Anyone know how to bias output tubes (using built in meter) on a Stereo Knight M-40 (Int. Amp)?

Ok,Google turned up just enough info.I believe the 4 RCA's are so the passive preamp section can be isolated from the amp should you choose to use a different one.I think the problem is you must have a load on the amp to Bias.The single slot adjustment screws next to each power tube & the 1-4 switch should work together.First thing I would do is hook everything up & see if you get any sound.If your getting sound & the meter doesn't register it may be broken.Once you've confirmed the amp does work try the switch & bias pots,see what happens.Beautiful amp by the way.Good luck.

I wanted to elaborate on my findings re:the 4 RCA's on the side.First I am only about 70% sure that the info I found also applies to the S40 as it comes from the S.N.stand alone Reference PreAmp,which is the foundation of the PreAmp in the S40.Apparently when used as an Integrated Amp the S40 has an Active Class A PreAmp Stage.If I'm right the 4 RCA's are in to the Passive Stage of the PreAmp & out with just enough gain to drive the reference monoblocks they offered.Once you get the amp running you can test this theory.

Hi Freediver. A little reset here. The amp works great. The sound is absolutely amazing. I have several tube amps, but none with NO negative feedback...this thing really sings...it's ...in my world..unbelievable.  BUT...I don't know how to get the meter to engage.  The RCA's are not preamp out - power amp in.  They are four RCA's with open connectors.  No shorting straps. They are part of the biasing scheme, could be a short when applied, or maybe some resistance??? I believe the amp must of had some biasing fixture that plugged on the appropriate RCA of the tube you are biasing. 

I did do all the testing of the 1-4 switch, with the amp under load, but no input, and volume at 0.

The S40 is an active preamp (class A) feeding their KT88 tube output in what they call class A push-pull. (???) In my world, all push-pull is class AB by definition, but???? I can't argue with the sound of this amp. Just need to know how to keep it working.  I may have to buy a KT88 biasing socket.

Hi. I realize this thread is about 7 years, but it’s very relevant to me as I’ve just got the same amp (StereoKnight Lancelot S40)

Just as the thread starter, I’m not able to find any information about this integrated amp. Would really like to know a bit more about it, and also info conserning the bias system

So therefore I respond to this old thread. 

Hope someone has some info about it
 

(What a beauty of an amp this is 😊)