Go Back   Home > Forums > Amplifiers > Pass Labs

Pass Labs This forum is dedicated to Pass Labs discussion.

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 13th August 2013, 08:47 PM   #3721
lhquam is offline lhquam  United States
diyAudio Member
 
Join Date: Mar 2010
Location: Olalla, Oregon: Land of the 100 Valleys
What is the preferred front-end (voltage gain stage) for a single-ended F4?

I am looking at the BA3 FE, Pumpkin, Blowtorch, and various opamps. The difficulty is getting enough voltage swing and a voltage gain of 6x or better with low distortion, particularly higher order harmonics.
  Reply With Quote
Old 13th August 2013, 09:13 PM   #3722
Zen Mod is offline Zen Mod  Serbia
diyAudio Member
 
Zen Mod's Avatar
 
Join Date: Jan 2003
Location: ancient Batsch , behind Iron Curtain
replied in other thread
__________________
my Papa is smarter than your Nelson !
tnx to clean thread ; Cook Book ; PSM LS Cook Book ; Baby Diyaudio FORUM ; Mighty ZM's Bloggg;I'm dumb ; Papatreasure
  Reply With Quote
Old 13th August 2013, 09:43 PM   #3723
diyAudio Member
 
buzzforb's Avatar
 
Join Date: Oct 2010
Location: Burlington, NC
I would say BA3(actually BA3B) based on our conversations. I would tend to lean towards Pumpkin personally, but the BA3B may come close to the sonic signature I would expect from Pumpkin, at least closer than other PP FE's. Pumpkin is a beast and Generg has had nothing but positive things to say. In other words. You cant lose.
__________________
...Shape the sound , Man!
  Reply With Quote
Old 13th August 2013, 10:04 PM   #3724
6L6 is offline 6L6  United States
diyAudio Member
 
6L6's Avatar
 
Join Date: Oct 2010
Location: Denver, Colorado
Don't forget to look at the ImPasse - it's very clever in it's design.

Buzz had a balanced/se F4 driver from a particular opamp (I don't remember which) that he has said good things about...
__________________
Illustrated Build Guides - Pass F4 - Pass B1 - Pass F5 - Pearl 2 - O2 HPA - Hagerman Bugle 2 - Pass Aleph J - Me at BA '13
  Reply With Quote
Old 13th August 2013, 10:07 PM   #3725
Itsmee is offline Itsmee  England
diyAudio Member
 
Itsmee's Avatar
 
Join Date: Feb 2009
buzz, you beat me to it

Quote:
Originally Posted by buzzforb View Post
I would tend to lean towards Pumpkin personally......... .........Pumpkin is a beast and Generg has had nothing but positive things to say.
Me, ditto.

I think Generg prefers the Pumpkin and 'crippled' F4 even more.

Quote:
Originally Posted by buzzforb View Post
.......the BA3B may come close to the sonic signature I would expect from Pumpkin, at least closer than other PP FE's.
I would have thought the BA2 would be closer to a 'single ended' input and output Pumpkin.
  Reply With Quote
Old 13th August 2013, 10:12 PM   #3726
lhquam is offline lhquam  United States
diyAudio Member
 
Join Date: Mar 2010
Location: Olalla, Oregon: Land of the 100 Valleys
If driving a single-ended F4, why would one use a balanced BA3 FE rather than unbalanced?
  Reply With Quote
Old 13th August 2013, 10:16 PM   #3727
diyAudio Member
 
buzzforb's Avatar
 
Join Date: Oct 2010
Location: Burlington, NC
@Ilquam,
You wouldn't.

@Itsmee,
The Ba3B has a different sound. Use CFB and it gets even more interesting or at least potentially interesting.
__________________
...Shape the sound , Man!
  Reply With Quote
Old 13th August 2013, 11:00 PM   #3728
Itsmee is offline Itsmee  England
diyAudio Member
 
Itsmee's Avatar
 
Join Date: Feb 2009
Just had another look at the BA3B, I didn't see any current feedback.

If you remove the left output of the Pumpkin and ground the right input via a capacitor, then flip the circuit top to bottom, Ok it is cascoded and has a current sink in the output stage (or is that current source since the flip lol) but other than that, it does look similar to a BA2.
  Reply With Quote
Old 14th August 2013, 07:43 AM   #3729
generg is offline generg  Germany
diyAudio Member
 
generg's Avatar
 
Join Date: Jul 2009
Location: Near Frankfurt
Quote:
Originally Posted by lhquam View Post
If driving a single-ended F4, why would one use a balanced BA3 FE rather than unbalanced?
You would do this when you have for instance a CD -Player with balanced Output.
With the balanced BA-3 you have a kind of UGS6 and it is open to all kinds of in and outputs.

PumpKING and F4 was a very very God combination......

And it offers the same variations of in and outputs, but I did not compare BBA-3 and Pumpkin under the same conditions......
__________________
and the First Wtt is......a really First Class PSS Idea
  Reply With Quote
Old 14th August 2013, 10:06 AM   #3730
diyAudio Member
 
buzzforb's Avatar
 
Join Date: Oct 2010
Location: Burlington, NC
Quote:
Originally Posted by Itsmee View Post
Just had another look at the BA3B, I didn't see any current feedback.

If you remove the left output of the Pumpkin and ground the right input via a capacitor, then flip the circuit top to bottom, Ok it is cascoded and has a current sink in the output stage (or is that current source since the flip lol) but other than that, it does look similar to a BA2.
Your are correct, but with slight adjustment it it possible. For now they just exchange current info through source connection of input pair.
__________________
...Shape the sound , Man!
  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
Rockford Fosgate Power 20001 bd amplifier power rating?? pachoorion Car Audio 8 8th May 2011 10:49 PM
Power transformers versus amplifier output power..what is your option? destroyer X Solid State 38 9th May 2009 05:23 PM
McIntosh Power Amplifier Power Guard johnnyrt Solid State 2 23rd August 2007 10:22 PM
Output power for a power amplifier Progg70 Solid State 33 10th September 2006 08:44 AM
Amplifier 3000 Wats Rms Power + Smps Higcht Power Bestiality MARAVILLASAUDIO Class D 1 5th November 2004 04:06 PM


New To Site? Need Help?

All times are GMT. The time now is 08:36 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