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

foolish notion, 12GN7 model?
foolish notion, 12GN7 model?
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 25th February 2007, 10:33 PM   #1
billy pilgrim is offline billy pilgrim  United States
diyAudio Member
Join Date: Jan 2007
Location: NYC
Default foolish notion, 12GN7 model?

I have this foolish notion of building an input xformer coupled PP amp with a differential mu stage thingy as the voltage amp/ driver stage. I'm thinking of using a 12GN7 / 12HG7 as the plate load ....would any one have an LT spice model that could be shared? Or some other hi gm pentode? I'd be very greatful.

Or maybe someone could talk me out of it?
  Reply With Quote
Old 26th February 2007, 01:27 AM   #2
Bandersnatch is offline Bandersnatch  United States
diyAudio Member
Join Date: Jul 2003
Location: Ann Arbor, MI
I have done similar. It was a cascode of two 12GN7, the lower one triode strapped and the upper running as a pentode. Output Z was ~80R at 9 mA. It was for a linestage plate load, and I ran a single L-C filter for the PS and ran the pentodes on 12.6VAC. The amplifier triode was the 12B4 and it's held the record for unmolested operation and exclusion from parts-donor status for new projects.

If you want to use a single, it should be fairly easy, if you want to run two, you will need to figure out some voltage refrences...
the Tnuctipun will return
  Reply With Quote


foolish notion, 12GN7 model?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

Forum Jump

Similar Threads
Thread Thread Starter Forum Replies Last Post
Kef Model 105's phill1012k Multi-Way 14 28th August 2008 10:15 AM
12B4 PP Full Differential Amp Notion Sheldon Tubes / Valves 8 21st May 2008 01:12 AM
JBL Model L55 laced Multi-Way 0 15th November 2004 06:55 AM

New To Site? Need Help?

All times are GMT. The time now is 02:33 AM.

Search Engine Optimisation provided by DragonByte SEO (Pro) - vBulletin Mods & Addons Copyright © 2018 DragonByte Technologies Ltd.
Resources saved on this page: MySQL 16.67%
vBulletin Optimisation provided by vB Optimise (Pro) - vBulletin Mods & Addons Copyright © 2018 DragonByte Technologies Ltd.
Copyright ©1999-2018 diyAudio