Supertotem - 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 4th March 2004, 05:09 PM   #1
diyAudio Member
 
Join Date: Jul 2001
Location: Italy
Default Supertotem

Hello at all
A new super SRPP preamp circuit called "Supertotem" is now published on my site.

thanks for your attention
Filippo
www.audiofanatic.it
  Reply With Quote
Old 4th March 2004, 07:12 PM   #2
diyAudio Senior Member
 
fdegrove's Avatar
 
Join Date: Aug 2002
Location: Belgium
Hi,


Thank you.

This is the type of circuit I designed for a French manufacturer using ECC88.

It was used in their first DACs.
We called it RAPP, Regulated Anode Push-Pull, for the fun of it.

Cheers,
__________________
Frank
  Reply With Quote
Old 5th March 2004, 03:42 AM   #3
diyAudio Member
 
Join Date: Nov 2003
Location: flyover country
I get an error 404 when I click on the 'supertotem'
  Reply With Quote
Old 5th March 2004, 04:06 AM   #4
DougL is offline DougL  United States
diyAudio Member
 
Join Date: Feb 2004
Location: Wheaton IL.
Blog Entries: 30
Just a quick question. What does this design do that a standard totem pole doesn't?

Just asking about the virtues.

Cheers;

Doug
  Reply With Quote
Old 5th March 2004, 10:31 AM   #5
diyAudio Member
 
Join Date: Nov 2003
Location: Genova, Italy
Hi

is it the same (or a variant) of
what is usually called a "Gomez" stage?

http://digilander.libero.it/paeng/srpp_vs_gomez.htm


Federico
  Reply With Quote
Old 6th March 2004, 01:00 AM   #6
diyAudio Senior Member
 
fdegrove's Avatar
 
Join Date: Aug 2002
Location: Belgium
Hi

Quote:
is it the same (or a variant) of what is usually called a "Gomez" stage?
Not too many people know about the Gomez circuit which is similar but not quite the same.

Quote:
Just asking about the virtues.
The advantages are there same as for any other twin triode run in // as are the disadvantages.

During the days when anything called a cathode follower was a big no-no and as the SRPP was popular this technique was used to lower Zo and increase transconductance and linearity using just two tubes.
Another advantage is that you can bring Vf very close or even equal to Vc without affecting the bottom triodes.

Cheers,
__________________
Frank
  Reply With Quote
Old 6th March 2004, 01:26 AM   #7
DougL is offline DougL  United States
diyAudio Member
 
Join Date: Feb 2004
Location: Wheaton IL.
Blog Entries: 30
Quote:
The advantages are there same as for any other twin triode run in // as are the disadvantages
Frank,

Thank you. That was exactly what I was looking for.

Cheers;

Doug
  Reply With Quote
Old 6th March 2004, 02:18 AM   #8
diyAudio Member
 
smoking-amp's Avatar
 
Join Date: Dec 2001
Location: Hickory, NC
Default tweaks

Seems to me that changing V2 (on the Supertotem schematic) to a set of pentodes would make it work better. V2a would act as a true current source load, giving V1a higher gain and better linearity. V2b would have more gain to degenerate locally as a cathode follower. The screen voltage supply would have to float, being referenced to V2a's cathode. Maybe R8 could be eliminated then, or bypassed, to lower Zo also.

Of course, with this many tubes to play with, one could just make a LTP to control the output totem pole pair with a gain-setting resistive feedback loop back to the LTP grid #2.
__________________
I want a Huvr-Board!!
  Reply With Quote
Old 6th March 2004, 11:31 PM   #9
Previously: Kuei Yang Wang
 
Join Date: Nov 2002
Default Re: Supertotem

Konnichiwa,

Quote:
Originally posted by filippo22
A new super SRPP preamp circuit called "Supertotem" is now published on my site.
Actually, in most ways this is functionally equivalent to a SRPP coupled to a white follower. It was covered ages ago in l'Audiophile and used among others by Bel Canto in their 845 SET Amp's.

My own take for a "Supertotem" is attached. The 1.2mA Current Source is meant to be J-Fet & Resistor....

Sayonara
Attached Images
File Type: gif super-mu-stage.gif (7.3 KB, 452 views)
  Reply With Quote
Old 7th March 2004, 04:02 AM   #10
diyAudio Senior Member
 
fdegrove's Avatar
 
Join Date: Aug 2002
Location: Belgium
Hi

Quote:
Actually, in most ways this is functionally equivalent to a SRPP coupled to a white follower.
What is "this" ?
The diagram on Philippos' site's got nothing to do with what is shown by you at all.

Quote:
Seems to me that changing V2 (on the Supertotem schematic) to a set of pentodes would make it work better. V2a would act as a true current source load, giving V1a higher gain and better linearity. V2b would have more gain to degenerate locally as a cathode follower.
Adding complexity to try to extract more gain inevitably compromises parameters elsewhere...
In most cases and to my ears most importantly, a simple SRPP stage often sounds better than a u-follower.
It seems to me that most people are drawn in by the fact that it has higher gain compared to the SRPP...

In the meantime they forget that gain always comes at a price; if you want supergain go for a penthode or a cascode stage.
And we all know how linear those are, don't we?

Oh, while on cascodes, there's only a handful of tubes that are really suited for this service and you'd better study the datasheets, preferably the ones from the manufacturer of the tube you plan to use...Which is never a bad idea in any case.

So unless I have a very specific use for it, I simply don't even consider it.

All of which is just my not so humble opinion of course

Cherio,
__________________
Frank
  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



New To Site? Need Help?

All times are GMT. The time now is 02:36 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