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

double check the math
double check the math
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 26th March 2006, 10:54 PM   #1
tenderland is offline tenderland  United States
diyAudio Member
tenderland's Avatar
Join Date: Jul 2004
Location: us
Default double check the math

Hello Im building the attached amp in a mono mode and the B+ will be
300 v instead of 350. to keep the preamp voltages and currents the same I calculated the the 27K feed resistor to be now 3333 ohms
Does this seem kosher ?

Thanks Jeff
Attached Images
File Type: gif se2a3.2001.gif (43.8 KB, 132 views)
"If every one is making wheels , why make wheels ? " Steve Jobs
  Reply With Quote
Old 26th March 2006, 11:08 PM   #2
arnoldc is offline arnoldc  Philippines
diyAudio Member
Join Date: Apr 2003
Location: Makati
Send a message via Yahoo to arnoldc
The voltage difference then is 350-293 = 57V, with 27000 dropping resistor, the current is 2mA.

Now you want to drop 7V (300-293) at 2mA, the resistor is 3500 ohms.

  Reply With Quote
Old 27th March 2006, 04:24 PM   #3
richwalters is offline richwalters
diyAudio Member
richwalters's Avatar
Join Date: Sep 2003
Location: Schwartzwald
Use switchmode caps for cathode decoupling stages...they make a worthwhile improvement in sound quality. Choose 105C low ESR types. Soundwise, I find them just as good a tants, esp for 1st stage.

  Reply With Quote
Old 27th March 2006, 04:48 PM   #4
Giaime is offline Giaime  Italy
diyAudio Member
Giaime's Avatar
Join Date: Oct 2004
Send a message via MSN to Giaime
Originally posted by richwalters
Soundwise, I find them just as good a tants, esp for 1st stage.

Do you really like tants?
  Reply With Quote


double check the mathHide 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
Can I get a double check on my cabinet? saabracer23 Subwoofers 23 9th June 2009 07:34 PM
Check my math? Jalex420 Chip Amps 18 3rd June 2006 08:58 AM
DIY Sub with DAYTON RSS315HF-4 in progress; Can someone check my math? bcycle Subwoofers 18 7th February 2006 10:30 PM
Crossover math check jmikes Multi-Way 6 13th December 2004 10:30 PM

New To Site? Need Help?

All times are GMT. The time now is 04:05 AM.

Search Engine Optimisation provided by DragonByte SEO (Pro) - vBulletin Mods & Addons Copyright © 2018 DragonByte Technologies Ltd.
Resources saved on this page: MySQL 15.79%
vBulletin Optimisation provided by vB Optimise (Pro) - vBulletin Mods & Addons Copyright © 2018 DragonByte Technologies Ltd.
Copyright ©1999-2018 diyAudio