AU-X1

[Willy6]

Here is the difference between the adjustable voltage transformer and the 100v transformer. View attachment 747286

 

[Ronito6]

Toroidal transformer part number 4002960 is multi-voltage.

Toroidal transformer part number 4002961 is an unchangeable 100V Japan only toroidal.

That's good info for the knowledge base.

 

[Willy6]

I found a few resistors that are out of specs and the manual says they're 1/2 watt problem is I can't seem to find any 1/2 watt resistors?At mouser they're all coming up as 1 watt for the ones I need

 

[Hyperion]

Post the values you need, I'll post Mouser links for the correct ones.

 

[Willy6]

Post the values you need, I'll post Mouser links for the correct ones.

It'll be a few days but will do thanks

 

[Hyperion]

Pick from this link, get them from one series for preference Vishay or Xicon would be my first choice, but any will do.

http://www.mouser.co.uk/Passive-Com...Resistors/_/N-7h7zb?P=1z0wj7tZ1yzbppyZ1z0wljo

 

[Ronito6]

Factory modifications are not noted in the SM we all use for the X1.

Heck...The SM shows the buffer amp festooned with components that are not there after (what I'm guessing was) the very first X1's off the line.

Many resistor values were changed during the X1's run.

Go by the marking on the resistors and not by the SM.

You don't want to undo a factory change after all.

 

[Willy6]

I'm getting swamped with overtime at work seems like everyone's going on vacation it's gonna be slow going for awhile but thanks for your input guys.

 

[Hyperion]

Ok take your time - above all don't work on it when you are tired from working... in my experience that's when mistakes are made.

 

[Willy6]

Ok take your time - above all don't work on it when you are tired from working... in my experience that's when mistakes are made.

Is it OK to put a 1/4 watt resistor in place of a 1/3 watt one or would you bump it iup to a 1/2 watt?

 

[Hyperion]

That should be fine, resistors should never be run that close to their rating so that 0.08 watt or 1/12 of a watt makes a difference.

 

[Willy6]

That should be fine, resistors should never be run that close to their rating so that 0.08 watt makes a difference.

I noticed in the manual most of them were 1/3 watts so I'll use 1/4 watts instead

 

[Willy6]

Factory modifications are not noted in the SM we all use for the X1.

Heck...The SM shows the buffer amp festooned with components that are not there after (what I'm guessing was) the very first X1's off the line.

Many resistor values were changed during the X1's run.

Go by the marking on the resistors and not by the SM.

You don't want to undo a factory change after all.

I measure them with my dmm and then check the color code first and then look at the service manual and so far they're all the same listed in the manual

 

[Willy6]

I measure them with my dmm and then check the color code first and then look at the service manual and so far they're all the same listed in the manual

I had some time last night so I pulled f-2775 out and checked the out puts and all three of the 2SC2493N's are shorted.I do have a bunch of MJ21194G -93G's available but was wondering about what the best replacement's would be?

 

[Hyperion]

That's a shame - the MJ's will definitely work, but may not allow the amplifier to shine quite as brightly 'audio wise' as with the original transistors. If you take a look at the AU-X11 thread, he came up with a solution for different packaged transistors (of a more appropriate spec), which was quite elegant.

 

[Willy6]

That's a shame - the MJ's will definitely work, but may not allow the amplifier to shine quite as brightly 'audio wise' as with the original transistors. If you take a look at the AU-X11 thread, he came up with a solution for different packaged transistors (of a more appropriate spec), which was quite elegant.

Ya I saw that but do I need the same ones he used?

 

[Hyperion]

Not sure, what were the originals in his 'X11' ?

 

[AUD101]

If looking for similar replacements for the original o/p transistors - search a certain auction site for: Sanken Transistors LP200 – LN200 -

 

[Hyperion]

If looking for similar replacements for the original o/p transistors - search a certain auction site for: Sanken Transistors LP200 – LN200 -

Well, that's fine but only one pair, we need 3.... BTW: the seller's reputation is beyond reproach - AK's own 'Kale'.

 

[Willy6]

Another thing I found on the f-2775 is on one of them they had 91pf black flags and on the other board they had 47pf black flags in the same spots.