SE Mosfet line stage with transformer output - diyAudio
Go Back   Home > Forums > Amplifiers > Solid State

Solid State Talk all about solid state amplification.

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 26th November 2011, 03:06 PM   #1
diyAudio Member
 
Join Date: Sep 2003
Location: London
Default SE Mosfet line stage with transformer output

I build with tubes and am fairly new to solid state. Can anyone suggest a simple SE line stage with gain using one Mosfet that could be used into a line OPT which would act as a phase splitter and give balanced output to a power stage?

I'm particularly interested in the latest Mosfets, and specially the Semisouth devices which can be used at 300v HT supply or even more. I have various interstages like Lundahl LL1671/PP, LL1660/18mA, LL1692A/10mA

SiC Transistors | Semisouth Laboratories, Inc.

I'm sure there's a simple circuit possibility for the above SIC devices, I just don't have the familiarity with biasing such devices. I can use my tube preamp HT supply, but my available transformers stop at 18mA gap. I'd also welcome suggestions for other transformer outputs to use with such SIC devices or other good sounding Mosfets at various supply voltages and currents. My goal is balanced out, but I'd prefer a single device so I don't need to match them.

Andy
  Reply With Quote
Old 26th November 2011, 04:50 PM   #2
AndrewT is offline AndrewT  Scotland
diyAudio Member
 
Join Date: Jul 2004
Location: Scottish Borders
Use a SE to balanced output transformer.
But are they rated for approaching 300Vdc?
__________________
regards Andrew T.
  Reply With Quote
Old 26th November 2011, 08:30 PM   #3
diyAudio Member
 
Join Date: Sep 2003
Location: London
Yes - if you look at the Lundahl site you can see the specifications. The interstages I have are all for valve gear. So the SE primaries are rated for typical valve use - up to 18mA current. That's why I was considering Semisouth parts at higher voltages. Unfortunately they don't have sets of curves like valves do so you can't see bias voltage and current at e.g. 200v or 300v.

I suppose parafeed would be an option for the primary, though I'd prefer to avoid it.

Andy
  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
Line Stage for Mikael SE KT88 cjctan Tubes / Valves 2 2nd June 2009 09:56 AM
Difference between SE output transformer and push-pull output transformers hilbert_mostert Tubes / Valves 12 8th March 2009 05:10 PM
3C24 in a SE output stage - output transformer impedance recommendation !!! aldovan Tubes / Valves 15 6th September 2008 10:18 AM
Mosfet output stage help (please) bob123 Class D 5 3rd January 2006 11:48 PM
Has anyone tried a low input capacitance MOSFET in a line stage preamp MIKET Pass Labs 2 27th August 2003 08:29 PM


New To Site? Need Help?

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


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