need schematic reading help - 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 7th January 2006, 09:56 PM   #1
diyAudio Member
 
Join Date: Jan 2006
Location: Kansas
Default need schematic reading help

Hi, after much reading and a few headaches I am trying to build my first amp. I am using a schematic that I found on boozehound labs. This being my first attempt at reading one, I have had several hurdles. The 2 that have me stumped are how to know watt values on the resistors, and where can I find tube pin connection diagrams. My thinking is that building this (simple) single ended amp will help me in my quest to understand tube audio circuits. Many many thanks in advance to anyone who has any advice. jayman
  Reply With Quote
Old 7th January 2006, 10:09 PM   #2
Sherman is offline Sherman  United States
diyAudio Member
 
Join Date: Feb 2004
Location: Chicago area
Jayman,

Welcome to the world of vacuum tubes! A simple SE design really is a good place to start when trying to learn about tube audio.

Check the notes in the margins of the schematics (if there are any) for the wattage of the resistors. In general you can use 1/2W resistors everywhere in the amp circuit except for the plate resistor and the cathode resistor of the output. You can calculate the required wattage for those resistors by using Ohm's law.

You know the voltage to the resistor and the current draw of the amp section (input our output). So calculate the power through the resistor. To be safe double that amount. If your calculation says for instance there is 1/2W there use at least a 1W resistor.

For pinouts check the data sheets for the tubes. Another great resource is Duncan Amps TDSL (Tube Data Sheet Locator). There is also a free downloadable version of TDSL you can run on your computer that has data about hundreds (thousands?) of tubes including pinouts and links to their data sheets.
__________________
--Sherman
  Reply With Quote
Old 7th January 2006, 11:57 PM   #3
diyAudio Member
 
Join Date: Jan 2006
Location: Kansas
Thanks Sherman, There was a note stating that resistors were vishay 1/2 watt and 3 watt from mouser. I will however do the calculations as a math exercise! I am amazed at how helpful everyone in this hobby seems to be! Thanks again, Jayman
  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
Help reading schematic Renron Multi-Way 14 15th January 2008 08:31 PM
Need help reading cap flatpicker Parts 2 7th January 2008 06:44 PM
Schematic Reading Help orson198305 Instruments and Amps 9 26th May 2006 03:23 AM
About CD reading Sandor Digital Source 3 8th January 2006 01:59 AM
Some reading ... sobazz Multi-Way 0 25th January 2004 10:47 AM


New To Site? Need Help?

All times are GMT. The time now is 12:31 PM.


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