|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
||Thread Tools||Search this Thread|
|8th January 2012, 04:14 PM||#1|
Join Date: Jan 2008
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.
|Thread Tools||Search this Thread|
|Thread||Thread Starter||Forum||Replies||Last Post|
|converting a magnavox pp 6v6 in triode mode||tubo||Tubes / Valves||10||18th May 2011 02:07 PM|
|Do EL34s in pentode mode PP AB1 sound better with lower screen voltage?||ray_moth||Tubes / Valves||11||1st December 2010 02:59 PM|
|screen supply for Simple PP Pentode mode?||chrisb||Tubelab||2||8th November 2010 05:24 AM|
|budget xformer for 829B pentode mode PP (class AB) ?||vladn||Tubes / Valves||42||12th October 2008 06:03 PM|
|Using a spdt switch to select between triode mode and pentode mode on a guitar amp.||G||Instruments and Amps||19||15th March 2006 09:15 AM|
|New To Site?||Need Help?|