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Old 1st October 2010, 04:44 AM   #5051
le´flu is offline le´flu  Germany
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Join Date: Mar 2004
Location: Hoexter
Hi Salas,
just to let you know, everything´s on its way.
All BC´s and 170´s well matched, for PSU i have Dale and MOX resistors at hand,
takmans for the RIAA circuit are ordered and on their way.
Lytics are Panasonic FM, RIAA-Caps are Polystyrene plus mica-finetuning.
Will go for EI-Core plus Rectification in an external Housing and double PSU and
Circuit in main box.
Until res. arrive, ´m thinking about grounding and positioning parts on tagboard.

What do you think?

Thanks and pictures will follow at the time...

Thanks and Greetings Ulf

Last edited by le´flu; 1st October 2010 at 04:47 AM.
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Old 1st October 2010, 07:02 AM   #5052
Salas is offline Salas  Greece
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I have to say your choices are decent, take care of the quality of your interstage coupling caps and to a lesser extent of your output caps, and wishing happy building.
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Old 1st October 2010, 12:15 PM   #5053
le´flu is offline le´flu  Germany
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Hi Salas,
yes components testing is quite awful ;-) we´ll see.
Just two more questions....
what´s the current, the CCS draws? Because i´ll take
36VAc Transformer and want to calculate the voltage-
dropresistor after rectification.
Second: What resistance do you recommend for testing
the PSU if ´ll take double (stereo) PSU?

Okay, allow one more question...whats your favorite
cap-combo?

Greetings Ulf
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Old 1st October 2010, 03:32 PM   #5054
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Quote:
Originally Posted by The Space Egg Corp View Post
Hi Felipe

Nice looking board.
How's the tuning going ?
Looks like you've got some fancy resistors in there.
I am wondering whether to splash some cash and do the same.
What are the 4 big space capsules that have landed in the middle ?
Thanks for the Thorens stuff again, haven't got the measurement yet.
Have also started looking at my Dual with a veiw to re-plinth and arm it.
I am afraid I might have got the diy tonearm bug from looking at the site too much !

Cheers Simon...
Hi Simon,

Thank you, the photo is my new balanced phono NJFET RIAA (four channels instead two channels) I'm waiting the teflon film & foil RIAA caps 15nF to do the final RIAA tuning.

Resistors are PRP metal film (red) Takman carbon film (pink) Kiwame (green) & Koa Speer & Xicon both carbon film (brown) I don't remember the name but are metal film (blue).

The trimmers are Bourns (4 small capsules blues near the gnd star screw)

About intestage cap: no doubt russian FT3 0.1uF 600V +-5 tolerance are my 1st choice (are the 4 big space capsules), for RIAA best teflon film & foil or minimum silver mica, for output cap a very good combo with interstage russian teflons are Mundorf Paper In Oil Silver Gold Oil. The photo is showing russian teflons FT3 insterstage & Auricaps output.

Lytics are Nichicon Muse (black) & Elna Silmic II (brown).

It's very important to do a good TT setup: Arm alignement, VTF, VTA, etc.

Cheers, Felipe
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Old 1st October 2010, 08:34 PM   #5055
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Default Balanced NJFET Phono

Quote:
Originally Posted by merlin el mago View Post
Hi Simon,

Thank you, the photo is my new balanced phono NJFET RIAA (four channels instead two channels) I'm waiting the teflon film & foil RIAA caps 15nF to do the final RIAA tuning.

Resistors are PRP metal film (red) Takman carbon film (pink) Kiwame (green) & Koa Speer & Xicon both carbon film (brown) I don't remember the name but are metal film (blue).

The trimmers are Bourns (4 small capsules blues near the gnd star screw)

About intestage cap: no doubt russian FT3 0.1uF 600V +-5 tolerance are my 1st choice (are the 4 big space capsules), for RIAA best teflon film & foil or minimum silver mica, for output cap a very good combo with interstage russian teflons are Mundorf Paper In Oil Silver Gold Oil. The photo is showing russian teflons FT3 insterstage & Auricaps output.

Lytics are Nichicon Muse (black) & Elna Silmic II (brown).

It's very important to do a good TT setup: Arm alignement, VTF, VTA, etc.

Cheers, Felipe
Hi Felipe

I guess DJ's would think your board rocks for 2x Technics (coolest club pre ever !!!).
But seriously Felipe, what are you connecting to, linestage? amp?
You must be using some kind of step-up balanced transformer?
Am interested in the way you will use it.

