Aleph 60 mystical resistors - 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 10th May 2002, 12:01 AM   #1
Gabster is offline Gabster  Canada
diyAudio Member
 
Gabster's Avatar
 
Join Date: Feb 2002
Location: MTL < QC < CAN
Default Aleph 60 mystical resistors

Hi,

Here're my last questions before I can buy all the stuff for my Aleph 60 and start the building process

1) What are the values of R1 and R8. There's only an * on the schematics?

2) R19 = 5622 = 5.622k = 5.62k ?

3) R21 = 1501 = 1.501k = 1.5k ?

4) On the Aleph 2, there was a thermistor in the power supply (plus the one to the ground). Why is this thermistor missing? Will the amp power up smoothly ?

5) Same question regarding the missing capacitor between C20 and Q4 (Aleph 60)?

6) Is it OK to use 5% 3W resistors?

thanks,
Gabriel
  Reply With Quote
Old 10th May 2002, 12:31 AM   #2
diyAudio Member
 
Karen's Avatar
 
Join Date: Sep 2001
Location: Foresthill, CA
For Aleph 60, R8 can be used to adjust any DC offset, if it occurs. R19 is 5.62K and R21 is 1.5K. Hope that helps.. Also, careful with the value of R19, this resistor sets the bias..
__________________
..K
  Reply With Quote
Old 10th May 2002, 01:13 AM   #3
diyAudio Member
 
Join Date: Feb 2001
Location: Columbia, SC
Warning: I'm short on sleep and cross-eyed as a result...
but I think R19 is more likely to be 56.2k
I used the Panasonic 3W resistors from Digikey; they're 5% and work just fine.
The thermistor is to slow inrush when you first turn the amp on. Feel free to put one in if you like. Either way, be sure to use a fairly hefty switch. If all else fails, buy a double pole switch and wire the two sides in parallel. The next step after that is to put a 600V .1uF (some people say .01uF) cap across the switch to suppress the spark as the switch makes or breaks contact. If you really want to guild the lily, build a slow start circuit or use a Variac to bring the thing up.
The cap can be added if you like. It's there for stability. I changed my mind about ten or twenty times as I was building my amps, eventually deciding not to put it in...but I hedged my bets by making a place for it on the circuit board, and bought the caps anyway just in case I decided to put them in late some Saturday night. Mine are stable, but then I run them into a very tame load--both pairs are pushing purely resistive drivers. If I were using electrostats or something really freaky, I would consider using the cap.

Grey
  Reply With Quote
Old 10th May 2002, 01:32 AM   #4
diyAudio Member
 
Join Date: Apr 2002
Location: Czech Republic
In some schematics Mr. Pass uses this convention: resistor values are given as "three digit and multiplier", which means that 1000 in the schematic is a 100 ohm resistor, 1001=1k, 1002=10k and so on..
  Reply With Quote
Old 10th May 2002, 01:39 AM   #5
Warp Engineer
On Holiday
 
AudioFreak's Avatar
 
Join Date: Oct 2001
Location: Queensland, Australia
R19 = 56.2K
R21 = 1.5K
  Reply With Quote
Old 10th May 2002, 08:14 PM   #6
diyAudio Member
 
Karen's Avatar
 
Join Date: Sep 2001
Location: Foresthill, CA
Oops, Excuse me, 56.2K.
__________________
..K
  Reply With Quote
Old 10th May 2002, 08:32 PM   #7
The one and only
 
Nelson Pass's Avatar
 
Join Date: Mar 2001
You can dress her up, but you can't take her out
  Reply With Quote
Old 10th May 2002, 08:34 PM   #8
diyAudio Member
 
Karen's Avatar
 
Join Date: Sep 2001
Location: Foresthill, CA
I knew that one was coming. DUCK!
__________________
..K
  Reply With Quote
Old 10th May 2002, 08:35 PM   #9
Banned
 
Join Date: Feb 2002
Location: Dallas,Texas
Unhappy Karen

You leave that fine lady alone. She may be the only touch of class on this whole sorrid forum!

H.H.
  Reply With Quote
Old 10th May 2002, 08:38 PM   #10
diyAudio Member
 
Join Date: Feb 2001
Location: Columbia, SC
S'alright, dahlin', I'll take you out.
Given some of the disjointed nonsense I've been spouting recently, it's a wonder they haven't pulled the plug on me. Once I get a little sleep, maybe I'll be more coherent, myself.

Grey
  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
5 Watt Resistors on Aleph 4 and Holco Resistors nicharis Pass Labs 16 8th February 2012 08:50 AM
Esotar 330: Measured Science or Mystical Fiction? leifislive Multi-Way 24 26th June 2008 08:17 PM
Artist with the most mystical albums rick57 Music 32 10th April 2006 08:39 AM
Resistors in Aleph-X Hastur Pass Labs 8 7th February 2006 11:18 AM
Resistors in Aleph 2 diyman Pass Labs 1 4th May 2003 07:57 PM


New To Site? Need Help?

All times are GMT. The time now is 12:33 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