DIY Audio F4 Premium Resistors? - Page 2 - 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 9th November 2012, 12:34 PM   #11
Einric is offline Einric  United States
diyAudio Member
 
Einric's Avatar
 
Join Date: Feb 2011
Location: Bozeman, MT
Pre,

Which series of Caddock thick films are you speaking of?

Thanks
  Reply With Quote
Old 10th November 2012, 03:33 PM   #12
Einric is offline Einric  United States
diyAudio Member
 
Einric's Avatar
 
Join Date: Feb 2011
Location: Bozeman, MT
For the precision wirewound resistors I was looking at these Vishay MR106's for the 100Ω, 1kΩ & 10kΩ.
They are large at 1/4"x1/2" so there would only be a few that would even fit.
The 100Ω resistor looks like it's right at the 240 & 9240's, that is probably the only place where these would fit.
Are these high precision wirewound resistors really any better that a well matched metal film?
  Reply With Quote
Old 10th November 2012, 07:51 PM   #13
Einric is offline Einric  United States
diyAudio Member
 
Einric's Avatar
 
Join Date: Feb 2011
Location: Bozeman, MT
Mouser has a pretty good deal on the Vishay CMF resistors.
At 15cents each I can buy a pile of them and do some hand matching.
This would give me precision and low noise with 50ppm stability.

Win, Win, Win!
Attached Files
File Type: pdf Vishay CMF Resistor.pdf (171.7 KB, 18 views)
  Reply With Quote
Old 11th November 2012, 04:39 AM   #14
diyAudio Member
 
The Space Egg Corp's Avatar
 
Join Date: Sep 2010
Location: London & Miami
Blog Entries: 13
Hi Einric

There is of course nothing wrong with the 'vertical-mounting' of longer parts.

I don't think it's 'high-precision' we're talking about really.
The 5% Welwyns, actualy come out pretty darn close to stated value.
Matching, per position & per channel, isn't that hard...
...tiny bit of wastage maybe...
...but seeing as an F4 doesn't need a bucket-load of resistors anyhow, not TOO expensive.

I would buy 6 of the Welwyns; as opossed to 1 'precision' any day.

I think the issue of 'noise' here, is pretty much a 'non-issue'...
...in a phono-stage, yes...an F4 ? Mmmm...well not nearly so...by a country-mile.

I think the issue of Metal-Film Vs. Wire-Wound...
...is more one of 'subjective-tone' , or something like that !
( audiophile-adjectives, NOT a speciality ! )

Why does a valve 'sound' different to a transistor ?...
...or does it even ?
You should know, with your cool line-stage.

I think it all depends on the application...
( I just happen to be WW obsessed at present...
...maybe I'll get over it...
...maybe I won't...
...maybe they'll nail me in a pine-box, with all my de-soldered WW's ! )

Cheers

Si.

Einric...
...There's no such thing as WIN, WIN, WIN !

( we can try though !!! )
  Reply With Quote
Old 11th November 2012, 06:34 AM   #15
Einric is offline Einric  United States
diyAudio Member
 
Einric's Avatar
 
Join Date: Feb 2011
Location: Bozeman, MT
I will look at the .5W wirewound and see what may work.
I can also mount some of the resistors on the bottom of the boards to decrease population density.
  Reply With Quote
Old 12th November 2012, 01:26 AM   #16
diyAudio Member
 
The Space Egg Corp's Avatar
 
Join Date: Sep 2010
Location: London & Miami
Blog Entries: 13
Hi Einric

Smart move dude.
Lateral thinking ?
Don't see too many under-board solutions around here.
Perfectly valid, IMO.

Cheers

Si.
  Reply With Quote
Old 12th November 2012, 01:39 AM   #17
Einric is offline Einric  United States
diyAudio Member
 
Einric's Avatar
 
Join Date: Feb 2011
Location: Bozeman, MT
I mount under board all the time.
It helps to reduce clutter and put the ugly parts where you cant see them.
Attached Images
File Type: jpg 4780 Under.JPG (707.2 KB, 108 views)
File Type: jpg Bottom.JPG (936.6 KB, 107 views)
  Reply With Quote
Old 12th November 2012, 02:52 AM   #18
diyAudio Member
 
The Space Egg Corp's Avatar
 
Join Date: Sep 2010
Location: London & Miami
Blog Entries: 13
Hi Einric

Nice work on the Broskie !

Can you tell me anything about the red & round 'audiophiler' capacitors in the photo.
Did they come with a Broskie kit of parts ?
Or did you get them to use ?

Reason I ask is, I have seen this brand advertised, and am interested in them.

Cheers

Si.
  Reply With Quote
Old 12th November 2012, 04:49 AM   #19
Einric is offline Einric  United States
diyAudio Member
 
Einric's Avatar
 
Join Date: Feb 2011
Location: Bozeman, MT
They came with the kit along with the Wima's.
The Audiophilers are in the C4 position In parallel with C5 which is a Electrolytic.
C4 appears to be a bypass cap for C5.
  Reply With Quote
Old 12th November 2012, 12:14 PM   #20
diyAudio Member
 
The Space Egg Corp's Avatar
 
Join Date: Sep 2010
Location: London & Miami
Blog Entries: 13
Thanks Einric

I assumed for some reason, they were probably 'coupling caps'.

But seems not.
HT power-supply bypass instead.

I have the circuit schematic somewhere on the computer.
What are the 'red-Wima's' used for in the Broskie ?

I think, by the way, a valve 'front-end' (sort of) is a great move for a tranny amp.

What you listen to most Einric ?
CD, LP, tape, etc. etc.
Rock, Blues, Jazz, Classical, etc. etc.

Just wondered...

Cheers

Si.
  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
Audio quality of Spotify Premium and other streaming services? CopperTop PC Based 17 26th February 2013 10:45 AM
WTB: DIY F4 jdubs Swap Meet 0 7th October 2011 02:20 AM
F4 or F3 diy for sale to the cost José Humberto Swap Meet 2 1st May 2009 08:44 AM
Tymphany Corporation Premium Audio Video Division acquired by management tommak Multi-Way 1 8th January 2009 03:59 PM
FS: Audio Sector Premium LM3875 Kit Firebottle Swap Meet 2 23rd July 2006 07:46 AM


New To Site? Need Help?

All times are GMT. The time now is 01:00 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