Separate Filament and B+ Switches - Page 3 - diyAudio
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 24th July 2012, 08:35 PM   #21
diyAudio Member
 
Vinylsavor's Avatar
 
Join Date: Feb 2002
Location: Lindau
Hi!

Wire the two switches such that the filament switch not only switches the filament transformers, but also applies the mains voltage to the HV switch. This avoids that the HV can be accidentally switched on without filament voltage.

Best regards

Thomas
__________________
http://vinylsavor.blogspot.com/
  Reply With Quote
Old 24th July 2012, 08:37 PM   #22
diyAudio Member
 
Wavebourn's Avatar
 
Join Date: Sep 2006
Location: Pleasant Hill, CA
Send a message via Skype™ to Wavebourn
Quote:
Originally Posted by Osvaldo de Banfield View Post
I personally stronger dislike mixin' sand and glass. SS for SS and VTR for tube amp.
I personally strongly like to mix whatever needs to get better results. And can't understand why somebody would want to set meaningless boundaries.
__________________
The Devil is not so terrible as his math model is!
  Reply With Quote
Old 24th July 2012, 08:42 PM   #23
diyAudio Member
 
Wavebourn's Avatar
 
Join Date: Sep 2006
Location: Pleasant Hill, CA
Send a message via Skype™ to Wavebourn
Quote:
Originally Posted by Vinylsavor View Post

Wire the two switches such that the filament switch not only switches the filament transformers, but also applies the mains voltage to the HV switch. This avoids that the HV can be accidentally switched on without filament voltage.
Looks like it is the best solution of the initial problem. Such approach was used in radar stations. Also, antenna switches (actually, doors between waveguides) had additional switches to prevent powering on high voltage source until it switches properly. It was the requirements for magnetrons, to have hot emitting cathode, and properly tuned output, before applying anode voltage. However, I don't understand why it would be needed for audio amps, but since it is a hobby everyone is free to go for own personal goals.
__________________
The Devil is not so terrible as his math model is!
  Reply With Quote
Old 24th July 2012, 08:54 PM   #24
Magz is offline Magz  United States
diyAudio Member
 
Join Date: Oct 2009
Location: New Jersey, USA
Quote:
Originally Posted by Vinylsavor View Post
Hi!

Wire the two switches such that the filament switch not only switches the filament transformers, but also applies the mains voltage to the HV switch. This avoids that the HV can be accidentally switched on without filament voltage.

Best regards

Thomas
Good Idea! Thanks, Thomas!
  Reply With Quote
Old 24th July 2012, 08:56 PM   #25
Magz is offline Magz  United States
diyAudio Member
 
Join Date: Oct 2009
Location: New Jersey, USA
Quote:
Originally Posted by Wavebourn View Post
However, I don't understand why it would be needed for audio amps, but since it is a hobby everyone is free to go for own personal goals.
In this case the answer is...because I want to!

Maybe I have a switch fetish.
  Reply With Quote
Old 24th July 2012, 09:00 PM   #26
diyAudio Member
 
Wavebourn's Avatar
 
Join Date: Sep 2006
Location: Pleasant Hill, CA
Send a message via Skype™ to Wavebourn
Quote:
Originally Posted by Magz View Post
In this case the answer is...because I want to!

Maybe I have a switch fetish.
Please don't use "the brand of a switch with 4 letters that start with Ni."

__________________
The Devil is not so terrible as his math model is!
  Reply With Quote
Old 24th July 2012, 09:15 PM   #27
diyAudio Member
 
FullRangeMan's Avatar
 
Join Date: Aug 2009
Location: Brazil
Two switches are the only right way to power on a tube amp, it is less expensive and simpler too, I fell afraid when I see just a sole switch in a amp.
Temporized relay, clocks etc are more expensive and prone to fail with age, a 2șclass solution, some tubes had long heating time as 6C33(600 seconds) for the cathode to reach the proper temperature, a 600 seconds timer is too long.
Ralph Karsten use two switches in the Atma-Sphere amps and its run alot of tubes.
__________________
>Never go to a psychiatrist, adopt a cat or dog from the streets. On the streets pets live only two years average.

Last edited by FullRangeMan; 24th July 2012 at 09:20 PM.
  Reply With Quote
Old 24th July 2012, 09:19 PM   #28
diyAudio Member
 
Davec113's Avatar
 
Join Date: Jul 2007
Quote:
Originally Posted by Vinylsavor View Post
Hi!

Wire the two switches such that the filament switch not only switches the filament transformers, but also applies the mains voltage to the HV switch. This avoids that the HV can be accidentally switched on without filament voltage.

Best regards

Thomas
Great idea! I will rewire my preamp this way.
  Reply With Quote
Old 24th July 2012, 10:54 PM   #29
Magz is offline Magz  United States
diyAudio Member
 
Join Date: Oct 2009
Location: New Jersey, USA
Quote:
Originally Posted by mvd View Post
Or building the rectifier with damper-diodes wich give you a nice warm-up time from 20 to 30 seconds.

For a preamp the duo-diode 6BY5 from RCA would be a good choice.

Best regards
Michael
I have a couple 6BY5s, but I'm leaning toward an all DH preamp. Having two switches gives more flexibility.
  Reply With Quote
Old 24th July 2012, 10:59 PM   #30
DF96 is offline DF96  England
diyAudio Member
 
Join Date: May 2007
Quote:
Originally Posted by FullRangeMan
Two switches are the only right way to power on a tube amp
Nonsense. In most cases one switch with no sequencing at all is the correct way to power an amp. If sequencing is needed (rare with normal audio valves) then it should be automatic. If you are "afraid" then use proper interlocking so the switching is failsafe. Two switches is either a DIY fad (it's a free world) or a marketing ploy for ignorant people. Why not add a third switch for the input signal?
  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
Top quality main switches for audio-hifi comp (Rotary and Pushbutton Power Switches) tiefbassuebertr Parts 12 10th March 2010 05:14 PM
Parallel vs. series filament supply - or another filament idea engels Tubes / Valves 11 13th May 2007 02:06 PM
How to separate E from I in transformer? mad_z Parts 15 1st November 2006 09:20 PM
A simple way to create dual(or more!) rotary switches out of single rotary switches stappvargen Pass Labs 14 17th April 2004 12:33 AM


New To Site? Need Help?

All times are GMT. The time now is 08:58 AM.


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