X10 Pre

john65b · 26th May 2007, 07:13 PM

Hey all,

I have just read thru the following post of the Musical Fidelity X10D Pre/Tube Buffer

MF XPre troubleshooting

It looks interesting that its on a +/- 30VDC supply (and 6.2VAC Heaters)

Anyway, I was thinking of building one and have a newbee question:

For the +/-30VDC, I have a 21 - 0 - 21 Toroid that I was thinking of using with a Full Bridge Rectifier/10,000uf smoothing caps to get +/-30V rails.

For the Heater Voltages, I was planning on winding a new coil onto the 21-0-21 toroid to get the required 6.2VAC for the heaters (AC on heaters)

Any thoughts/comments on whether this is a good idea? The rest of the components look like they should be to difficult to get...my first tube pre, hence the lame-o question...

Thanks

Luke · 26th May 2007, 10:34 PM

Hi John,

I have owned one of these and IMO they are very ordinary. There are better projects out there

john65b · 27th May 2007, 01:44 AM

Thanks for the heads up...

But the concept of using a 21-0-21 80VA toroid is possible?

Do you know of another lower voltage (30 ish) simple tube preamp designs out there?

Again, I want to build it, not buy it.

Shoog · 27th May 2007, 08:03 AM

There is a low voltage version of the Aikido which uses ECC86's (a tube designed for low voltages - as opposed to the ECC88 which isn't).
I had a X10D and I liked it when I had medioca gear. The thing that I found was that it seemed to be optimised for the supplied tubes. I tried other tubes and didn't like the result.

I agree - you can do a lot better.

Shoog

26th May 2007, 07:13 PM	#1
john65b diyAudio Member Join Date: Jan 2005 Location: Chicago	X10 Pre Hey all, I have just read thru the following post of the Musical Fidelity X10D Pre/Tube Buffer MF XPre troubleshooting It looks interesting that its on a +/- 30VDC supply (and 6.2VAC Heaters) Anyway, I was thinking of building one and have a newbee question: For the +/-30VDC, I have a 21 - 0 - 21 Toroid that I was thinking of using with a Full Bridge Rectifier/10,000uf smoothing caps to get +/-30V rails. For the Heater Voltages, I was planning on winding a new coil onto the 21-0-21 toroid to get the required 6.2VAC for the heaters (AC on heaters) Any thoughts/comments on whether this is a good idea? The rest of the components look like they should be to difficult to get...my first tube pre, hence the lame-o question... Thanks

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26th May 2007, 10:34 PM	#2
Luke diyAudio Member Join Date: Sep 2001 Location: Wellington NZ	Hi John, I have owned one of these and IMO they are very ordinary. There are better projects out there

27th May 2007, 01:44 AM	#3
john65b diyAudio Member Join Date: Jan 2005 Location: Chicago	Thanks for the heads up... But the concept of using a 21-0-21 80VA toroid is possible? Do you know of another lower voltage (30 ish) simple tube preamp designs out there? Again, I want to build it, not buy it.

27th May 2007, 08:03 AM	#4
Shoog diyAudio Member Join Date: Aug 2002 Location: Eire	There is a low voltage version of the Aikido which uses ECC86's (a tube designed for low voltages - as opposed to the ECC88 which isn't). I had a X10D and I liked it when I had medioca gear. The thing that I found was that it seemed to be optimised for the supplied tubes. I tried other tubes and didn't like the result. I agree - you can do a lot better. Shoog

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