Go Back   Home > Forums > >
Home Forums Rules Articles diyAudio Store Blogs Gallery Wiki Register Donations FAQ Calendar Search Today's Posts Mark Forums Read

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

Resistor values at supply to anodes
Resistor values at supply to anodes
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
Thread Tools Search this Thread
Old 23rd April 2010, 12:31 PM   #1
cr0wl3y is offline cr0wl3y  United Kingdom
diyAudio Member
Join Date: Sep 2009
Default Resistor values at supply to anodes

Hi there,

I am looking for help in changing resistance values in various circuits to get the right voltage at anodes. Advice on the specifics of the design I am working on and/or suggested sources where I can read a bit and understand the basics (which I am clearly lacking) would both be very much appreciated.

I'm "designing" (in reality patching different circuits together) a tube driven mixer. This will comprise phono stages which will feed into the line-level pre-amp which I have posted below, with the addition of a summing circuit in the box that is labelled "MIX". For the summing circuit, I am planning to use the "Feedback simple tube mixer" design in the following page (it's the third schematic):

The Tube CAD Journal: Vacuum tube mixers

You may note that the schematic asks for 200 volts DC supply, whereas the line-level pre needs 250. In addition, the phono stage needs a 300 volt supply. To my understanding, I therefore need to work with a 300 volt supply and:

A. Add a resistor to the power supply input for the line level pre so that voltage drops to 250 V
B. Change the value of the 10K resistor in the mixer circuit, so that instead of dropping 200V -> 100V as shown in the schematic it allows for a 300V -> 200V drop.

How do I calculate the correct values for the resistors I need for A and B?

Thanks a lot,
Attached Images
File Type: gif Remus Line Level.GIF (9.5 KB, 80 views)

Last edited by cr0wl3y; 23rd April 2010 at 12:57 PM.
  Reply With Quote
Old 23rd April 2010, 01:26 PM   #2
Arnulf is offline Arnulf  Europe
diyAudio Member
Join Date: Feb 2009
How to design valve guitar amplifiers

More specifically:

The Valve Wizard


The Valve Wizard
mod verb, transitive /mod/ to state that one is utterly clueless about the operation of device to be "modded" and into "fixing" things that are not broken; "My new amplifier sounds great so I want to mod it."
  Reply With Quote
Old 23rd April 2010, 04:12 PM   #3
bob91343 is offline bob91343  United States
diyAudio Member
Join Date: Mar 2010
Read the section on resistance coupled amplifiers in the back of any RCA tube manual. It's pretty good and even if your specific parameters aren't covered, you can learn enough to do it yourself.
  Reply With Quote


Resistor values at supply to anodesHide 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

Forum Jump

Similar Threads
Thread Thread Starter Forum Replies Last Post
no resistor values........ pointy Tubes / Valves 19 18th December 2009 11:23 PM
Resistor values Valvomaniac Tubes / Valves 5 27th April 2007 04:50 AM
confusion in the resistor/capacitor values and B+ supply for the aikido jarthel Tubes / Valves 1 23rd May 2006 12:58 PM
Resistor values Stocker Chip Amps 3 4th May 2004 03:10 PM
Resistor values? randytsuch Chip Amps 2 11th July 2003 01:08 AM

New To Site? Need Help?

All times are GMT. The time now is 04:26 AM.

Search Engine Optimisation provided by DragonByte SEO (Pro) - vBulletin Mods & Addons Copyright © 2018 DragonByte Technologies Ltd.
Resources saved on this page: MySQL 15.00%
vBulletin Optimisation provided by vB Optimise (Pro) - vBulletin Mods & Addons Copyright © 2018 DragonByte Technologies Ltd.
Copyright ©1999-2018 diyAudio