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Old 17th March 2007, 06:53 PM   #11
arvin is offline arvin  United Kingdom
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Cheers Guys my x10d is version one.
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Old 18th March 2007, 11:56 AM   #12
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Be careful when tube rolling with the X series. I had the X10D and tried some Mullard ECC88's. Sounded very treacly, I liked the stock much better.

The power supply would seem to be the best upgrade. Cap changes might also help. Remember this is a tuned circuit so indescriminate swapping of components may not give you the result you are expecting.

Shoog
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Old 18th March 2007, 03:09 PM   #13
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Default Re: About X10D Mods

Quote:
Originally posted by Ciu
To andrew_whitham

Wich resistor I have to change to modify the gain ; I see a 470k // Cap 10µ, and at the other side, near V1 Cathode, another resistor 1.5K // 220pF ?
To go Up, or to go down in values ?

Thanks !
R.C.
Well Ok now, I am NOOOoooo expert in feedback (or much else really) but, so I can be corrected by someone is, the 10uF cap is passing most of the audio band so I'd direct my attention to the 1.5k resistor and reduce it BUT it is part of a step network, so....

Actually I'd pull out the 10µ cap, altogether first, and try not frequency dependant feedback. The problem is that When Messing around with someone elses circuit its not immediately obvious what the design intent was. (or maybe it is, I dont know)

Beware though, the board on my X10D is er, 'not healthy' I get the idea that they arent the most de-solder friendly bits of kit.
In my defence, I got it like that. (although you can buy a copy of the board on ebay for a few dollars)

Shoog: tube rolling in the x-series, its healthy exercise.
The Mullard E88CC was the one I preferred! I guess it must just suit my system - or my ears. I found the stock really thin in comparison. Same for the X-cans. Not that the tube is supposed to make any difference under this much FB... but anyway.

Andy
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Old 18th March 2007, 03:26 PM   #14
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Default Re: Re: About X10D Mods

Quote:
Originally posted by andrew_whitham
so I'd direct my attention to the 1.5k resistor and reduce it BUT it is part of a step network, so....

Andy
Hi Andy

Are you sure that is not a 15K resistor?

For a overall gain of ~4 ...
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Old 18th March 2007, 04:47 PM   #15
Ciu is offline Ciu  France
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Default About X10D

Hello !

May be the error is mine, because I have two schemes, differents !!!
One (one is noted 15k ), another (from Alex ZeusLab ?) is noted 1.5k
Where is the truth, I don't have the board near me...
The gain is given for 0.98 ... No ?

R.C.
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Old 18th March 2007, 06:16 PM   #16
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Default Re: About X10D

Quote:
Originally posted by Ciu

One (one is noted 15k ), another (from Alex ZeusLab ?) is noted 1.5k
Where is the truth, I don't have the board near me...
The gain is given for 0.98 ... No ?

R.C.
If the gain is given for 0,98 ( ~1) , then the resistor must be 1.5 K Ohms...

Salut...
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Old 18th March 2007, 10:45 PM   #17
Ciu is offline Ciu  France
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Default X10D Mods

Hello Tube_Dude !

How do you calculate the gain ?
Is only the 1.5k resistor to change ? The cap // also ?

I bought this to give some more level to the Monica DAC I built , but nothing to do with a buffer with unit gain, unless you would gave me a miraculous recipe to give a gain of 6 or more?
I understood the PSU should be changed, for a symetric -+30v, that is quite simple for me, but in the schematic, no idea !

Thanks for any advice
R.C.
PS : 900 kawa vintage 1975, your's ?
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Old 18th March 2007, 11:04 PM   #18
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Default Re: X10D Mods

Quote:
Originally posted by Ciu
Hello Tube_Dude !

How do you calculate the gain ?
Bon soir , Ciu

The gain is given by 1 + ( 1.5k/ 4.7K ), so in your case , you have a gain of ~ 1.3 .

For a gain of 6 you must change the 1.5 K resistor for 22 k.

Don't change the 4,7 K resistor , because it provide the DC bias condition of the input tube.

As the resistor is 5 times greater , the // capacitor must be ~ 5 times smaller for the same time constant...

Hope it help.




Quote:
PS : 900 kawa vintage 1975, your's ?
No , it's a 2003 Suzuki GSX 1400...

http://www.lerepairedesmotards.com/a...tergsx1400.htm

ال rule!!
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Old 18th March 2007, 11:23 PM   #19
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Here is the trace I did of an Issue 2 PCB.

C101, C102, C104 (and the equivalents from the other channel)were upgraded to polyproylene. C105 was upgraded . The unit was running 6AQ8 tubes.

Cheers,
Ian
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Old 18th March 2007, 11:28 PM   #20
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And here is the Power Supply schematic

I replaced all 35V rated electrolytics with 50V rated Sanyo and all 1N4007 diodes were replaced withn BYT11-800 Ultrafast Soft Recovery diodes.

CAUTION: Floating around the web are upgrade instructions for the X10D which include replacing TR1, TR2, TR3, TR4 with BC640. Note that two of the original transistors are BC327 (PNP) and 2 are BC337 (NPN). That "upgrade" would produce smoke.

Cheers,
Ian
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