RS1003 in SE triode-UL monoblocks - 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 21st May 2012, 08:31 AM   #1
davorin is offline davorin  Croatia
diyAudio Member
 
Join Date: Aug 2005
Location: Zadar, Croatia
Default RS1003 in SE triode-UL monoblocks

Just finished monoblocks with RS1003 ( SRS551) tube in SE-ClassA triode (option UL) connection. For drive tube I use EL803 (EL83 or EL803S) tube in triode connection. Also build in switch for LOW/HIGH output power for spare tube life time. Output power is 11W or 15W in triode connection, and 16W or 22W in UL connection. UL tape is at 25% turns of output transformer (closer to pentode connection), so I must use SHADE-feedback to reduce gain and distorsions.
Attached Images
File Type: jpg 004c.jpg (140.2 KB, 1092 views)
File Type: jpg 014a.jpg (133.8 KB, 1014 views)
File Type: jpg 012a.jpg (163.0 KB, 940 views)
  Reply With Quote
Old 21st May 2012, 09:07 AM   #2
diyAudio Member
 
Join Date: Aug 2008
My comment is only about safety.
I notice you lift the connection to Earth at the chassis! This makes it unsafe,
If you want to break ground loops, lift the (-) on the input, nevet the Safety Earth!
  Reply With Quote
Old 21st May 2012, 09:37 AM   #3
davorin is offline davorin  Croatia
diyAudio Member
 
Join Date: Aug 2005
Location: Zadar, Croatia
Quote:
Originally Posted by costis_n View Post
My comment is only about safety.
I notice you lift the connection to Earth at the chassis! This makes it unsafe,
If you want to break ground loops, lift the (-) on the input, nevet the Safety Earth!
On the back side of chassis, there is terminal for separate wire for grounding.
Also, You can see previous version of frame.
Attached Images
File Type: jpg 008a.jpg (129.8 KB, 857 views)
  Reply With Quote
Old 21st May 2012, 05:28 PM   #4
diyAudio Member
 
Join Date: Apr 2009
Great job Davorin ... please tell more about your impressions how it sounds ...
__________________
tubes.rs
  Reply With Quote
Old 21st May 2012, 05:59 PM   #5
davorin is offline davorin  Croatia
diyAudio Member
 
Join Date: Aug 2005
Location: Zadar, Croatia
Sonds very good, more like some other bigger transmitting tubes with direct heating, not like 2-3 paralell connecteed EL34, KT88 or GU50 tubes.
In triode connection sunds like 811A or 812A, but with less distorsion. UL-connection provide much more power, and can drive less sensitive speakers. Less detail than triode connect, but with BIGG sound for rock, metal and simphonical music.
  Reply With Quote
Old 21st May 2012, 07:08 PM   #6
Tajzmaj is offline Tajzmaj  Slovenia
diyAudio Member
 
Join Date: Mar 2011
Location: Ljubljana
Nice one...
  Reply With Quote
Old 21st May 2012, 07:26 PM   #7
diyAudio Member
 
Join Date: Nov 2008
Location: 135200
Quote:
Originally Posted by davorin View Post
Sonds very good, more like some other bigger transmitting tubes with direct heating, not like 2-3 paralell connecteed EL34, KT88 or GU50 tubes.
In triode connection sunds like 811A or 812A, but with less distorsion. UL-connection provide much more power, and can drive less sensitive speakers. Less detail than triode connect, but with BIGG sound for rock, metal and simphonical music.


Hello!
I love this lamp RS1003 and congratulations for this achievement.
What would be equivalent to EL803, or could be replaced this lamp???
What about the scheme designed by me?
EF80 is galvanic coupling advantage is a very good response in low frequencies.
The disadvantage is that the anode voltage to be coupled after the tubes were heated
Attached Images
File Type: png RS1003 SE 15W.png (49.2 KB, 865 views)
  Reply With Quote
Old 21st May 2012, 07:30 PM   #8
diyAudio Member
 
Join Date: May 2012
Quote:
Originally Posted by davorin View Post
Just finished monoblocks with RS1003 ( SRS551) tube in SE-ClassA triode (option UL) connection. For drive tube I use EL803 (EL83 or EL803S) tube in triode connection. Also build in switch for LOW/HIGH output power for spare tube life time. Output power is 11W or 15W in triode connection, and 16W or 22W in UL connection. UL tape is at 25% turns of output transformer (closer to pentode connection), so I must use SHADE-feedback to reduce gain and distorsions.
Do you have a link to a spec sheet on this tube? Looks pretty interesting.
  Reply With Quote
Old 21st May 2012, 07:56 PM   #9
diyAudio Member
 
Join Date: Nov 2008
Location: 135200
Quote:
Originally Posted by Roger R View Post
Do you have a link to a spec sheet on this tube? Looks pretty interesting.


these data will be helpful?

or equivalent to RS1003 is SRS551 find here:

Scheidig Rhrensammlung: Senderoehren: SRS 551 Letztes Update: Sat Jan 10 13:14:01 2009
Attached Images
File Type: gif RS1003.gif (51.6 KB, 509 views)

Last edited by LAZAROIU; 21st May 2012 at 08:01 PM.
  Reply With Quote
Old 21st May 2012, 08:07 PM   #10
davorin is offline davorin  Croatia
diyAudio Member
 
Join Date: Aug 2005
Location: Zadar, Croatia
Quote:
Originally Posted by LAZAROIU View Post
Hello!
I love this lamp RS1003 and congratulations for this achievement.
What would be equivalent to EL803, or could be replaced this lamp???
What about the scheme designed by me?
EF80 is galvanic coupling advantage is a very good response in low frequencies.
The disadvantage is that the anode voltage to be coupled after the tubes were heated
EF80 is good drive for UL connection output tube, but in triode connection there is much more capacitance (total input capacitance of RS1003~150pF including Miller) , and You need tube with less internal resistance for drive.
Good substitute for EL803(S) is EL83, 6CK6, and cheep russian 6P15S. Also new production (actual) is SV83 (SVETLANA).
Gain of output tube in triode connection is ~20-21x, and for normal input sesitivity (~1Veff) You need drive element with total gain about ~12x(including SHADE feedback). You can use 1/2 double-triode tubes(6SN7, 6CG7, 6FQ7, E80CC etc.; russian 6N6P and 6N30P) and many tubes with single triode in sistem with same caracteristic like 6J5GT.
At first, I try with triode connection E80F(~EF86) and 5879 tubes with very good sounds at low power, but more distorsions at higher levels as triode conection output tube. Also try triode connection EL84(6BQ5) and 6BW6(noval version of 6V6). Booth have perfect caracteristic and sound, but too low gain (~6-8x).
You can try 6CL6, caracteristics in triode mode are near EL83, and any video output pentode/tetrode from old B&W-TV sets.

Last edited by davorin; 21st May 2012 at 08:15 PM.
  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
Triode VS. UL bias gtrmkr Tubes / Valves 5 2nd May 2011 10:35 PM
UL - triode switch torrence Tubes / Valves 2 7th July 2008 10:58 AM
converting UL in triode overdrajv Tubes / Valves 11 25th December 2007 06:21 AM
UL to triode kathodyne Tubes / Valves 55 21st August 2005 10:05 PM


New To Site? Need Help?

All times are GMT. The time now is 04:12 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