The Pass Monster? - Page 26 - diyAudio
Go Back   Home > Forums > Amplifiers > Pass Labs

Pass Labs This forum is dedicated to Pass Labs discussion.

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 29th January 2005, 06:39 PM   #251
diyAudio Member
 
SmarmyDog's Avatar
 
Join Date: Jul 2003
Location: San Diego, CA
Hereís a quick status report on what Iím up to:

* We have a preliminary schematic for the output section so I purchased 3000 TO-3P transistors to begin matching. Tedious work by the way Ė Iíll need plenty of English Breakfast tea (cream and sugar, please).

* I procured eighteen aluminum plates, each 18Ē wide by 28Ēdeep by ľĒ thick. Each of the 6 monoblocks will consist of three chassis (see sketches below) and each chassis will contain one of these plates as the main structural mounting plane. Zero and I are fine-tuning the layout of the innards, and then Iíll have the plates CNC-machined.

* Iím about 1/3 of the way through re-forming the 240 26mF, 250V capacitors.

* I have everything kitted to build the power supplies except for the inductors.

All for now Ė I have three little boys that want to go play at the (sunny, warm) beachÖ

PS: Grey, Iím having trouble finding sockets for the power supply regulation tubes (see below). Do you have any spares?

-Casey Walsh
Attached Images
File Type: jpg passtube.jpg (83.6 KB, 950 views)
  Reply With Quote
Old 29th January 2005, 06:40 PM   #252
diyAudio Member
 
SmarmyDog's Avatar
 
Join Date: Jul 2003
Location: San Diego, CA
Chassis sketch...
Attached Images
File Type: jpg chassis 002.jpg (58.5 KB, 889 views)
  Reply With Quote
Old 29th January 2005, 06:43 PM   #253
diyAudio Member
 
SmarmyDog's Avatar
 
Join Date: Jul 2003
Location: San Diego, CA
Innards sketch...
Attached Images
File Type: jpg chassis 002 (innards).jpg (88.1 KB, 851 views)
  Reply With Quote
Old 31st January 2005, 03:14 AM   #254
diyAudio Member
 
Join Date: Feb 2001
Location: Columbia, SC
I have a topology I'm semi-pleased with, at least on paper. I'll try to get to the soldering iron phase as soon as possible, but it's gotten to the point where I can only work at this stuff on the weekends, and sometimes not even then. I manage an hour or two on random weekdays...
For what it's worth, I'm planning on using a 1:1 isolation transformer and a voltage doubler to get the rail voltage. That way things aren't limited to "tube" transformers. Isolation transformers are fairly easy to come by.

Grey
  Reply With Quote
Old 31st January 2005, 04:39 AM   #255
diyAudio Member
 
Join Date: Dec 2004
Location: Overland Park, KS
Default Swarmy's caps.

I just aquired 17 caps, they are 1900ufd at 450volts. Would that be easier than the bulk of smaller caps? Regards, Steve
__________________
Finding new ways for the extreme mis-application of high tech!
  Reply With Quote
Old 31st January 2005, 05:12 AM   #256
diyAudio Member
 
SmarmyDog's Avatar
 
Join Date: Jul 2003
Location: San Diego, CA
gearheaddruid: With all of those 600V, 75A industrial MOSFET's and your stack of 3.5KVA toroidal trafos laying around it seems you're in a position to build a few monoblock that you could rate in horsepower.

Regarding the capacitors in the sketches, each amp contains forty 26mF, 250VDC screw-terminal electrolytics, which adds up to over 1 Farad per amp. Each capacitor is 3" in diameter and 9" tall.

-Casey Walsh
  Reply With Quote
Old 31st January 2005, 05:17 AM   #257
Coulomb is offline Coulomb  England
diyAudio Member
 
Coulomb's Avatar
 
Join Date: Jul 2002
Location: Ancaster, Ontario
Quote:
Originally posted by SmarmyDog
gearheaddruid: With all of those 600V, 75A industrial MOSFET's and your stack of 3.5KVA toroidal trafos laying around it seems you're in a position to build a few monoblock that you could rate in horsepower.

Regarding the capacitors in the sketches, each amp contains forty 26mF, 250VDC screw-terminal electrolytics, which adds up to over 1 Farad per amp. Each capacitor is 3" in diameter and 9" tall.

-Casey Walsh
When you say 26 mF do you mean to say they are 26,000 uF?

Regards

Anthony
__________________
I like to stay current!
  Reply With Quote
Old 31st January 2005, 05:17 AM   #258
diyAudio Member
 
audiousername's Avatar
 
Join Date: Jul 2004
Location: Melbourne, Victoria
Casey,

The one on the left looks like it has the base of a 212, but what on earth are those valves?
__________________
Jason
  Reply With Quote
Old 31st January 2005, 05:44 AM   #259
diyAudio Member
 
Join Date: Dec 2004
Location: Overland Park, KS
Default Capacitors.

Smarmy, my mistake, I wish they had taught me the Metric system better in grade school. I took that as 26ufd. Scratch the caps, I'll find some tube person to sell them to.
I am just starting on my kid's gaming room. Video projector, a custom switch system for all the games, BIG subwoofer, and of course some amp muscle. I am not building any real large amps right now as I need money for my other vice: going fast! Got a couple of projects in the garage I want done by spring. Regards, Steve
__________________
Finding new ways for the extreme mis-application of high tech!
  Reply With Quote
Old 31st January 2005, 06:07 AM   #260
diyAudio Member
 
SmarmyDog's Avatar
 
Join Date: Jul 2003
Location: San Diego, CA
Coulomb: Yes, I mean 26,000uF. I sípoze I should use the more widely accepted uF convention since Iíve seen many capacitors actually use the milli-prefix Ďmí for microfarads. Anyway, we have one Coulomb of charge per volt in our capacitor bank.

Audiousername: Sorry to mess with ya. The tube on the right is actually a CRT from some very old piece of test equipment. The one on the left I picked up at a garage sale many years ago because it looked cool. Iíve never actually designed any tube circuits, but if Grey is serious about trying a tube front-end for Le Monstre, Iím very interested in learning!

Gearheaddruid: So, whatís going on in the garage? My 1995 ZR-1 Corvette got ďupgradedĒ to a minivan when things became er, um, family-oriented.

-Casey Walsh
  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
Pass Monster????? kilowattski Pass Labs 29 31st July 2005 05:01 AM


New To Site? Need Help?

All times are GMT. The time now is 11:55 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