Audio Research VT 100 MKII need help!!

xmates · 5th July 2011, 03:14 PM

Hi guys,
I am now having a terrible problem, pls help me!
I changed the drive tube and when I was adjusting the bias of the diver tube to 10mVDC relative to each other at the two bias adjust point, A resistor blew up out with smoke. I don't know what kind It is and where to buy it. PLS help me!I can not take it to AR agent, because not available in my country from Asia. I just can buy it from somewhere out, ship to my home country and replace it then.Pls note that this resistor connect to a transitor(may be) with the heating free on it.
Mny tks to your help. ASAP pls! I am down with nervous! This í some pictures of it.

Zero Cool · 5th July 2011, 04:15 PM

you can contact Chris Ossana at Audio Research directly. contact information is on the website. he should be able to sell you the part directly plus give you service information.

Zc

analog_sa · 5th July 2011, 04:29 PM

Quote:

Originally Posted by xmates

I don't know what kind It is and where to buy it.

Hopefully you are not asking about the value

I think it's a Roederstein Resista MK8 2W. Possibly available from Michael Percy. Chances are the corresponding mosfets are also blown.

xmates · 5th July 2011, 04:30 PM

Tks Zero Cool,
I am not actually familiar with this. I could not find Chris Ossana email or phone on the audioresearch.com. Could you pls kindly get me his email on here?
Gratefully!

xmates · 5th July 2011, 04:39 PM

Quote:

Originally Posted by analog_sa

Hopefully you are not asking about the value

I think it's a Roederstein Resista MK8 2W. Possibly available from Michael Percy. Chances are the corresponding mosfets are also blown.

I totally do not know whether any part of my VT100 blown also or not. I just turn it of emmediately when the resistor burn out(like a tube

) with smoke. Do you have a estimate of its condition now? I just can see that the "black one" beside, relative to this resistor(I don't know what it is) seemed getting hot too.
Mny tks!

analog_sa · 5th July 2011, 05:35 PM

This repair is very simple for someone who knows what they are doing. Even if the unmarked mosfets are also blown. Getting tips from a forum is a lot riskier. I hate seeing nice equipment getting destroyed.

xmates · 5th July 2011, 05:49 PM

So, could you give me some reasons for this blow? Could it be new driver tube? I change the 6922 with used bugle boys that I think of improvement in sound quality. Or may be I adjusted the bias point too fast, or sth else?

Zero Cool · 5th July 2011, 06:10 PM

a shorted tube would most likley be the culprit. you may have other damaged parts now as well.

xmates · 6th July 2011, 03:52 AM

Quote:

Originally Posted by analog_sa

Hopefully you are not asking about the value

I think it's a Roederstein Resista MK8 2W. Possibly available from Michael Percy. Chances are the corresponding mosfets are also blown.

Hey Analog_sa,
Do you know about the value? I need that too.

analog_sa · 6th July 2011, 07:48 AM

If you have to ask, chances are you may cause some further damage. Do you solder well? Can't you get a good TV repairman to fix it for you?

5th July 2011, 03:14 PM	#1
xmates diyAudio Member Join Date: Jul 2011	Audio Research VT 100 MKII need help!! Hi guys, I am now having a terrible problem, pls help me! I changed the drive tube and when I was adjusting the bias of the diver tube to 10mVDC relative to each other at the two bias adjust point, A resistor blew up out with smoke. I don't know what kind It is and where to buy it. PLS help me!I can not take it to AR agent, because not available in my country from Asia. I just can buy it from somewhere out, ship to my home country and replace it then.Pls note that this resistor connect to a transitor(may be) with the heating free on it. Mny tks to your help. ASAP pls! I am down with nervous! This í some pictures of it.

5th July 2011, 04:15 PM	#2
Zero Cool Audio Junkie diyAudio Member Join Date: Sep 2004 Location: MN	you can contact Chris Ossana at Audio Research directly. contact information is on the website. he should be able to sell you the part directly plus give you service information. Zc __________________ It's not about what you can BUY...It's about what you can BUILD!

5th July 2011, 06:10 PM	#8
Zero Cool Audio Junkie diyAudio Member Join Date: Sep 2004 Location: MN	a shorted tube would most likley be the culprit. you may have other damaged parts now as well. __________________ It's not about what you can BUY...It's about what you can BUILD!

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5th July 2011, 04:30 PM	#4
xmates diyAudio Member Join Date: Jul 2011	Tks Zero Cool, I am not actually familiar with this. I could not find Chris Ossana email or phone on the audioresearch.com. Could you pls kindly get me his email on here? Gratefully!

5th July 2011, 05:35 PM	#6
analog_sa diyAudio Member Join Date: Aug 2002 Location: Sofia	This repair is very simple for someone who knows what they are doing. Even if the unmarked mosfets are also blown. Getting tips from a forum is a lot riskier. I hate seeing nice equipment getting destroyed.

5th July 2011, 05:49 PM	#7
xmates diyAudio Member Join Date: Jul 2011	So, could you give me some reasons for this blow? Could it be new driver tube? I change the 6922 with used bugle boys that I think of improvement in sound quality. Or may be I adjusted the bias point too fast, or sth else?

6th July 2011, 07:48 AM	#10
analog_sa diyAudio Member Join Date: Aug 2002 Location: Sofia	If you have to ask, chances are you may cause some further damage. Do you solder well? Can't you get a good TV repairman to fix it for you?

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