Help please with my poorly Stasis 2

[TheFinisher]

If you do that make sure the bias pot is still at max resistance for start up - if you flip by mistake it it will be zero in the circuit - you don't want that. Also make sure the 2 heat sinks are clear of the OS. Also, Mikes amp is an S500 , not a Stasis 2.

To make your self 100% sure on the OS resistors, get the DMM on resistance range and measure each one as follows:

From the RF end you have marked - the pos side is on the left vertical row and neg on the right vertical row - there are 13 resistors on each side. Starting at the top end you have marked RF.

POS.
1R
1R
1R
1R
1R
10R
1R
1R5
1R
1R
1R
1R
1R

NEG.
1R
1R
1R
1R
1R
10R
1R
1R8
1R
1R
1R
1R
1R

Cheers mate, then I do have them fitted correctly
( I marked them all )

 

[TheFinisher]

Very nice! Good progress! 🙂

So if you can, it may make it easier to adjust the trim pots from the top if you place them on the side facing the capacitors. Side adjust pots are also key. These will get you started so that you can confirm that everything is smoke free.

In the pic below, the trim pots are facing down because the whole channel is upside down. When installed in the amp, the trim pots will face up. It is also helpful to use a fine tipped sharpie to put a "O" for offset and a "B" for bias.

View attachment 1274201

Side adjust pots ordered, thanks Mike

 

[TheFinisher]

I have sent you the top adjust trimpots Andy - to do what Mike has done you will need the side adjust trimpots - Bourns 3296X-1-501LF, so you can mount it so the adjust screw faces the top of the amp.

Pots ordered , cheers mate

 

[TheFinisher]

And today’s task ? The rats nest 😩

 

[gary s]

Wow, the inside is looking a lot cleaner now, you have done a good job cleaning it. Slow and steady wins the race when replacing and tidying up the wiring, check every wire with the wiring diagram point A to point B and so on.

Apart from the wiring mess, it is looking like a new amp almost.

 

[TheFinisher]

Now don’t all laugh at once ! I know the choice of cable colours is questionable but it’s what I have .
I think it’s a little tidier now though which is the whole point .

 

[TheFinisher]

Well after so much time given to this project by Gary i bought this locally today.
It would break my heart if I were to destroy the amp when powering it on , now I don’t have to worry.
Might come in handy if I decide to build a preamp later on.

 

[gary s]

That is great Andy and a surprise.

 

[TheFinisher]

Evening gents .
I need some advice please, Gary is currently away and without internet access and the new rectifiers that he advised me to fit have arrived but they’re different to the ones currently fitted.
The original ones have their polarity marked but the new ones don’t have any markings other than one corner is different, can someone please tell me how I connect them ?

 

[amplidude]

Corner is normally plus terminal, opposite minus others ac

 

[6L6]

Correct.
The twisted one is +
Diagonally opposite that is -

The others are AC

 

[TheFinisher]

Thanks gents ( I think I get it 😁)
I’ll be powering it up on Saturday, I’m only crapping it a little

 

[amplidude]

Would twisted wires not give a nicer finish, not to mention less hum

 

[amplidude]

Look forward to it, cross my fingers, but you're much safer now that you have a vario.

 

[TheFinisher]

I’m not worried about my safety! It’s the amp I’m worried about 😁

 

[TheFinisher]

Would twisted wires not give a nicer finish, not to mention less hum

I will twist them if that’s the case

 

[amplidude]

If you haven't read it here is a informative pdf on wirring an amp, I have used this pdf many times.

 

[TheFinisher]

Thanks mate, more rocket science to read .

 

[amplidude]

Its actually quite the opposite, I can say that because I understood most of it ...🙂

 

[TheFinisher]

Then I will take note but probably after/if I get the amp working.
I appreciate it 👍🏻