Valve Itch phono - Page 40

Salas · 5th August 2011, 12:39 AM

Quote:

Originally Posted by woodturner-fran

Power supply from earlier in the thread:

Itch circuit from earlier in the thread:

Fran

Naah, no good anymore, rather confusing on first look without had read, those come from different protos arrangements, lets revise up to what's adopted up to now and synchronize them schematics a bit.

webby · 5th August 2011, 10:37 AM

Hi all, Salas & Fran,
Very helpful indeed.

I will have a proper look over the weekend.
Just wanted to say a quick thanks!
Cheers
Ian

merlin el mago · 5th August 2011, 11:05 AM

Quote:

Originally Posted by Salas

Naah, no good anymore, rather confusing on first look without had read, those come from different protos arrangements, lets revise up to what's adopted up to now and synchronize them schematics a bit.

This is the last schematic?

RCruz · 5th August 2011, 11:09 AM

Quote:

Originally Posted by Salas

Naah, no good anymore, rather confusing on first look without had read, those come from different protos arrangements, lets revise up to what's adopted up to now and synchronize them schematics a bit.

Now we have all that is needed to build the Itch.

Thank you Salas and Fran.... Great work.

Salas · 5th August 2011, 12:21 PM

Quote:

Originally Posted by merlin el mago

This is the last schematic?

Those schematics have all final details, yes.

merlin el mago · 5th August 2011, 01:42 PM

Quote:

Originally Posted by Salas

Those schematics have all final details, yes.

woodturner-fran · 5th August 2011, 03:08 PM

Way back as I was starting my build, a member here, vgeorge sent me a matched pair of 15nF silver mica caps. I think they actually measured 15.3nF - some might argue that the difference will affect the RIAA, but personally I think there's a hundred other things that will affect the tonal balance of the phonostage first.

I have since used some K42Y-9 instead. To be honest, they sounded a little more "liquid" than the mica, which were just a bit brighter. But on a different system and cartridge, they might be just the ticket.

Anyway, first person to send me a PM looking for them can have them free, posted regular post. Don't forget to include your postal address.

Fran

woodturner-fran · 5th August 2011, 03:48 PM

Salas, I'm putting together a bill of materials from mouser etc for the parts. Would you mind going back and numbering the components on your schematics above?

Fran

Salas · 5th August 2011, 07:38 PM

Done. Medium ESR for C8,C9,C10,C11 on the PSU please.

woodturner-fran · 5th August 2011, 10:04 PM

Thanks,

working on it, will have it in a day or so.... it'll need checking by someone and most likely correcting too. I'm assembling it from my past mouser orders, so I may have bought say, 1% resistors for something else, and only 10% are needed here. Or maybe I listed all the 5W resistors in ascending price order and picked the cheapest at that time.... anyway you get the idea.

Fran

5th August 2011, 03:08 PM	#397
woodturner-fran diyAudio Member Join Date: Jan 2006 Location: Ireland	An Offer! Way back as I was starting my build, a member here, vgeorge sent me a matched pair of 15nF silver mica caps. I think they actually measured 15.3nF - some might argue that the difference will affect the RIAA, but personally I think there's a hundred other things that will affect the tonal balance of the phonostage first. I have since used some K42Y-9 instead. To be honest, they sounded a little more "liquid" than the mica, which were just a bit brighter. But on a different system and cartridge, they might be just the ticket. Anyway, first person to send me a PM looking for them can have them free, posted regular post. Don't forget to include your postal address. Fran

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5th August 2011, 10:37 AM	#392
webby diyAudio Member Join Date: Jul 2004 Location: england	Hi all, Salas & Fran, Very helpful indeed. I will have a proper look over the weekend. Just wanted to say a quick thanks! Cheers Ian

5th August 2011, 03:48 PM	#398
woodturner-fran diyAudio Member Join Date: Jan 2006 Location: Ireland	Salas, I'm putting together a bill of materials from mouser etc for the parts. Would you mind going back and numbering the components on your schematics above? Fran

5th August 2011, 07:38 PM	#399
Salas diyAudio Chief Moderator Join Date: Oct 2002 Location: Athens-Greece	Done. Medium ESR for C8,C9,C10,C11 on the PSU please.

5th August 2011, 10:04 PM	#400
woodturner-fran diyAudio Member Join Date: Jan 2006 Location: Ireland	Thanks, working on it, will have it in a day or so.... it'll need checking by someone and most likely correcting too. I'm assembling it from my past mouser orders, so I may have bought say, 1% resistors for something else, and only 10% are needed here. Or maybe I listed all the 5W resistors in ascending price order and picked the cheapest at that time.... anyway you get the idea. Fran