6v6 PP Pentode mode - 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 8th January 2012, 05:14 PM   #1
wicked1 is online now wicked1  United States
diyAudio Member
 
wicked1's Avatar
 
Join Date: Jan 2008
Location: Midwest
Default 6v6 PP Pentode mode

A few years ago I asked about modding a pair of ampex 612 (620) 6v6 amps.
Ampex 6v6 PP Modifications
(Schematic is in that thread.. Power TX outputs 360v after the rectifier tube)

Basically, in the end I triode wired the input tube and the 6v6's, and removed the feedback.
They were never great, and back then I for some reason didn't wan to stray too far from the original schematic. Now I just want to reuse the iron.

Most of the fashionable 6v6 amps are all triode wired. I'm thinking I'd like to try pentode. So, finally the questions.

Why doesn't anyone do pentode 6v6 (hi-fi) amps? Is triode really that much better?

Then, any advice for pentode? I'll definitely add a negative supply and CCS to the LTP and regulate the screens on the outputs. I guess I'd just like any other advice on implementing pentode 6v6 amp.

(Final note, someone in that old thread suggesting trying 6l6's. I know the circuit I was using wasn't set up for that at all, but it did work, and the power TX's seemed to be able to handle the extra heater current w/out any trouble. Plus, I'll most likely be removing the input tube which frees up a little more heater current. So, I could probably use 6l6's or something.. but I don't know the exact specs on any of the transformers, so maybe it's best to stick to 6v6.. just throwing the possibility out there...)

Thanks for your help! I realize these general opinion type threads aren't the most useful in the long run of the forum.. But I appreciate the advice and it does help.
  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
converting a magnavox pp 6v6 in triode mode tubo Tubes / Valves 10 18th May 2011 03:07 PM
Do EL34s in pentode mode PP AB1 sound better with lower screen voltage? ray_moth Tubes / Valves 11 1st December 2010 03:59 PM
screen supply for Simple PP Pentode mode? chrisb Tubelab 2 8th November 2010 06:24 AM
budget xformer for 829B pentode mode PP (class AB) ? vladn Tubes / Valves 42 12th October 2008 07:03 PM
Using a spdt switch to select between triode mode and pentode mode on a guitar amp. G Tubes / Valves 19 15th March 2006 10:15 AM


New To Site? Need Help?

All times are GMT. The time now is 02:40 AM.


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