Is single ended Class A better than push-pull? - Page 5 - 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 27th August 2005, 07:36 PM   #41
Variac is offline Variac  United States
diyAudio Editor
 
Variac's Avatar
 
Join Date: Dec 2001
Location: San Francisco, USA
That was Mark Twain AFAIR.
Yup the turistas always are shivering all over the place in the summer, with the wind and fog. The "San Francisco" sweatshirt salespeople make a fortune..

October is about the best month to visit here.
  Reply With Quote
Old 27th August 2005, 08:11 PM   #42
diyAudio Member
 
Steve Eddy's Avatar
 
Join Date: Sep 2002
Location: Sacramento, CA
Quote:
Originally posted by Variac
That was Mark Twain AFAIR.
Yeah, that's what I thought too but when I Googled it, it seems that while the quote has been attributed to Twain, it hasn't been able to be verified. One site said that he'd said something a bit similar about Paris.

Quote:
Yup the turistas always are shivering all over the place in the summer, with the wind and fog. The "San Francisco" sweatshirt salespeople make a fortune..
Hehehe. I'm sure they do.

But then when you folks get a hot spell, like over 90 degrees, y'all start dropping like flies and they send out the Soylent Green trucks to scoop y'all up.

Quote:
October is about the best month to visit here.
Having spent sub-zero winters in Nevada and Utah, I've found it quite pleasant there every time I've visited.

se
  Reply With Quote
Old 27th August 2005, 08:36 PM   #43
SY is offline SY  United States
diyAudio Moderator
 
SY's Avatar
 
Join Date: Oct 2002
Location: Chicagoland
Blog Entries: 1
Variac, you're in an odd spot. It's ******* warm on this side of the Bay. Even warmer where Steve is. The lab is already too darn hot just from my little tube amp...

Get a thousand watts of heat going in a room and it will quickly be too warm even in Germany.

Excuse me, I have to go outside and sweat.
__________________
You might be screaming "No, no, no" and all they hear is "Who wants cake?" Let me tell you something: They all do. They all want cake.- Wilford Brimley
  Reply With Quote
Old 27th August 2005, 08:53 PM   #44
Variac is offline Variac  United States
diyAudio Editor
 
Variac's Avatar
 
Join Date: Dec 2001
Location: San Francisco, USA
Quote:
Odd Spot
I resent your constant SF Bashing
At least I have the sense to live in a spot with decent coooooool weather.


I went to college in Davis, lived in Houston and Atlanta and Wash DC so I know hot- humid and otherwise....

  Reply With Quote
Old 28th August 2005, 01:03 AM   #45
SY is offline SY  United States
diyAudio Moderator
 
SY's Avatar
 
Join Date: Oct 2002
Location: Chicagoland
Blog Entries: 1
Believe me, I'm envious. The City is one of the finest places on earth.
__________________
You might be screaming "No, no, no" and all they hear is "Who wants cake?" Let me tell you something: They all do. They all want cake.- Wilford Brimley
  Reply With Quote
Old 28th August 2005, 06:32 PM   #46
Account Disabled
 
Join Date: Aug 2005
Default new single end design

hi, how are you?

a new single end class a design, it could be replace by tubes.

have a good week end !
Attached Images
File Type: gif p83-f3.gif (4.9 KB, 278 views)
  Reply With Quote
Old 29th August 2005, 12:48 AM   #47
arnoldc is offline arnoldc  Philippines
diyAudio Member
 
Join Date: Apr 2003
Location: Makati
Send a message via Yahoo to arnoldc
Sy, Ec8010, thanks much. I'll look at the Curcio designs.

Cheers!
  Reply With Quote
Old 29th August 2005, 03:33 AM   #48
diyAudio Member
 
Join Date: Oct 2004
Location: Adelaide South Oz
Default Hey Bandersnatch

I've seen your method of connecting the driver anodes to the UL taps before. A nice way of getting a more linear feedback than standard Ultralinear. Can you tell us your impressions of this arrangement vs standard Ultralinear?
Did you do any measurements or just (the vital) listening tests? I'm particularly interested on what effect it had on output impedance and total power.
Cheers,
Ian
  Reply With Quote
Old 29th August 2005, 10:26 AM   #49
diyAudio Member
 
Join Date: Jul 2003
Location: Ann Arbor, MI
Hey-hey!!!,
I don't find that the front end does anything for power( unless it won't swing the voltage ). This one has no troubles with voltage output.

I have not done much measurements. I was hunting a simple circuit for stacked Quad 57's. With the circuit as drawn, there is a damping factor of ~2 with 6BQ7's, 1619's and 9k a-a. It did not quite do the HF well enough.

Sooo, more NFB from what amounts to the same circuit.
Go here:
http://audioroundtable.com/GroupBuild/Projects/

Look at the Merlin amp. The differential cascode front end has a bit of added complexity but sounds fantastic. With 6J6/6H6Pi, HY69's and the 10k 40W Peerless S265Q it makes ~10W with a 300V B+. E-Linear on 30%. At 50% you'll be making 6W( but you can do it with an original,in-the-can OPTx and not have to get a modern rewind/copy ).

The cascode/faux pentode does the phase splitting better than pentodes so far, and offers high output Z for more NFB than a triode would. It rocks quads. You can build this with any multi-grid. I am running the cheaper, 12V, slightly higher gm, HY1269 now. This one likes a little more B+, so a redesign is in the works.

Drop me a line, we can exchange numbers and speak at length. This all bears my copyright.
regards,
Douglas
__________________
the Tnuctipun will return
  Reply With Quote
Old 1st September 2005, 07:26 PM   #50
diyAudio Member
 
triode_al's Avatar
 
Join Date: May 2004
Location: Westland
Blog Entries: 1
Quote:
Originally posted by Miles Prower
is single end class a better than push - pull?
Push-pull has certain advantages.-- Balanced operation also eliminates (or nearly so) even order harmonics, making for cleaner output.
Thanks to a distortion analyser I have been able to view the distortion life of a PP preamplifier. Symetric start to finish. The second stage allowed a bias per tube. Of course I expected nasty 3rd harmonics. But what I saw was that the disbalance in the output allowed me to gently 'select' a niice distortion makeup (predominant 2nd harmonics) even thought both stages were long-tailed. (6J6 in, E90CC out). The preamp works nice for over 10 years.
Also the French writer in L'Audiophile, Héphaistos, showed such beneficial results in differential pairs by 'wrong biasing'.

My lesson: yes, in theory 2nd Harmonics cancels out, but by tweaking you can dial it back in. This is of course the 'bricolage' approach to building.
__________________
DAC TDA1541 S1; Kondo post-I/V filter; MC30-Super --> two stage RIAA; Pre: SP-6 clone ; F5 ; 300B PP ; ESL 57
  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
push pull Vs single ended class A amp space2000 Solid State 25 23rd August 2008 03:31 PM
Single-ended OR push-pull? kacernator Tubes / Valves 48 31st March 2008 02:50 PM
Single ended amp from class A push-pull Wavebourn Tubes / Valves 2 12th October 2007 09:14 PM
Parallel single ended or push-pull? Jeffy74 Tubes / Valves 6 12th February 2004 06:04 AM


New To Site? Need Help?

All times are GMT. The time now is 09:42 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