Valve Itch phono - Page 57 - diyAudio
Go Back   Home > Forums > Source & Line > Analogue Source

Analogue Source Turntables, Tonearms, Cartridges, Phono Stages, Tuners, Tape Recorders, etc.

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 12th December 2011, 10:47 PM   #561
Salas is offline Salas  Greece
diyAudio Chief Moderator
 
Salas's Avatar
 
Join Date: Oct 2002
Location: Athens-Greece
Not needing resistor specials, just to be alike quality, so there are no other question marks. When SUTs are involved its good to play with secondary load, in some it will be more pronounced in others not, depending on the particular phono also, is a general conclusion.
  Reply With Quote
Old 12th December 2011, 10:53 PM   #562
diyAudio Member
 
Join Date: Jan 2006
Location: Ireland
Overall - I think its worth experimenting with this resistor - probably after you have tried and settled on the RIAA and interstage caps - it does make a difference alright, and is worth doing. I suppose if you have the equipment to tune it on a scope, then its worth doing it that way.

My ears say that subjectively it sounds "cleaner" without losing warmth, presence or any of the good stuff. Just listening to Tom Waits - Small Change here now and the walking bass line is just great, and the vocals are very clean and clear and natural sounding. Not that it wasn't before!!!

Great album BTW, worth picking up the new vinyl release if you see it...

Click the image to open in full size.
  Reply With Quote
Old 13th December 2011, 12:28 PM   #563
diyAudio Member
 
merlin el mago's Avatar
 
Join Date: Sep 2009
Location: Catalonia - Europe
Quote:
Originally Posted by woodturner-fran View Post
So I replaced the 47k with 22k and have been listening for the last half an hour or so. Little enough change, perhaps a little more clean sounding, but not huge......

Fran
Quote:
Originally Posted by Salas View Post
It did bring up HF for 47K VS 18-22K on scope and FFT, but it could be damping better on Itch's input and makes small difference. Still a little more cleaner is enough to keep it there. Is the new resistor quality the same as when it was 47K terminated?
Hey guys,

I'm not changing the 18-22K for the 47K load resistor in the Puresound MM, I'm adding the 18-22K between the SUT & the Puresound MM with it's own 47k load resistor, I'm doing wrong?

I prefer 18K shinkoh vs 22K Vishay VSH1, Vishay more clear in highs but less mids and lows, shinkoh is more balanced.
  Reply With Quote
Old 13th December 2011, 12:42 PM   #564
Salas is offline Salas  Greece
diyAudio Chief Moderator
 
Salas's Avatar
 
Join Date: Oct 2002
Location: Athens-Greece
That way you go parallel so you end up with ~15K with 22K extra. Either take out the 47K on Puresound and put the 18K there only, or leave it there and put 33K on the SUT's secondary.
  Reply With Quote
Old 13th December 2011, 12:56 PM   #565
diyAudio Member
 
merlin el mago's Avatar
 
Join Date: Sep 2009
Location: Catalonia - Europe
Default 1% RIAA caps GB

Quote:
Originally Posted by woodturner-fran View Post
Felipe: looks like after christmas maybe?


***************************************
I intend doing the resistor on mine later tonight - butI need to have a good detailed listen before I do the swap.

Just in case I'm confused here, or for others coming along after, you do mean changing R1 (47k) for something in the range of 18-22K?

Might be worth updating the sch or maybe the parts list to show the change....


Fran
I'm very angry, I don't know if after Christmas we will got the caps.

Felipe
  Reply With Quote
Old 13th December 2011, 12:59 PM   #566
diyAudio Member
 
merlin el mago's Avatar
 
Join Date: Sep 2009
Location: Catalonia - Europe
Quote:
Originally Posted by woodturner-fran View Post
Felipe: looks like after christmas maybe?


***************************************
I intend doing the resistor on mine later tonight - butI need to have a good detailed listen before I do the swap.

Just in case I'm confused here, or for others coming along after, you do mean changing R1 (47k) for something in the range of 18-22K?

Might be worth updating the sch or maybe the parts list to show the change....


Fran
Quote:
Originally Posted by Salas View Post
That way you go parallel so you end up with ~15K with 22K extra. Either take out the 47K on Puresound and put the 18K there only, or leave it there and put 33K on the SUT's secondary.
I will put 33K on the SUT's secondary.
  Reply With Quote
Old 13th December 2011, 03:20 PM   #567
diyAudio Member
 
merlin el mago's Avatar
 
Join Date: Sep 2009
Location: Catalonia - Europe
BIG IMPROVEMENT:ch eerful:: up:
  Reply With Quote
Old 13th December 2011, 05:54 PM   #568
Salas is offline Salas  Greece
diyAudio Chief Moderator
 
Salas's Avatar
 
Join Date: Oct 2002
Location: Athens-Greece
So, more pronounced in your case than in Fran's. Details?
  Reply With Quote
Old 13th December 2011, 06:50 PM   #569
diyAudio Member
 
merlin el mago's Avatar
 
Join Date: Sep 2009
Location: Catalonia - Europe
It's like more energy arriving to the Puresound MM, more transparency, fast attack, less noise, it sounds very very close to Simplistic NJFET RIAA.
  Reply With Quote
Old 2nd January 2012, 09:25 PM   #570
diyAudio Member
 
Join Date: Jan 2006
Location: Ireland
I've finally left mine at 18k - I think it's given it a tad more clarity - but also less forgiving too.......

Anyway, I'm going to leave it there for a while now and live with it..... I think there is an element of tuning going on, slightly different loading suiting different systems.

Fran
  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
Got the build itch again. 80w kt88 itsmejto Tubes / Valves 44 26th September 2008 11:49 PM
valve phono stage wanted for mc brobarrie Swap Meet 1 13th August 2007 08:17 PM
Basic DIY Valve Phono Stage matthew2456 Tubes / Valves 5 29th March 2007 04:11 AM
Phono pre, valve or jfet lndm Analogue Source 7 4th April 2006 02:11 PM
phono preamp design for c3m postie valve fergs1 Tubes / Valves 1 29th May 2005 02:12 PM


New To Site? Need Help?

All times are GMT. The time now is 04:23 AM.


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