Go Back   Home > Forums > >
Home Forums Rules Articles diyAudio Store Blogs Gallery Wiki Register Donations FAQ Calendar Search Today's Posts Mark Forums Read

Solid State Talk all about solid state amplification.

tube-like SS power amp
tube-like SS power amp
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 9th April 2009, 08:44 PM   #11
wg_ski is offline wg_ski  United States
diyAudio Member
 
Join Date: Oct 2007
Quote:
Originally posted by Bigun
Why not build a hybrid, with tube input stage and SS power output stage for best of both worlds?

Carefully designed, maybe. You'll have to design the tube stage to be the limiting mechanism to truly get the 'tube sound'. If you let the SS amp clip, it will still sound like a SS amp clipping. If your 12ax7 or 6sn7 or whatever front end soft limit below clipping you'll probably get the sound you're after.
  Reply With Quote
Old 9th April 2009, 09:02 PM   #12
Bigun is offline Bigun  Canada
diyAudio Member
 
Bigun's Avatar
 
Join Date: Jan 2009
Location: Waterloo, ON or Herefordshire UK
tube-like SS power amp
Good point.

I still have a mountain of work to build the 5 channel TGM amplifier before I start playing with a hybrid. But my initial thought was to build two single-channel amps. Both with same PSU and same SS output stage. The output stage should not be a limiting factor as you say. The input stage of one will have a JFET biassed so that it works in 'triode mode' (I won't say more on that other than to refer to Nelson) and the other will have a tube.

The tube has some specific power supply requirements. But I have a good friend with a bag of special Russian tubes that are about the size of a transistor. They are in metal cans. They run off low voltage. I think Musical Fidelity had these once too. Anyhow, they may not have the reputation of a specific NOS glass valve, but they for sure have the response curve of a triode. At least this is the thought de jour.
__________________
"The test of the machine is the satisfaction it gives you. There isn't any other test. If the machine produces tranquility it's right. If it disturbs you it's wrong until either the machine or your mind is changed." Robert M Pirsig.
  Reply With Quote
Old 9th April 2009, 09:07 PM   #13
Bigun is offline Bigun  Canada
diyAudio Member
 
Bigun's Avatar
 
Join Date: Jan 2009
Location: Waterloo, ON or Herefordshire UK
tube-like SS power amp
p.s. Most certainly I am not a big fan of Class A 'room heaters' with little output power. I am suggesting Class AB with SS output.
__________________
"The test of the machine is the satisfaction it gives you. There isn't any other test. If the machine produces tranquility it's right. If it disturbs you it's wrong until either the machine or your mind is changed." Robert M Pirsig.
  Reply With Quote
Old 9th April 2009, 09:31 PM   #14
nigelwright7557 is offline nigelwright7557  United Kingdom
diyAudio Member
 
nigelwright7557's Avatar
 
Join Date: Apr 2008
Location: Carlisle, England
Default Re: tube-like SS power amp

Quote:
Originally posted by rtill
Just curious if there is any SS power amp out there that may have a tube-like warm sound or qualities.

A good approxcimation of a valve sound can be got with a soft limiter. Use tthat in conjunction with a standard SS amp.

I no longer have any cct diagrams of one but a Google search will bring up loads of soft limiters. It can certainly be done with an op-amp, a couple of transistors and a few more components and is much cheaper than a valve pre-amp or power amp.
__________________
PCBCAD51 pcb design software. 2018 version out now with lower prices >> http://www.murtonpikesystems.co.uk
  Reply With Quote
Old 10th April 2009, 04:25 PM   #15
kenpeter is offline kenpeter  United States
diyAudio Member
 
Join Date: Nov 2007
Location: Dallas
Soft limiters usually only interact with the source.
Where a tube final interacts mostly with the load.
And there are enough exceptions that neither is
a statement of unshakable rule.

Makes no diff one way or the other into an 8 ohm
dummy load. But significant difference when a real
loudspeaker is the load.