Cheers Simon...
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Old 1st October 2010, 10:28 PM   #5056
Salas is offline Salas  Greece
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Quote:
Originally Posted by le´flu View Post
Hi Salas,
yes components testing is quite awful ;-) we´ll see.
Just two more questions....
what´s the current, the CCS draws? Because i´ll take
36VAc Transformer and want to calculate the voltage-
dropresistor after rectification.
Second: What resistance do you recommend for testing
the PSU if ´ll take double (stereo) PSU?

Okay, allow one more question...whats your favorite
cap-combo?

Greetings Ulf
180-200mA with R1=10R 2W in the reg.

1K 5W test resistors.

Teflon interstage, PIO teflon bypassed out.
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Old 1st October 2010, 11:46 PM   #5057
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Hi Salas

Have now read all the 'valve itch' thread and today went right back to the start of this one to understand it's begining properly.
All very interesting stuff.

I originaly joined the site to be involved in a power amp build, and thought Nelson's BA-1 was what I would go for (the BA-1 thread seems to be as dead as a door-nail).

Since then I have been diverted away from this single aim to consider a much wider improvement to my whole system, and to try and come up with a whole integrated plan (even if this takes some time to implement, I quite like working on parallel projects as I think things move faster for me this way).

Verdict is still out on 'itch' vers 'JFET', but it's about 75% in favour of the JFET (I would love to do them both of course).

The question I wanted to ask you since your obviously a bit of a tube-head is, have you ever listened to a Mullard 5-10 amp and what do you think ?
The reason I'm interested is that it may resolve my phono decision.

Basicaly I've had a pair of Heathkit MA-12's for ages and never realised until now they were based on the 'classic' Mullard design.
I have never heard them at their best as they obviously need rebuilding, but if they were, would put some glass in my system even if I didn't build the 'itch'.

If you have any comments on the Mullard 5-10 / Heathkit MA-12, I would be interested to hear them.

Cheers Simon...
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Old 2nd October 2010, 03:53 AM   #5058
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Simon,
IMHO, I think you would be suprised at the performance and sound of the Jfets. They are the only "SS" amplification I have in my system. I considered tubes as well but am VERY happy that I choose this path. One day I may consider building a tube head amp but not for a while.

The Mullard 5-20 is a good sound amp. Not familiar with the 5-10's characteristics.
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Old 2nd October 2010, 10:11 AM   #5059
Salas is offline Salas  Greece
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Quote:
Originally Posted by The Space Egg Corp View Post
Hi Salas

Have now read all the 'valve itch' thread and today went right back to the start of this one to understand it's begining properly.
All very interesting stuff.

I originaly joined the site to be involved in a power amp build, and thought Nelson's BA-1 was what I would go for (the BA-1 thread seems to be as dead as a door-nail).

Since then I have been diverted away from this single aim to consider a much wider improvement to my whole system, and to try and come up with a whole integrated plan (even if this takes some time to implement, I quite like working on parallel projects as I think things move faster for me this way).

Verdict is still out on 'itch' vers 'JFET', but it's about 75% in favour of the JFET (I would love to do them both of course).

The question I wanted to ask you since your obviously a bit of a tube-head is, have you ever listened to a Mullard 5-10 amp and what do you think ?
The reason I'm interested is that it may resolve my phono decision.

Basicaly I've had a pair of Heathkit MA-12's for ages and never realised until now they were based on the 'classic' Mullard design.
I have never heard them at their best as they obviously need rebuilding, but if they were, would put some glass in my system even if I didn't build the 'itch'.

If you have any comments on the Mullard 5-10 / Heathkit MA-12, I would be interested to hear them.

Cheers Simon...
I haven't seen any Mullard original in the flesh or any Heathkit for that matter, but my amp I designed it around the classic Mullard topology and I like it enough for its output class. You can see the CCT and the ampo guy himself in the attachments, has some local design differences than a heritage amp of course, it also got some cap bypassed Leds instead of its main cathode resistor in its first stage lately. Scott knows about it, we have discussed about his next of kin topologically but more robust Opus amp in his power amp making thread.
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Old 2nd October 2010, 11:56 AM   #5060
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Quote:
Originally Posted by The Space Egg Corp View Post
Hi Felipe

I guess DJ's would think your board rocks for 2x Technics (coolest club pre ever !!!).
But seriously Felipe, what are you connecting to, linestage? amp?
You must be using some kind of step-up balanced transformer?
Am interested in the way you will use it.

Cheers Simon...
I connected to 2 stereo line amps Erno Borbely so true balanced linestage & final two mono amps also Erno Borbely 75W RMS Class A also balanceds.

Linestage & poweramps Borbely no transformers or caps on the signal way

Cheers, Felipe
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