Driver Tube Power Supply Question ? - 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 15th February 2013, 09:13 PM   #1
diyAudio Member
 
Join Date: Jun 2010
Default Driver Tube Power Supply Question ?

.

Last edited by HP8903B; 3rd March 2014 at 10:04 PM.
  Reply With Quote
Old 15th February 2013, 09:30 PM   #2
euro21 is offline euro21  Hungary
diyAudio Member
 
Join Date: Sep 2004
Location: Budapest
850V difference is too much, you must use 4-5 piece 5-10W resistors (connected is series).
I don't recommend this solution, separate power supply is safer.
  Reply With Quote
Old 15th February 2013, 09:56 PM   #3
diyAudio Member
 
Join Date: Jun 2010
Could you tell me the advantage of a separate PS ?
  Reply With Quote
Old 15th February 2013, 11:31 PM   #4
diyAudio Member
 
the_manta's Avatar
 
Join Date: Nov 2006
Location: Munich, Bavaria
It is not really elegant, but hey, your choice. Burning 850V with some resistors doesn't add too much additional heat to such a large transmitting-tube-amp.
But when there is no current draw, the voltage will rise to the full 1000VDC. So each capacitor, tube socket, etc. must be able to withstand the 1000V...heck...even the driver tube. Just imagine when there is a heater fault and the tube ceases its emission. Anode voltage will rise to 1000V whereas cathode voltage will be at ground level.
Better solution is a resistor a some well designed shunt regulator or even an OA3/STV150 tube.
__________________
Терпенье и труд все перетрут
  Reply With Quote
Old 15th February 2013, 11:57 PM   #5
FoMoCo is offline FoMoCo  United States
diyAudio Member
 
Join Date: Dec 2012
Quote:
Originally Posted by the_manta View Post
Better solution is a resistor a some well designed shunt regulator or even an OA3/STV150 tube.
If there's no aversion to semiconductors a 150V Zener will do. Just make sure it'll handle the power.
__________________
Account Deletion Requested: 1/26/2014
  Reply With Quote
Old 16th February 2013, 12:19 AM   #6
diyAudio Member
 
Join Date: Jun 2010
Thank you guys.

Looks like I will be build a separate PS.
  Reply With Quote
Old 16th February 2013, 02:08 AM   #7
MelB is offline MelB  Canada
diyAudio Member
 
Join Date: Feb 2005
Location: BC Canada
If you have a center tap check my schematic here.
GM-70 All done. Is the thread name in this form. You can get 500v from a center tap if you have A bridge rectifier.
  Reply With Quote
Old 16th February 2013, 03:25 AM   #8
diyAudio Member
 
Join Date: Nov 2011
Instead of a high wattage resistor wasting lots of energy as heat, why not use a capacitor from the AC (transformer secondary side) with bridge rectifier and Zener? Work out the total current required and, from there, calculate the reactance at 60 Hz you need and then the capacitor value.
Of course, you will have to be mindful of the capacitor voltage rating and series two or more if necessary. This technique is often used in mains powered LED lights.

Last edited by Bibliophile; 16th February 2013 at 03:28 AM.
  Reply With Quote
Old 16th February 2013, 03:29 AM   #9
diyAudio Member
 
Join Date: Jun 2010
The transformer secondary is 1170V-0-1170V
  Reply With Quote
Old 16th February 2013, 10:35 AM   #10
FoMoCo is offline FoMoCo  United States
diyAudio Member
 
Join Date: Dec 2012
With that much voltage... You might spend as much on power resistors to drop the voltage down to 150V as you would for another small transformer and the associated parts.

A separate supply would be my choice for anything more than a ma or two.

If you've got a filament winding, you could always use a cheap 120 to 6 transformer in reverse...
__________________
Account Deletion Requested: 1/26/2014
  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
VTL driver tube question speakerfritz Tubes / Valves 2 4th September 2012 08:39 PM
Basic tube power supply question dfro Instruments and Amps 22 2nd September 2012 01:32 PM
Power tube maximum current draw from a power supply razorrick1293 Tubes / Valves 4 4th November 2011 10:48 PM
DC supply on driver tube hums.. Ciscokid Tubes / Valves 15 25th September 2008 05:30 AM
Question about tube amp power supply caps gjo Tubes / Valves 12 26th March 2006 11:47 PM


New To Site? Need Help?

All times are GMT. The time now is 05:46 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