Bias adjustment

Thank you. If I may be so bold as to ask what is a VHT bias?  And why does it have sockets? Don't I need only two leads from the meter to the bias connector [jack] on the amplifier? I'll check it out anyway. Any and all info will be greatly appreciated.

@ richfrank

I assume you still have the Cary SLI-80

See page 12. It appears all you need is a plug and of course a multimeter.
https://caryaudio.com/wp-content/uploads/2014/06/SLI-80_manual.pdf

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I got this cheap Woods multimeter at Lowes a few years back for my Cary SLI-80...now use it on my SLI-80HS.  Very simple and about $20.

https://mobileimages.lowes.com/product/converted/032886/032886958441.jpg?size=xl  

Thanks. I have a simple VOM also, but the CARY techs claimed that my bias setting was wrong and it burned out the KT-88. I know what I read on the VOM and it was reading 80 mA as it should be, but CARY kept insisting I had to send the amp back to them. I wouldn't buy a CARY PRODUCT again if my life depended on it. The techs are rude, sarcastic and think they know better than the client. Screw them!  And that's a FACT and you can post it if you want.

Sad but true. One of my first audio buds was a tech. Sharp as a whip, one glance inside anything and he could see what was going on and what to check and how to fix it or make it better. But all he did all day long was fix one simple thing after another (and to him they were almost always simple) and talk to one idiot incomprehensible and uncomprehending customer after another. It is apparently very hard to deal with morons all day long and then somehow flip around and assume this one here isn't just like all the other morons. 

Not saying he's right or wrong. Not saying you're a moron. Just saying it is what it is. 

If you want something really well made that works beautifully and where you will be talking with an intelligent and thoughtful human being in every interaction then you want to ditch Cary and talk to Keith Herron. Or for tube amps Raven Audio. In your situation I would totally go with Raven.