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

DC coupled single ended cathode follower 6SJ7/6V6 amp project
DC coupled single ended cathode follower 6SJ7/6V6 amp project
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 27th July 2019, 06:07 PM   #91
Dinolobe is offline Dinolobe  Canada
diyAudio Member
Join Date: Jun 2018
I measured my output transformers and adjusted the values accordingly into the simulation. The result is a half square half sine wave with unequal spikes everywhere. Do I get those results because the circuit doesn’t fit the OPTs or because I have to enter appropriate values in order for the simulation to work properly ? Here are the measurements :

Primary : 225 dcr / 5k ohm / 2.26Hy
Secondary : 0.01 dcr / 8 ohm

Inductance measured with cheap LCR meter, I am not shure if I can trust the results, especially when considering that the simulation has a 1khz input signal and the tester probably only does DC...
  Reply With Quote
Old 27th July 2019, 09:01 PM   #92
piano3 is offline piano3  United Kingdom
diyAudio Member
Join Date: Aug 2010
Location: London,UK
You can't measure iron cored inductors with a multi-meter; you need to apply known AC voltages at known frequencies, measure the currents and calculate inductance using the formula for inductive impedance.
  Reply With Quote
Old 28th July 2019, 12:54 PM   #93
rongon is offline rongon  United States
diyAudio Member
rongon's Avatar
Join Date: Jul 2009
Location: Across the river from Rip's big old tree...
DC coupled single ended cathode follower 6SJ7/6V6 amp project
You should be able to get a decent simulation using a pre-existing model of an OPT that's similar to the one you'll be using.

A few years ago, someone contributed an Excel spreadsheet with a good number of useful OPT models, which I've been using for simulations. (Whoever you are -- Thank you!) It won't get you an *exact* sim of your circuit, but it will allow you to get close. Once you have a simulation that looks good to you, build it and do the necessary tweaking.

I've attached the Transformer Models Rev4.xls file in a zip. I hope it proves useful.

PS - There's a discussion of OPT models for LTspice on the Intact Audio site:
:: View topic - Drop down transformer models for LTSpice
Attached Files
File Type: zip Transformer Models Rev4.zip (64.7 KB, 6 views)

Last edited by rongon; 28th July 2019 at 01:02 PM.
  Reply With Quote
Old 28th July 2019, 05:35 PM   #94
jhstewart9 is offline jhstewart9  Canada
diyAudio Member
jhstewart9's Avatar
Join Date: Apr 2013
Location: near Toronto
Default Summary of Triode Output Stage

This article should help. All summed up well in the last two paragraphs.
  Reply With Quote


DC coupled single ended cathode follower 6SJ7/6V6 amp projectHide 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
Transformer coupled cathode follower power? Sodacose Tubes / Valves 28 29th December 2016 04:55 PM
DC Coupled Cathode Follower Questions steeledriver Instruments and Amps 22 1st April 2016 03:57 PM
A case of direct coupled cathode follower Mosquito Tubes / Valves 62 9th June 2014 02:06 PM
DC coupled cathode follower driving me nuts funk1980 Tubes / Valves 12 9th November 2011 05:48 PM
A Direct-Coupled Amplifier with Cathode Follower 6V6 livingdeliberately Tubes / Valves 6 31st March 2011 06:41 PM

New To Site? Need Help?

All times are GMT. The time now is 05:36 AM.

Search Engine Optimisation provided by DragonByte SEO (Pro) - vBulletin Mods & Addons Copyright © 2019 DragonByte Technologies Ltd.
Resources saved on this page: MySQL 14.29%
vBulletin Optimisation provided by vB Optimise (Pro) - vBulletin Mods & Addons Copyright © 2019 DragonByte Technologies Ltd.
Copyright ©1999-2019 diyAudio