Go Back   Home > Forums > >
Home Forums Rules Articles diyAudio Store Blogs Gallery Wiki Register Donations FAQ Calendar Search Today's Posts Mark Forums Read

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

Valve Itch phono
Valve Itch phono
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 15th April 2011, 01:14 AM   #111
Salas is offline Salas  Greece
diyAudio Chief Moderator
 
Salas's Avatar
 
Join Date: Oct 2002
Location: Athens-Greece
Valve Itch phono
Since I haven't seen it working with stringed heaters, I can't speak from experience. Gibson had used them in parallel for one. I would prefer you don't mix stages heaters if possible for this kind of gain app.
Attached Images
File Type: gif 6N2PEVpins.gif (3.8 KB, 546 views)
  Reply With Quote
Old 15th April 2011, 01:27 AM   #112
woodturner-fran is offline woodturner-fran  Ireland
diyAudio Member
 
Join Date: Jan 2006
Location: Ireland
Sure - thats easy. I have some 15V transformers - which would suit ~12V heater supplies..... can use different secondaries for each, or even separate transformers. BTW, anyone looking for some - farnell still ahve some a ~€3 each!

Fran
  Reply With Quote
Old 15th April 2011, 01:33 AM   #113
Salas is offline Salas  Greece
diyAudio Chief Moderator
 
Salas's Avatar
 
Join Date: Oct 2002
Location: Athens-Greece
Valve Itch phono
You need two envelopes, one noval, one octal, at 1/2B+ elevated heaters for covering two channels in this phono. Another two the same at no elevation. Plan clear.
  Reply With Quote
Old 16th April 2011, 01:32 PM   #114
woodturner-fran is offline woodturner-fran  Ireland
diyAudio Member
 
Join Date: Jan 2006
Location: Ireland
Valves and bases ordered today. Traffos in stock - just need to organise the parts list next....
  Reply With Quote
Old 16th April 2011, 01:45 PM   #115
Salas is offline Salas  Greece
diyAudio Chief Moderator
 
Salas's Avatar
 
Join Date: Oct 2002
Location: Athens-Greece
Valve Itch phono
Lets see who does the first one. We have early British & Australian interest but Irish outsider late entry may steal the contest.
  Reply With Quote
Old 16th April 2011, 03:16 PM   #116
woodturner-fran is offline woodturner-fran  Ireland
diyAudio Member
 
Join Date: Jan 2006
Location: Ireland
Hah!! at the rate I'm going I really will be paddy last!

Anyway, giving back to community!!

BOM with mouser links.
PS info not included, wima caps chosen as reasonable base to start from, circuit numbered to match my own notes, prices are +vat.

Please double check!!!!


Fran
Attached Files
File Type: zip VALVE ITCH MOUSER BOM.xls.zip (6.2 KB, 125 views)

Last edited by woodturner-fran; 16th April 2011 at 03:18 PM.
  Reply With Quote
Old 16th April 2011, 04:04 PM   #117
Salas is offline Salas  Greece
diyAudio Chief Moderator
 
Salas's Avatar
 
Join Date: Oct 2002
Location: Athens-Greece
Valve Itch phono
Quote:
Originally Posted by woodturner-fran View Post
wima caps chosen as reasonable base to start from,

Fran
I would advise against the interstage coupling cap to be a Wima if possible. See for USSR K40Y PIO or 0.047uF K72P Teflon. Boutique PIO and Teflon no problem but can set back the budget heavily...
  Reply With Quote
Old 16th April 2011, 04:08 PM   #118
woodturner-fran is offline woodturner-fran  Ireland
diyAudio Member
 
Join Date: Jan 2006
Location: Ireland
Yes, I'd agree - i'll add a note to say that k40y will sound better....

Would you suggest the same for output cap and RIAA ones?

Last edited by woodturner-fran; 16th April 2011 at 04:16 PM.
  Reply With Quote
Old 16th April 2011, 04:42 PM   #119
Salas is offline Salas  Greece
diyAudio Chief Moderator
 
Salas's Avatar
 
Join Date: Oct 2002
Location: Athens-Greece
Valve Itch phono
For Riaa such caps lack in tolerance. For output I prefer 2u2 and to pre-shape the LF roll off with the interstage so it can mate many line inputs, still holding a determined rate fall. 47n to 100n interstage OK. 2u2 difficult in CCCP caps. Maybe K75-10 500B 1u//1u // FT3 0.1u. Green monstrosity with a silver accent.
  Reply With Quote
Old 16th April 2011, 07:40 PM   #120
woodturner-fran is offline woodturner-fran  Ireland
diyAudio Member
 
Join Date: Jan 2006
Location: Ireland
Yes, I've heard that before - but it might be worth buying a number and matching by hand.

Anyway, I've found a russian federation seller on ebay and will be ordering from him.....
  Reply With Quote

Reply


Valve Itch phonoHide 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

Forum Jump

Similar Threads
Thread Thread Starter Forum Replies Last Post
Got the build itch again. 80w kt88 itsmejto Tubes / Valves 44 27th September 2008 12:49 AM
valve phono stage wanted for mc brobarrie Swap Meet 1 13th August 2007 09:17 PM
Basic DIY Valve Phono Stage matthew2456 Tubes / Valves 5 29th March 2007 05:11 AM
Phono pre, valve or jfet lndm Analogue Source 7 4th April 2006 03:11 PM
phono preamp design for c3m postie valve fergs1 Tubes / Valves 1 29th May 2005 03:12 PM


New To Site? Need Help?

All times are GMT. The time now is 12:00 PM.


Search Engine Optimisation provided by DragonByte SEO (Pro) - vBulletin Mods & Addons Copyright © 2017 DragonByte Technologies Ltd.
Resources saved on this page: MySQL 15.79%
vBulletin Optimisation provided by vB Optimise (Pro) - vBulletin Mods & Addons Copyright © 2017 DragonByte Technologies Ltd.
Copyright ©1999-2017 diyAudio
Wiki