diyAudio Member
 
Join Date: Jun 2016
opcom,

The only 110VDC gear I ever saw was my brothers Philco AM 4 tube radio with 3-way power
(90VDC battery + 1.5V or 3V battery; 110VAC; and 110VDC).

Parallel resistors for a bleeder is a pretty good idea.
The problem with bleeder resistors is that you can get carried away.
Suppose you have an amplifier B+ filter that is CRCRCRC.
Which C do you put the parallel bleeder resistors across?
What if one of the 3 Rs in that B+ filter burns out, then one end or the other of that filter chain will not be bled down.
So you use 8 bleeder resistors just to be safe?

I use resistors that have power ratings of 5X the power that will be in them. They run cooler, and are less likely to fail.
  Reply With Quote
Old 3rd September 2020, 12:41 AM   #443
jy999 is offline jy999
diyAudio Member
 
Join Date: Sep 2020
I'm a long-term electronics hobbyist getting started on tube amps. Boy this thread is giving me anxiety - this is terrifying! Good info, though. I'd rather be scared, and careful, than injured or dead.

I just picked up a 15w amp with a dead transformer (apparently). Waiting for my variac and parts to build a bulb limiter and capacitor draining leads, and then I'll pull and test that transformer. Wish me luck!
  Reply With Quote
Old 13th January 2021, 09:35 PM   #444
jwags818 is offline jwags818  United States
diyAudio Member
 
Join Date: Aug 2005
Location: Wilsonville Oregon, Corvallis Oregon native (You can't lick our beavers!).
I can attest 500+V hurts! Being one of the few that don't seem to learn very fast I have hit myself good 3 times with 500V+. Once thru both hands. Luckily didn't do a thing to me but hurt. I did however blow a hole in my arm once and bled all over the place. From a shock..!!
Bleed resistors save lives.... Use them.
__________________
Jwags818 - Wilsonville, Oregon
D50s - 300B/D3A SET - 12in Audio Nirvana Speakers
  Reply to this post

Reply


Safety Practices, General and Ultra-High VoltageHide this!Advertise here!
Thread Tools

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off

Forum Jump

Similar Threads
Thread Thread Starter Forum Replies Last Post
Workbench safety practices? Stormrider Equipment & Tools 3 3rd August 2008 06:08 PM
Safety with high volts: 101 rick57 Tubes / Valves 34 1st April 2005 05:51 PM
Safety Practices, General and Ultra-High Voltage DrDeville Everything Else 49 23rd September 2004 10:31 AM


New To Site? Need Help?

All times are GMT. The time now is 08:26 AM.


Search Engine Optimisation provided by DragonByte SEO (Pro) - vBulletin Mods & Addons Copyright © 2021 DragonByte Technologies Ltd.
Resources saved on this page: MySQL 14.29%
vBulletin Optimisation provided by vB Optimise (Pro) - vBulletin Mods & Addons Copyright © 2021 DragonByte Technologies Ltd.
Copyright ©1999-2021 diyAudio
Wiki