#26 pre amp - Page 282 - 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 March 2013, 07:18 PM   #2811
diyAudio Member
 
merlin el mago's Avatar
 
Join Date: Sep 2009
Location: Catalonia - Europe
I think 2 or max 3mA each but how can calculate exactly?
  Reply With Quote
Old 21st March 2013, 07:20 PM   #2812
iko is offline iko  Canada
diyAudio Moderator
 
iko's Avatar
 
Join Date: May 2008
Location: Toronto
You just measured it. It's the voltage across the 100R resistor, divided by 100.

In my opinion it would be easier for you to use a VR150 tube with a DN2540 CCS, than the Salas shunt reg. Normally I would recommend the shunt reg, but look what troubles you already had with this circuit.
  Reply With Quote
Old 21st March 2013, 07:24 PM   #2813
diyAudio Member
 
merlin el mago's Avatar
 
Join Date: Sep 2009
Location: Catalonia - Europe
Thanks Iko

left channel 6,6mA
right channel 4,9mA

So if I will use SSHV2 I have to adjust for 31,5mA, is a pleasure to learn.
  Reply With Quote
Old 21st March 2013, 07:29 PM   #2814
stajo is offline stajo  Sweden
diyAudio Member
 
Join Date: Jun 2011
Location: Stockholm
Quote:
Originally Posted by ikoflexer View Post
In my opinion it would be easier for you to use a VR150 tube with a DN2540 CCS, than the Salas shunt reg. Normally I would recommend the shunt reg, but look what troubles you already had with this circuit.
I'd say first measure the ripple wtth the scope before the 15/20k resistors, because that is what the shunt/CSS/gyrator whatever has to deal with. You know the current Then ask the big guys, not me. I'm not your man on that
  Reply With Quote
Old 21st March 2013, 07:36 PM   #2815
diyAudio Member
 
merlin el mago's Avatar
 
Join Date: Sep 2009
Location: Catalonia - Europe
Quote:
Originally Posted by ikoflexer View Post
You just measured it. It's the voltage across the 100R resistor, divided by 100.

In my opinion it would be easier for you to use a VR150 tube with a DN2540 CCS, than the Salas shunt reg. Normally I would recommend the shunt reg, but look what troubles you already had with this circuit.
I have two SSHV2 working without any problem: one in Valve Itch and another a ECC81 mu follower lineamp

For 26 due to the fact I bought a small chassis by my mistake I want try other kind of reg like your CCS+gyrator, I ask again: can I use it togheter the OPT or you believe better to avoid and go for SSHV2 or VR150 tube with DN2450?

TIA

N.B. Don't worry Iko, troubles is my way to learn.
  Reply With Quote
Old 21st March 2013, 07:37 PM   #2816
stajo is offline stajo  Sweden
diyAudio Member
 
Join Date: Jun 2011
Location: Stockholm
SSHV2 goes well with OPT, 99% certain but you can never know. If you have problems theres always master Salas. I dont know about the gyrator. CSS+shunt or shunt+CSS, thats what SSHV is.

Last edited by stajo; 21st March 2013 at 07:40 PM.
  Reply With Quote
Old 21st March 2013, 07:39 PM   #2817
diyAudio Member
 
merlin el mago's Avatar
 
Join Date: Sep 2009
Location: Catalonia - Europe
Or VR150 + DN2450 as Iko suggested and if I don't want to change the chassis I only have two alternatives:

VR150 + DN2450
CCS + Gyrator
  Reply With Quote
Old 21st March 2013, 07:40 PM   #2818
iko is offline iko  Canada
diyAudio Moderator
 
iko's Avatar
 
Join Date: May 2008
Location: Toronto
Either use Salas' shunt, or use a VR150 tube. Forget the gyrator, that's TO REPLACE the output transformer, which you want to keep.
  Reply With Quote
Old 21st March 2013, 07:45 PM   #2819
stajo is offline stajo  Sweden
diyAudio Member
 
Join Date: Jun 2011
Location: Stockholm
VR150 + DN2450 would be my cup of tea, depending on my level of noice kill. with higher ripple SSHV2. There you have an out of the box well singing solution. Shunt + CSS is for learning, expect some trouble
  Reply With Quote
Old 21st March 2013, 07:47 PM   #2820
diyAudio Member
 
merlin el mago's Avatar
 
Join Date: Sep 2009
Location: Catalonia - Europe
So only one winner VR150, where can buy cheap? any prefered manufacturer and ebay trust seller?
  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 03:52 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