You can certainly do this entirely with SS, just don't
dumb down to a soft limiter up front and linear final.
The difference between an "effect" and an "amp".
  Reply With Quote
Old 10th April 2009, 08:37 PM   #16
nigelwright7557 is offline nigelwright7557  United Kingdom
diyAudio Member
 
nigelwright7557's Avatar
 
Join Date: Apr 2008
Location: Carlisle, England
Quote:
Originally posted by kenpeter
Soft limiters usually only interact with the source.
Where a tube final interacts mostly with the load.
And there are enough exceptions that neither is
a statement of unshakable rule.

Makes no diff one way or the other into an 8 ohm
dummy load. But significant difference when a real
loudspeaker is the load.

You can certainly do this entirely with SS, just don't
dumb down to a soft limiter up front and linear final.
The difference between an "effect" and an "amp".

I used a soft limiter with a pot to vary the feedback and got great results. Certainly a lot cheaper than buying a valve amp.
__________________
PCBCAD51 pcb design software. 2018 version out now with lower prices >> http://www.murtonpikesystems.co.uk
  Reply With Quote
Old 12th April 2009, 12:46 AM   #17
slideman82 is offline slideman82  Argentina
diyAudio Member
 
Join Date: Oct 2007
Quote:
Originally posted by rtill
looking for that natural tube-warmth sound. Guess I'm looking for maybe an emulation of a tube power amp using SS parts. Maybe a type of FET power amp....
I've built Flavio Dellepiane's 60W mosfet power amp with common IRF's and sounds excellent! I use it as guitar amp, and when I overload the input, crunches really nice! Try it, it's placed in www.redcircuits.com
  Reply With Quote
Old 12th April 2009, 12:53 AM   #18
AKSA is offline AKSA  Australia
diyAudio Member
 
Join Date: Sep 2001
Location: Melbourne, Australia
SS amps can be made to sound almost like a good tube amp if H2 and H3 is injected into the mix in very small quantities, around 0.05%.

Hugh
__________________
Aspen Amplifiers P/L (Australia)
www.aksaonline.com
  Reply With Quote
Old 12th April 2009, 02:05 AM   #19
tinitus is offline tinitus  Europe
diyAudio Moderator R.I.P.
 
Join Date: Nov 2005
tube-like SS power amp
Maybe the new coming "Trust" by Carlos
__________________
sometimes we know very little, and sometimes we know too much
  Reply With Quote
Old 12th April 2009, 03:21 AM   #20
wg_ski is offline wg_ski  United States
diyAudio Member
 
Join Date: Oct 2007
Quote:
Originally posted by tinitus
Maybe the new coming "Trust" by Carlos

Not quite. Carlos said the Trust's weak point was its clipping behavior. That's where tubes are usually better than SS - in overload.
  Reply With Quote

Reply


tube-like SS power ampHide 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

Forum Jump

Similar Threads
Thread Thread Starter Forum Replies Last Post
could 24A been power tube sam8888ysl Tubes / Valves 29 14th December 2016 01:05 AM
any way to fix a end cap on a 807 power tube karma Tubes / Valves 9 9th September 2005 02:39 AM
ECL 82 low power end tube Maarten Tubes / Valves 84 14th February 2004 12:46 PM
tube/SS hybrid (low power)- need tube help trespasser_guy Tubes / Valves 26 6th July 2003 07:15 PM


New To Site? Need Help?

All times are GMT. The time now is 09:05 AM.


Search Engine Optimisation provided by DragonByte SEO (Pro) - vBulletin Mods & Addons Copyright © 2018 DragonByte Technologies Ltd.
Resources saved on this page: MySQL 15.00%
vBulletin Optimisation provided by vB Optimise (Pro) - vBulletin Mods & Addons Copyright © 2018 DragonByte Technologies Ltd.
Copyright ©1999-2018 diyAudio
Wiki