b+ Delay Arrangement for Power Amp - Page 2 - 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 29th June 2012, 11:12 PM   #11
diyAudio Member
 
Chris Hornbeck's Avatar
 
Join Date: May 2011
Location: Little Rock
Quote:
Originally Posted by commstech View Post
20 seconds later, the AC input to the primary of the HV transformer will be turned on by means of a delay relay and thus giving the HV.
Will there be any potential problems with this kind of arrangement? Eg. any noise or pops when the maximum HV dc hits the tubes?
The delay relay needs to be a snap action, and not an Amperite bi-metal switch type. The latter has too much arcing in its final second at practical load currents, but could run a separate higher rated snap relay.

You may want to consider including a hysteresis to enforce the same startup routine in case of a short power interruption, if not already included.

All good fortune,
Chris
  Reply With Quote
Old 30th June 2012, 12:12 AM   #12
diyAudio Member
 
PlasticIsGood's Avatar
 
Join Date: Mar 2012
Location: Bradford
Quote:
Originally Posted by garbage View Post
i did not manage to solve the problem. the pop occurs at the speaker with the mono that is already turned on. i think it is because the b+ in rush on the 2nd mono caused some spike in the electrical outlet. both monos are connected to the same electrical circuit.

the circuit to my audio room is a dedicated ring that comes from my main circuit breaker.

i guess the only way to really solve this is to build a soft start circuit like the one at ESP, or implement some muting at the output transformer secondary (but i was told that output transformers should ideally not be unloaded for too long).
Does it still pop if the input to the amp is shorted, assuming there is a series cap before the first grid? You would need a relatively big disturbance on the mains supply to make a pop, but only a small one on ground or signal input. Whatever, it could be worth finding out where it's coming from, and how it's getting in. Muting will be logically tricky, surely? How will one amp know when the other has finished switching on? i.e where will the un-mute signal come from?

Maybe series resistors before the first PS caps would make a difference by slowing down the inrush. Worth an experiment if you have low value, high power resistors handy. If they work they will help preserve the caps too.

Perhaps you could switch both amps on with a single timing ciruit?
  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
Simple B+ delay circuit for tube power amp? rongon Tubes / Valves 31 29th August 2011 09:40 AM
Delay Amp power up using a relay. HAUDIO Solid State 3 21st June 2011 02:36 AM
Delay time through power amp? sumaudioguy Solid State 2 6th March 2010 01:12 PM
Janszen Model 1 (New ESL & Woofer Arrangement) bolserst Planars & Exotics 22 12th November 2009 09:42 PM
Question on capacitor arrangement for aleph 2 amp BrianGT Pass Labs 11 12th March 2002 09:51 PM


New To Site? Need Help?

All times are GMT. The time now is 09:03 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