YASSE - Yet Another Simple SE Build - diyAudio
Go Back   Home > Forums > Commercial Sector > Vendor Forums > Tubelab

Tubelab Discussion and support of Tubelab products, prototypes and experiments

Reply
 
Thread Tools Search this Thread
Old 2nd November 2008, 01:40 AM   #1
N1ESE is offline N1ESE  United States
diyAudio Member
 
Join Date: Oct 2008
Default YASSE - Yet Another Simple SE Build

Well, time has come for me to start my own Tubelab.com Simple SE build thread. I ordered the board earlier this morning and George has already replied saying the board has shipped. How's that for customer service on a Saturday?

I've also ordered transformers, tubes, and most of the other components. I'm going to be running the following:

Hammond 374BX Power Transformer
Hammond 193D 8H, 150ma Choke
Edcor CXSE25-8-5K OPT's
ASC Metal Poly "Motor Run" Cap, 50 uF 440VAC

Tubes:
EH KT88's - Have a pair of cheap EL34's for initial "smoke testing"
EH 12AT7
Chinese GZ34/5AR4


More later, I'm sure.
  Reply With Quote
Old 2nd November 2008, 02:39 AM   #2
chrish is offline chrish  Australia
diyAudio Member
 
chrish's Avatar
 
Join Date: Oct 2003
Location: Sydney
I think you may have under specified your choke. KT88s are going to pull almost 80mA each if you use the recommended 560R cathode resistor. From memory, the constant current source for the 12AT7 is running around 10mA per side. That is going to be around 180mA total. Your choke is rated at 8H 150mA. Inductance will reduce with increasing current. Why not use a 193H 5H 200mA or 193J 10H 200mA?

80uF 500VAC motor run caps here foe $12. Work well, have used them several times.

Good luck with the project!

Chris
  Reply With Quote
Old 2nd November 2008, 02:48 AM   #3
N1ESE is offline N1ESE  United States
diyAudio Member
 
Join Date: Oct 2008
Quote:
Originally posted by chrish
I think you may have under specified your choke. KT88s are going to pull almost 80mA each if you use the recommended 560R cathode resistor. From memory, the constant current source for the 12AT7 is running around 10mA per side. That is going to be around 180mA total. Your choke is rated at 8H 150mA. Inductance will reduce with increasing current. Why not use a 193H 5H 200mA or 193J 10H 200mA?
Hmm, good point. You are probably right. Guess I better email AES to change my order before they ship.
  Reply With Quote
Old 2nd November 2008, 03:53 AM   #4
chrish is offline chrish  Australia
diyAudio Member
 
chrish's Avatar
 
Join Date: Oct 2003
Location: Sydney
http://stores.ebay.com/Capacitor-and-Craft-Farm

Sorry, that was the link I tried to post above.....
  Reply With Quote
Old 2nd November 2008, 04:11 AM   #5
N1ESE is offline N1ESE  United States
diyAudio Member
 
Join Date: Oct 2008
Thanks for the link Chris. Shipping @ $12.45 seems a bit much though. It can't weigh more than a pound, USPS tells me $4.80 from them to me. I already have the 50 uF, 440VAC unit I'll use for now. It can handle much more in DC voltage.
  Reply With Quote
Old 2nd November 2008, 06:16 AM   #6
DimZ is offline DimZ  Greece
diyAudio Member
 
Join Date: Nov 2007
Location: athens
Hi N1ESE, George replied to me too, my pcb's are on their way to Greece ....

have allready orderd from digikey the parts list and I'm trying to decide the transformers/choke combo

so far it looks like the 374BX is gonna be the power, the 193J the choke and probably the 1628 the output

good luck with ypur project ....
  Reply With Quote
Old 2nd November 2008, 07:33 AM   #7
N1ESE is offline N1ESE  United States
diyAudio Member
 
Join Date: Oct 2008
That's great jimazz. I've ordered everything except for my Edcor CXSE outputs. I have to call them first thing Monday morning to place my order. You should like the 1628SEA's if you go with them. I know George really likes those.
  Reply With Quote
Old 2nd November 2008, 01:37 PM   #8
diyAudio Member
 
tubelab.com's Avatar
 
Join Date: Jul 2005
Location: West Virginia panhandle
Quote:
You should like the 1628SEA's if you go with them. I know George really likes those.
After having some extended listening time with both transformers I like the Edcor CXSE's better than the Hammonds. The high frequency response is better on the Edcors. When auditioned on efficient speakers where the average power is low there is clarity and detail on the Edcors that just isn't there on the Hammonds. The Edcor is a more efficient transformer as well allowing slightly more power from the same amplifier as the Hammond. When cranked to the max the Hammonds have better bass and less distortion, but how often do you listen this way?
__________________
Too much power is almost enough! Turn it up till it explodes - then back up just a little.
  Reply With Quote
Old 2nd November 2008, 02:13 PM   #9
DimZ is offline DimZ  Greece
diyAudio Member
 
Join Date: Nov 2007
Location: athens
You think that the Edcor CXSE25-8-5K OPT's should be better with the 374BX for the simple se , with 8ohm speakers ?? What about 6ohm??

I see edcor has a dealer in Europe (Belgium), so I must mail them for info ....
  Reply With Quote
Old 2nd November 2008, 02:53 PM   #10
diyAudio Member
 
Ty_Bower's Avatar
 
Join Date: Mar 2007
Location: Newark, DE
Quote:
Originally posted by tubelab.com
When cranked to the max the Hammonds have better bass and less distortion, but how often do you listen this way?
I hardly ever listen that way. I usually turn it up till it explodes - then back up just a little.
  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
simple se build skipper Tubelab 151 2nd October 2009 01:47 PM
looking for simple speker build help colin.hepburn2 Full Range 19 20th September 2008 01:55 PM
a simple amplifier to build? testarossa2k Solid State 9 13th December 2006 09:30 PM


New To Site? Need Help?

All times are GMT. The time now is 07:44 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