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.

USSA-5 Build with Review
USSA-5 Build with Review
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 February 2019, 08:43 PM   #561
ClaudeG is offline ClaudeG
diyAudio Member
 
Join Date: Jan 2015
Hi Fab

Teasing teasing... USSPA 1... and 2! What are the differences?

I am likely to get involved into something I don't really need ;-)

Enjoy your WE

Claude
  Reply With Quote
Old 10th February 2019, 12:40 AM   #562
fab is online now fab  Canada
diyAudio Member
 
fab's Avatar
 
Join Date: Mar 2004
Location: Canada
USSA-5 Build with Review
Hi Claude
The difference between USSPA1 and 2 is about the same as between amplifiers FSSA1 and 2....
The Mosfet driver is replaced by darlington Sanken bjt. The result is a similar open loop gain for both USSPA versions. The main advantage is that this bjt is still in production compared to the obsolete mosfet....
Fab
__________________
My stuff USSA, FSSA: https://fabaudio.online
  Reply With Quote
Old 10th February 2019, 10:15 AM   #563
ClaudeG is offline ClaudeG
diyAudio Member
 
Join Date: Jan 2015
Many thanks Fab

Well, as long as they sound fab...ulous :-)
  Reply With Quote
Old 10th February 2019, 11:36 AM   #564
tomtest is offline tomtest  Germany
diyAudio Member
 
Join Date: Mar 2018
Location: Duesseldorf, Germany
USSA-5 Build with Review
Hi Claude,

Very interesting to read that you grow up in Düsseldorf. As a child I live in Mettmann and the last school years i was in Düsseldorf. After that I was a few years at the Wuppertal university. Today I live in Gerresheim a part of Düsseldorf. In which Part did you live? When my calculations are correct then you must be a child of the middle 70?
So we are nearly at the same age, maybe our ways have crossed without knowledge.

I have had a look after your loudspeakers, impressive ones (congratulations), and find following informations about a person who used them with a 15 W tube amplifier (in the response part). Infinity Renaissance 90

So my thought is it could be possible, maybe Fab knows something more about it. If I could help you feel free to ask me.

Schönen Sonntag
André
  Reply With Quote
Old 10th February 2019, 05:41 PM   #565
ClaudeG is offline ClaudeG
diyAudio Member
 
Join Date: Jan 2015
I was based initialy at Kaiserswerth, then at various locations as that place less and less affordable, finaly Krefeld and Bonn. I remember Gerresheim very well as I went to the French school in Grafenberg. I was born in 1970 and that school was neighbour of a German school, perhaps you were there???

Many thanks for the link, will look at it in detail! And, well, I am talking to Fab, more and more tempted given all the reports inclusive yours already

bb

Claude
  Reply With Quote
Old 12th February 2019, 12:34 AM   #566
fab is online now fab  Canada
diyAudio Member
 
fab's Avatar
 
Join Date: Mar 2004
Location: Canada
USSA-5 Build with Review
Default USSPA PCB

Tomtest and Ernst had their respective pcb shipped today.
I will send you a preliminary build manual this week.

Assanden you are next.
Fab
__________________
My stuff USSA, FSSA: https://fabaudio.online
  Reply With Quote
Old 12th February 2019, 12:49 AM   #567
meanie is offline meanie  Singapore
diyAudio Member
 
Join Date: Jul 2018
Location: Singapore
May i know if the heatsink dimension of 350x151x50mm is enough for use in this amp ?
Or should i go to the next size up 400x151x50mm ?

Thanks
__________________
Marantz 7 clone(25 years old) - Baby Huey EL34s - BA3 Preamp - ACA - PassF6 - Whammy - USSA5.0(in progress) - M2X(in progress)
  Reply With Quote
Old 12th February 2019, 02:00 AM   #568
fab is online now fab  Canada
diyAudio Member
 
fab's Avatar
 
Join Date: Mar 2004
Location: Canada
USSA-5 Build with Review
Hi meanie
350mm length heatsink is enough to run 25Wrms (max power) full class A into 8 ohms at lower than 50C. Into 4 ohms you will get half power in class A and more power than 25Wrms in class AB. But who listens to more than 12 Wrms on a daily basis....
Fab
__________________
My stuff USSA, FSSA: https://fabaudio.online
  Reply With Quote
Old 12th February 2019, 02:16 AM   #569
meanie is offline meanie  Singapore
diyAudio Member
 
Join Date: Jul 2018
Location: Singapore
Thanks Fab,

I will start posting pictures of my build process soon...

I intend to build it like the Pioneer M22 of the mid 80's design, semi open with torodial and capacitors in the middle section of the wooden platform.

Click the image to open in full size.
__________________
Marantz 7 clone(25 years old) - Baby Huey EL34s - BA3 Preamp - ACA - PassF6 - Whammy - USSA5.0(in progress) - M2X(in progress)
  Reply With Quote
Old 12th February 2019, 12:54 PM   #570
fab is online now fab  Canada
diyAudio Member
 
fab's Avatar
 
Join Date: Mar 2004
Location: Canada
USSA-5 Build with Review
Hi meanie
I had a look at the vintage M22 amp it had an original look, reminds me of McIntosh tube amp with big black transformers where your heat sinks are located.
Keep us posted
Fab
__________________
My stuff USSA, FSSA: https://fabaudio.online
  Reply With Quote

Reply


USSA-5 Build with ReviewHide 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
Odd Watt Audio Alpha Build and initial review cgnman59 Tubes / Valves 6 26th April 2017 04:12 AM
SMPS vs LINEAR PS: Let's build up a serious technical review-list Centvrion Power Supplies 18 7th March 2011 05:09 AM
Honest opinion (peer review) about this 4Way before I build it Yoshy Multi-Way 54 16th December 2010 07:37 AM


New To Site? Need Help?

All times are GMT. The time now is 12:00 PM.


Search Engine Optimisation provided by DragonByte SEO (Pro) - vBulletin Mods & Addons Copyright © 2019 DragonByte Technologies Ltd.
Resources saved on this page: MySQL 14.29%
vBulletin Optimisation provided by vB Optimise (Pro) - vBulletin Mods & Addons Copyright © 2019 DragonByte Technologies Ltd.
Copyright ©1999-2019 diyAudio
Wiki