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I need the correct way to bias new tubes in my ARC VT100MK111 AMP

First off I am not new to extreme high voltage as I have spent years around it and possess the necessary tools etc. This amp of mine has always and still play wonderfully. My thoughts are that after over twenty years it likely needs new output and driver tubes. So on that note here we go. From all that I have read one article states that I MUST have a CD player connected to the preamp inputs and on with nothing playing. Another article states that I MUST have my preamp connected to the preamp inputs and on but muted. Another article states that I MUST have my loud speakers connected to the outputs. Another article states that ALL ARC amps are designed so that they can be biased without anything connected to either the inputs or outputs of the amp. Now I fully understand the warm up procedure and the actual biasing procedure as to me it is very simple. My plan it to pay a bit more and buy the replacement tubes directly from ARC. So, can one of you guys / gals who without question knows the real answers please tell me what is the proper procedure? Thank you.

warren100
warren100 OP
5 posts
 

My only contact with ARC was to find out if they would sell me the replacement tubes. I did not ask them what should or should not be plugged into the amp during biasing. I was only looking for a price They quoted me a price of 2K. I think that I will look around for something a little less expensive if possible. I have the ARC instructions and have seen the above listed video. What I am unsure about is why there seems to be so many different individuals stating so many different ways of biasing that amp. Thank you.

acresverde
428 posts
 

If ARC themselves has posted a video dealing with the biasing of tubes for this specific amp then I think you can safely bypass all of the other "lore".

gkelly's avatar
gkelly
1,010 posts
 

if it ain’t possible to find a less expensive alternative. Then, when you revisit the purchase, would be a good time to bring up any issues you may have. it may even be worth the extra expense to get good advice. 

warren100 OP
5 posts
 

I will do that. Thank you.

ghdprentice's avatar
ghdprentice
9,435 posts
 

Audio Research does not sell the cheapest tubes, but they are the most thoroughly tested. I prefer when I can afford it to get them from ARC. I am absolutely sure I am getting the best tubes with the correct specs for my equipment and am supporting this great company. 

However, Upscale Audio assembles sets for ARC components. They are very reputable and reliable. I have also purchased from The Tube Store... but they are in Canada... I’d avoid cross country purchasing right now. 

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