Does anyone have VT150 schematic? - diyAudio
Go Back   Home > Forums > Amplifiers > Tubes / Valves

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

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 30th January 2007, 03:26 PM   #1
diyAudio Member
 
Join Date: Mar 2006
Location: sdf
Default Does anyone has VT150 Schematic ?

Does anyone has the Audio Research VT150 Schematic ?

is it using only 2x6550 ?

cal
__________________
be tube
  Reply With Quote
Old 30th January 2007, 03:55 PM   #2
Zibi is offline Zibi  Poland
diyAudio Member
 
Join Date: Jan 2006
Location: Bialystok
http://www.arcdb.ws/VT150/VT150.html
  Reply With Quote
Old 30th January 2007, 08:18 PM   #3
diyAudio Member
 
Join Date: Jun 2005
Location: Norway
Looks like 4 x 6550 output tubes per channel, plus 2 x 6550 for the power supply.
  Reply With Quote
Old 30th January 2007, 09:35 PM   #4
Zibi is offline Zibi  Poland
diyAudio Member
 
Join Date: Jan 2006
Location: Bialystok
Exactly.
  Reply With Quote
Old 29th September 2010, 02:32 AM   #5
diyAudio Member
 
Join Date: Apr 2005
Location: boulder co
Default audio research VT150 schematic

hello, I need a schematic for a model VT150SE--can anyone help?

regards, paul crankbite@aol.com
  Reply With Quote
Old 29th September 2010, 06:07 AM   #6
diyAudio Member
 
lazzer408's Avatar
 
Join Date: Sep 2010
Location: Chicago
VT130 (getting close)

http://www.mcmlv.org/Archive/HiFi/AR-VT130.pdf

http://www.arcdb.ws/VT130/VT130.html

Last edited by lazzer408; 29th September 2010 at 06:12 AM.
  Reply With Quote
Old 29th September 2010, 09:30 PM   #7
diyAudio Member
 
Join Date: Apr 2005
Location: boulder co
Angry VT 150 schematic (Audio Research)

thanks for the VT 130 schematic--it does help a lot too, but the VT 150 has a different fully balanced driver comprising 4-12BH7 and plus and minus 360 volt DC power supplies.

I hope somebody out there has a VT 150 schematic to help me through this mess. (A cat napped on this nice warm amplilfier for a year until one day it quit due to a cat toilet event and I have had a hard time with it since then.) I have fixed 2 problems, but the DC drivers drift in a maddening way that a schematic would help with.

any tips appreciated---regards, paul
  Reply With Quote
Old 30th September 2010, 12:08 AM   #8
diyAudio Member
 
lazzer408's Avatar
 
Join Date: Sep 2010
Location: Chicago
What exactly is happening? Maybe we could help you track down the problem based on only a handfull of facts. Such as, what is controlling the "DC drivers"?? How does that device detect and adjust for "drift"?? Voltage feedback loop?? So there's a simple loop to work around. (Just an example) Check the tubes pin by pin and verify the voltages are with-in spec. Perhapse a tube's tolerances are drifting as its temperature rises. Worst case scenario you'll have to track it down without schematics. I've had to do that many many times but with success. It's time consuming but you'll get by with a little help from your friends.

I searched for that schematic with every resource I could and found nothing. Have you contacted AR to see if they could email it to you?

Is the drive circuit like this one? http://www.arcdb.ws/D79/ARC_D79_schematic.gif
  Reply With Quote
Old 30th September 2010, 01:22 AM   #9
diyAudio Member
 
Join Date: Apr 2005
Location: boulder co
It has 2 unmarked solid state TO 92 devices by each driver and the entire ampllifier is without any adjustments except for the bias for each 6550. I have only the one amplifier so I cannot check for unusual voltages. I suspect the TO 92 bias setting circuits but have no idea what goes on there. Audio Research was unfriendy and wanted to service it themselves.
  Reply With Quote
Old 30th September 2010, 02:59 AM   #10
diyAudio Member
 
HollowState's Avatar
 
Join Date: Aug 2006
Location: Taxland, New Jersey
Quote:
Originally Posted by wallruss View Post
(A cat napped on this nice warm amplilfier for a year until one day it quit due to a cat toilet event and I have had a hard time with it since then.) I have fixed 2 problems, but the DC drivers drift in a maddening way that a schematic would help with.
If you haven't already done so, the circuit board and other internal areas that were contaminated need to be thoroughly cleaned. Urine is pretty conductive and corrosive. I would remove the board (if at all possible and making notes of all the wire connections) and wash it with rubbing alcohol and a tooth brush. Pay particular attention to any integrated circuits and the space between the leads, as welll as transistors and any high meg resistors. 70% rubbing (isopropyl) alcohol will not hurt the board or any plastic parts. Rinse very well with clean or distilled water and dry thoroughly. A hair blow drier helps with drying.

I suspect the VT150 uses a DC balancing feedback arrangement much like the VT130 does in the output to driver stage. Any contamination in this area would cause unstable drifting. I think a good thorough cleaning may solve your problem. I'm also a little surprised that AR refused a diagram. They usually will if you own their product. Maybe ask again and promise not to share it.
__________________
"It is hard to imagine a more stupid or more dangerous way of making decisions than by putting those decisions in the hands of people who pay no price for being wrong." ~Thomas Sowell
  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
looking for a pre-amp schematic steamPunk Tubes / Valves 3 3rd August 2008 01:49 PM
DBX 500 schematic d3imlay Solid State 0 2nd August 2008 05:12 PM
F3 schematic kenev Pass Labs 2 24th January 2008 03:24 PM
What do you think about this schematic? DaveWeckl Solid State 4 15th February 2004 10:32 PM


New To Site? Need Help?

All times are GMT. The time now is 03:10 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