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

Tubes / Valves All about our sweet vacuum tubes :) Threads about Musical Instrument Amps of all kinds should be in the Instruments & Amps forum

Schematics for Xindak V30 Tube amp
Schematics for Xindak V30 Tube amp
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 14th September 2020, 07:56 AM   #1
goodfidelity is offline goodfidelity  Norway
diyAudio Member
 
Join Date: Jul 2020
Default Schematics for Xindak V30 Tube amp

I am looking for the schematics for this amp, i tried to google but just ended up in some shady websites that wants my credit card number.

Anoyone has the schematics for this i would be very happy!

I just bought one very cheap, and want to check BIAS on it, and also i am interested in adding preout (after volume controller, but before amplifier, so that it can be used another beefier amp for the low end)

Any input here is very appreciated!

Thanks
//GF
  Reply With Quote
Old 14th September 2020, 08:46 AM   #2
duncan2 is offline duncan2  United Kingdom
diyAudio Member
 
Join Date: Mar 2013
Location: Scotland.
stability of bias of KT88 in Xindak V30
An Eastern European website says -quote- "it uses an accredited classical design " that would make it easier if you checked out the many KT88 designs available at least in the UK .
  Reply With Quote
Old 14th September 2020, 03:28 PM   #3
audiowize is offline audiowize  United States
diyAudio Member
 
Join Date: Aug 2005
Location: Seattle
Schematics for Xindak V30 Tube amp Send a message via AIM to audiowize
A preout after the volume pot will have high output impedance and is rarely a good idea.

The circuit is very likely extremely close to the Eico HF-89.
  Reply With Quote
Old 14th September 2020, 04:34 PM   #4
duncan2 is offline duncan2  United Kingdom
diyAudio Member
 
Join Date: Mar 2013
Location: Scotland.
The KT88 / KT66 /6550 Directory
Scroll down by the KT88 data to various circuit diagrams using the KT88.
Of course it could be a copy of the world famous 1947 Williamson KT66 circuit as published in WW-
The Williamson Amplifier History.pdf
Again scroll down .
  Reply With Quote
Old 14th September 2020, 05:01 PM   #5
audiowize is offline audiowize  United States
diyAudio Member
 
Join Date: Aug 2005
Location: Seattle
Schematics for Xindak V30 Tube amp Send a message via AIM to audiowize
If you look at photos of the build of the V30, you can see half of each 12AX7 isn't used, and the coupling caps going to the output valves come off the plates of each half of the 6SN7. That kicks it out of the Williamson camp.
  Reply With Quote
Old 14th September 2020, 05:54 PM   #6
duncan2 is offline duncan2  United Kingdom
diyAudio Member
 
Join Date: Mar 2013
Location: Scotland.
And the photos showing this are where ?
  Reply With Quote
Old 14th September 2020, 06:15 PM   #7
HollowState is offline HollowState  United States
diyAudio Member
 
HollowState's Avatar
 
Join Date: Aug 2006
Location: Taxland, New Jersey
audiocostruzioni.com
Attached Images
File Type: jpg dentro.jpg (74.8 KB, 106 views)
File Type: jpg dentro xindak.jpg (61.3 KB, 107 views)
__________________
"At the heart of quantum mechanics is a rule that sometimes governs politicians or CEOs - as long as no one is watching, anything goes." ~ Lawrence Krauss
  Reply With Quote
Old 14th September 2020, 08:15 PM   #8
duncan2 is offline duncan2  United Kingdom
diyAudio Member
 
Join Date: Mar 2013
Location: Scotland.
The coupling capacitors go from the anodes of the Williamson to the grids of the output valves 6J5 to KT66 the 6J5 is just a single older version of a 6SN7 which is two 6J5,s in one glass .
Look up your tube equivalent book all specs are the same .


Yes it looks like one side of an ECC83 is not in the signal path.
  Reply With Quote
Old 14th September 2020, 08:25 PM   #9
goodfidelity is offline goodfidelity  Norway
diyAudio Member
 
Join Date: Jul 2020
Hello Guys, thanks for the info.

From the comments above it is difficult for me to derive if there is a possibility to hook up a pre out that is volume controlled from this V30 amp. I would be very happy to do so, as this might open up possibilitys to use another amp for the heavy work and use this amp for mids and highs, in a bi-amp configuration.

You guys have any suggestions as to where these pre-amp should be hooked up, or if there needs to be any other components added in order to reach this goal?

I found this amp at a very good price, and i am more then excited to find out what i can do with it.
  Reply With Quote
Old 16th September 2020, 04:38 PM   #10
goodfidelity is offline goodfidelity  Norway
diyAudio Member
 
Join Date: Jul 2020
Still nobody with insights as how to inch closer to having RCA IN/OUT pre amp?
  Reply With Quote

Reply


Schematics for Xindak V30 Tube ampHide 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
Xindak V30 tube upgrade from KT88 to KT120 chillysalsa Tubes / Valves 5 6th February 2018 06:09 PM
Xindak MT-3 branet Tubes / Valves 0 14th June 2012 04:55 PM
Xindak DAC-5 mods Cobra2 Digital Source 24 22nd July 2010 11:10 AM
Anyone know anything about Xindak? iampivot Digital Source 2 21st May 2008 05:11 PM


New To Site? Need Help?

All times are GMT. The time now is 01:13 PM.


Search Engine Optimisation provided by DragonByte SEO (Pro) - vBulletin Mods & Addons Copyright © 2020 DragonByte Technologies Ltd.
Resources saved on this page: MySQL 14.29%
vBulletin Optimisation provided by vB Optimise (Pro) - vBulletin Mods & Addons Copyright © 2020 DragonByte Technologies Ltd.
Copyright ©1999-2020 diyAudio
Wiki