Sakuma's bleeder tubes and series connected transfomers - Page 4 - 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 24th December 2012, 04:35 PM   #31
diyAudio Member
 
Chris Hornbeck's Avatar
 
Join Date: May 2011
Location: Little Rock
Quote:
Originally Posted by DF96 View Post
Audio seems to have become like the art world: the value of something seems to depend on who did it, rather than any intrinsic merit of form and design. If I put out a circuit like that everybody would rightly (and very promptly) tell me it was rubbish. Far east guru puts out the circuit and everybody worships; they assume that their own concerns about it are merely a sign of their own ignorance of the deeper things of audio. "He must have had a good reason for doing it that way".
Three or four decades later, Tom Wolfe's _The Painted Word_ is more relevant than ever. But now, it applies to everything.

Thanks,
Chris
  Reply With Quote
Old 17th September 2013, 09:20 AM   #32
diyAudio Member
 
Join Date: Dec 2011
The "Teacher" Sakuma, said that: -for an unknown reason to me, adding irons betwenn the stages help the tubes sound better-. He uses series connected transformers to match the signal as he also uses series trans to achieve double voltage for the power supply.
This trick it really works and it sounds maybe better than single transformers do!
Becides we also do this to the electrical enviroments...
Of course there should be lots of theory arguments to this, but the fact is the transformer's action
and behaviewr differs at the working position, so please no comment to the subject.
Regards, Angelos
  Reply With Quote
Old 17th September 2013, 12:58 PM   #33
DF96 is offline DF96  England
diyAudio Member
 
Join Date: May 2007
Quote:
Originally Posted by tassis
so please no comment to the subject.
I have nothing to add to my previous comments. This thread contains wisdom, but it doesn't come from the fanboys; they are still puzzled.
  Reply With Quote
Old 17th September 2013, 07:10 PM   #34
diyAudio Member
 
Miles Prower's Avatar
 
Join Date: May 2005
Location: USA
Blog Entries: 6
Quote:
Originally Posted by Vinylsavor View Post
Hi!

I just browsed Sakumas website and found some of his latest works. Sakuma is known for his unconventional circuits. He added some new twists to his latest builds.

There are 'bleeder tubes' added to provide some load to the power supply. Probably for stabilisation. But why use tubes instead of a plain resistor? He even uses expensive DHTs for this purpose like a WE300B here:

12AT7 / 841 SE phono preamplifier

There is even a transformer added as a load to the tube, with the secondary just grounded on both ends.

Here he uses a 50:

5691 / WE-102D SE phono preamplifier

This time even with an input transformer.

There is probably some reasoning behind it, did anybody read the MJ magazines in which these circuits got published? Was there an explanation why this was done?

Also quite interesting the use of several transformers connected in series as a load to enable transformer coupling of high rp tube like the 841:

841 SE Tone control and buffer amplifier

Best regards

Thomas
Active hum bucking circuits. As to why Sakuma would use the audiophool expensive types for this makes no sense, especially when vertical deflection triodes, or pseudotriodes from the 6AQ5, 6V6, or other 6V6-oids, would work just as well for this purpose. Since he's iso-ing both inputs and outputs with ISTs, he could have gone solid statey here and used a MOSFET.
__________________
There are no foxes in atheistholes
www.dolphin-hsl.com
  Reply With Quote
Old 17th September 2013, 10:22 PM   #35
kevinkr is offline kevinkr  United States
diyAudio Moderator
 
kevinkr's Avatar
 
Join Date: Sep 2004
Location: Boston, Massachusetts
Blog Entries: 6
You've missed the point, he's cooking and seasoning to taste, hence his choice of ingredients.
__________________
"Extraordinary claims require extraordinary evidence." - Carl Sagan
  Reply With Quote
Old 18th September 2013, 06:49 AM   #36
diyAudio Member
 
jazbo8's Avatar
 
Join Date: Jan 2011
Location: In Transient
Quote:
Originally Posted by kevinkr View Post
You've missed the point, he's cooking and seasoning to taste, hence his choice of ingredients.
Running the restaurant is his main business after all
  Reply With Quote
Old 18th September 2013, 10:08 AM   #37
diyAudio Member
 
jazbo8's Avatar
 
Join Date: Jan 2011
Location: In Transient
Sakuma Mini Audio Concert
  Reply With Quote
Old 18th September 2013, 01:58 PM   #38
Magz is offline Magz  United States
diyAudio Member
 
Join Date: Oct 2009
Location: New Jersey, USA
Quote:
Originally Posted by jazbo8 View Post
Five people in a room all trying very hard not to look at each other.
  Reply With Quote
Old 18th September 2013, 02:12 PM   #39
Salas is online now Salas  Greece
diyAudio Chief Moderator
 
Salas's Avatar
 
Join Date: Oct 2002
Location: Athens-Greece
Quote:
Originally Posted by Magz View Post
Five people in a room all trying very hard not to look at each other.
The Japanese are very passionate and artistic people. So much so they experience passion mainly esoterically with a sense of embarrassment when in public. Its a very different culture.
  Reply With Quote
Old 18th September 2013, 03:48 PM   #40
Defiant is offline Defiant  United States
diyAudio Member
 
Defiant's Avatar
 
Join Date: Oct 2011
Location: Somewhere in America
I'm with DF96 on this. The thinking that these circuits represent the discovery of some deep, unknown audio phenomena is total crap. This is the same kind of thing that sucks audiophools into spending $2000 on speaker cables, Shakti stones, and Bybee conditioners.
  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
CL ad for tubes in MA. FYI only. Not connected dbster Tubes / Valves 0 16th April 2011 07:07 PM
amplifier works connected to PC .. but not when connected to car radio anwaypasible Analog Line Level 1 2nd March 2011 07:42 PM
Glow tubes as series regs ? mach1 Tubes / Valves 4 28th April 2009 09:19 AM
Shuguang Treasure Series Tubes igrant Vendor's Bazaar 3 1st February 2009 05:53 AM
dual secondary transformer connected in series Leolabs Solid State 2 6th October 2006 11:38 PM


New To Site? Need Help?

All times are GMT. The time now is 11:21 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