Go Back   Home > Forums > Amplifiers > Tubes / Valves

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

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 Search this Thread
Old 14th September 2005, 06:29 PM   #1
Bryan is offline Bryan  United States
diyAudio Member
 
Join Date: Jun 2003
Location: Reading MA
Default Timer Relay

Hey Guys,

So I've been searching, and I can't seem to find what I need (for a reasonable price).

I need a relay which will switch on after about 30-60 seconds.

Basically, I need to provide fillament warm-up before the hv kicks in. So, I would like to use a relay that after a set time-point will switch the mains on to the HV trannies. The relay should be powered by 120VAC, and be able to switch either 120VAC or ground the center tap of the HV tranny.

I've seen several octal type delay relays, but these are expensive (~$50). Is there any type which is in the $10-20 range?

Thanks,

Bryan
__________________
Dont take life too seriously, you will never get out alive!
  Reply With Quote
Old 14th September 2005, 10:42 PM   #2
diyAudio Member
 
Join Date: Dec 2003
Location: Toledo, OH
How about an Amperite time delay relay tube? They're retro and tubelike, though you may only be able to use one to switch another higher-capacity relay. You can find a datasheet here.
  Reply With Quote
Old 14th September 2005, 10:46 PM   #3
diyAudio Member
 
astouffer's Avatar
 
Join Date: Jun 2004
Location: Pittsburgh, crumbling wasteland
Every commercial relay is going to be fairly expensive. You can do the delay with a 555 timer.

http://555-timer.clarkson-uk.com/operation/delay.html

The 555 can sink 200ma so a transistor may not be needed. Make sure the relay coil has a diode across it to supress any spikes. You could easily power this from the 6v filament line. Anything from 6-12v should work.
  Reply With Quote
Old 14th September 2005, 11:41 PM   #4
diyAudio Member
 
Join Date: Jan 2002
Location: Tyrone Ga. U.S.A.
Have you considered using damper diodes such as the 6d22s
for the rectifier? With there slow warmup time this might be all the delay you need.
  Reply With Quote
Old 15th September 2005, 03:18 AM   #5
diyAudio Moderator Emeritus
 
ray_moth's Avatar
 
Join Date: Jan 2004
Location: Jakarta
Quote:
Have you considered using damper diodes such as the 6d22s
Yes, TV damper diodes give you both a delay (30 seconds) AND a soft start. Using one of these, in series with an SS diode bridge, I am able to use a B+ fuse of only 500mA (fast blow) even though I am charging a total of 700uF worth of reservoir and filtering capos through it. The fuse has never blown! I use my 6D22S in the negative line, so there isn't a dangerous voltage at the top cap (the cathode). You lose only about 15v.

You can also use these diodes succesfully as one half of a hybrid bridge, or as a full-wave rectifier if your HT secondary winding is centre-tapped. However you lose a lot more volts that way.
  Reply With Quote
Old 15th September 2005, 06:40 AM   #6
sst4270 is offline sst4270  United States
diyAudio Member
 
Join Date: Aug 2005
Location: Glen Burnie, MD
Default Just built my first amp

Just built my first amp. Rick Spencer's Mini SE Amp from 4-04 AudioXpress. The circuit calls for just such a relay.
I bought it from a local appliance parts store just like the author suggested. Paid $10.50.
It is the ICM102. Data sheet attached. Works great.
  Reply With Quote
Old 15th September 2005, 11:45 AM   #7
EC8010 is offline EC8010  United Kingdom
diyAudio Moderator Emeritus
 
EC8010's Avatar
 
Join Date: Jan 2003
Location: Near London. UK
I've tried measuring the warm-up time of 6CL3 and found it was exactly the same as EZ81. 11 seconds. Not what I expected, but there you are.
__________________
The loudspeaker: The only commercial Hi-Fi item where a disproportionate part of the budget isn't spent on the box. And the one where it would make a difference...
  Reply With Quote

Reply


Hide this!Advertise here!
Thread Tools Search this Thread
Search this Thread:

Advanced Search

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
Trackbacks are Off
Pingbacks are Off
Refbacks are Off


Similar Threads
Thread Thread Starter Forum Replies Last Post
Safety timer/relay in JLTi/VBIGC not working as hoped gaplessophile Chip Amps 5 23rd August 2009 04:10 AM
First Timer needs help mgalvez Tubes / Valves 24 17th October 2007 10:34 PM
Need help with PIC timer. Tolik Parts 9 9th May 2007 10:02 PM
Need Advice with Timer Relay Shut Off Bryan Tubes / Valves 7 25th October 2005 07:43 PM
Quick Relay/Timer Help Needed woodrufj Parts 3 24th June 2004 06:05 PM


New To Site? Need Help?

All times are GMT. The time now is 07:12 PM.


vBulletin Optimisation provided by vB Optimise (Pro) - vBulletin Mods & Addons Copyright © 2014 DragonByte Technologies Ltd.
Copyright 1999-2014 diyAudio

Content Relevant URLs by vBSEO 3.3.2