Pearl phono PCBs Group Buy

[promitheus]

I can get the ztx450, I have the 2sk389 and I will be matching my batch of 2sk170BL.
The Zener is no problem, the IRF9610 also no problem so that´s it.
were the 25 USD for one board or 2 boards?

I can offer the Panasonic caps like the ones used from Pass in the project the 10000uF/50V for 4,65 Euro each and the 3300uF/35V for 1,18 Euro each. Maybe a set for all the electrolytics would be a better idea.
Maybe 25 Euro for all the caps exept the 10uF MKP.

[steenoe]

were the 25 USD for one board or 2 boards?

That was for two boards.

Steen

[promitheus]

So after Calculating I could offer a Q Pack for 20 Euro.
2 Zeners
2 IRF9610
10 ZTX450
2 2sk389
2 quads of 2SK170BL

I could also organize a Cap Pack with all Caps for the PCB for 44,50 Euro not inlcuding the 10uF MKP.

Also an R Pack with all resistors using the MRS25 low noise Resistors from Vishay and the 2 2W resistors from panasonic for 8,50 Euro

The Heatsink costs 1,70 Euro and the 10 uF MKP Audyn Cap costs 3,70 Euro.

I can make a Price list to download for the prices of separate capacitors and other parts.

[promitheus]

Originally posted by transducer
Promitheus,

I know that you're organizing a Pearl group buy, but I think the Ono is a much better phono stage. If you decide to produce boards for the Ono, I would definately purchase a set (depending on the price, of course!).

Regards,
Ron

Have you compared the 2 phono stages. I can´t see why the Ono is a lot better than the Pearl. I would say the Pearl is a lot simpler and should be quieter with such a good power supply. It also costs less without the MC option. You can still use MM and high Output MC. If you want to use an MC than you can use a pre-pre with a transformer at the input.

[promitheus]

Buhl mentioned that the pre regulation also needs caps.
Looking at the schematic of the power supply I just saw that you can use a Mainsfilter on the primary side of the Transformer.

I will make a pcb for the power supply so if anybody has any ideas on how this would be best made please post.

I will also order more PCBs for the PSU but not so may as the Pearl ones because you would only one for every two Pearl boards.
Like I said: any ideas?

[Buhl]

Promitheus, I dint think that boards for the pre-regulated supply is that nescecary, the mainsfilter is easily mounted on the inputsocket / ICE or whatever, and the rest is easy done hardwired I think - just my two cents - but mabye others will be interested. I just get the impression, that it should be kinda crude made, and stuffed in a box away from the RIAA boards.

When you say cap-pack, does that also include the smallsignal caps in the riaa eq ? I think those should be wery high quality, as the are in the audio path, and also high tolerences are needed to keep the EQ within 1% - do you have any ideas, mabye the blue form viahay/reoderstein ??
If those also are included - arent we close to at complete kit (minus case and transformer ? - I personally think it is good, and mabye would appeal to the people who dont have the time/energy/possibility to collect all the bits and pieces for themselves - what do "the people" say about that ?? For me, time and energy isnt a problem, but availability of high quality bits and parts is troublesome, as we are a little country, with few DIY'ers - I suspect that those parts are easyer to get your hands on in germany.

Cheers
Hans

[promitheus]

The prices I calculated were for the Panasonic Polypropylene Caps from Panasonic like the ones Passdiy suggested. They are 2% but good quality.
I dont know what tolerances they have but there are better ones.
Silvered Mica are a very good choice but they would cost a lot more than the PCBs themselves.

[steenoe]

Panasonic Polypropylene Caps

They are great, you could match them between channels to get the best soundstage And the resistors in the RIAA network too, while you are at it

Steen.

[promitheus]

I can´t find any capacitors better as the Panasonic.
The Vishay seem better at 1% but I can´t find them anywhere available. Most have only a few different values and not the whole range.

Actually I could I have a lot of free time

Anyway. What still holds me back is that not so many people are interested.

I guess the Q Pack is needed. It´s not so easy to get those parts. I can do the whole work with precise matching even if it takes long.

I could I guess make a set for the RIAA parts that could be matched for both channels.

I see a problem in the schematic.
What´s wrong with C11 in the RIAA circuit?
The schematic says 0,15uF and the parts list says 15uF.

I think though that should be 150nF or 0,15uF.

[steenoe]

The schematic says 0,15uF and the parts list says 15uF.

I am confident that the sch. is right; C4, C6, C11 is 0.15uF

Steen.

Ps.

Actually I could I have a lot of free time

You are doing great, Promitheus! Some people will be thankfull, I think