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Old 25th September 2008, 02:04 AM   #111
Salas is offline Salas  Greece
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Old 25th September 2008, 07:01 AM   #112
Werner is offline Werner  Europe
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"I don't recommend ''pacific style'' RIAA stages like this one for MM, because of the 300-400pF input capacitance"

Easy to cascode the input FET, if you don't need all that gain.
You can even make a folded cascode there, as I indicated on this site a couple of years ago.

BTW, the series dropper resistor and capacitor combos in each FET's supply can be used to tune the sound. I played such games with Pacific-style circuits 8 or 9 years ago.
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Old 25th September 2008, 07:23 AM   #113
Salas is offline Salas  Greece
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True, it can be cascoded, SRPP etc, but it won't be a Pacific class circuit anymore, strictly speaking. But it can be done for MM use, no doubt.
I have listened to the combination of the values and parts quality carefully against the Steve Bench cascoded double12AY7 & ECC88 stage with a Dyna DV6Z silver step up cylinder included under the bonnet. Tried to strike the most natural balance between 3 different output level MC carts and to follow the tube tone. As it can be seen in the photo, there are Soviet Silver Mica caps bypassing Siemens MKP in RIAA, Soviet Polystyrene coupling to the second stage, Mundorf Silver/Oil output coupler, Kiwame for Rd, Rs//trimmer, RIAA & RC filt. Dale // Kiwame for RLoad. Electrolytics are Panasonic TSW for first stage local bypass, Elna For Audio 2nd stage bypass, PSU RC filter and adj 317 bypass, out. UF4007 diodes.
If someone wants to just copy all the details, rest assured, its a valid mix as you see it. Of course, tastes and systems may vary wildly. Judge on your own.
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Old 25th September 2008, 07:29 AM   #114
Werner is offline Werner  Europe
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"True, it can be cascoded, SRPP etc, but it won't be a Pacific class circuit anymore"

Forget about SRPP. With a straight cascode it definitely would still be a Pacific. Well, at least in my book.
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Old 25th September 2008, 07:33 AM   #115
Salas is offline Salas  Greece
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No problem for me too, it would not bother me. But some would think...hey, look 3 JFETs instead of 2. Bad, bad. There is a bright side for MM users as it is though. They can use Grado!
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Old 25th September 2008, 08:27 AM   #116
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Salas

GREAT WORK !
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Old 25th September 2008, 08:15 PM   #117
Salas is offline Salas  Greece
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Thanks! Waiting to see your construction with Miniregs, your choice of components, etc. and learn your sonic experience and comparison to the original Pacific soon!
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Old 25th September 2008, 08:41 PM   #118
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I will do Salas but some delay as my TT arrived with supex901 2mv ,good cartridge to play some time.....

In the meantime a study for new cartridge ,dynavector 10x5 is in my short list (2,5mv)...what is very crazy is on dl103 after I read all WWW in 4 full day 50% like 50% dislike !!!!!!!!!!

the last is zxy bloom but too much money after TT
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Old 25th September 2008, 08:50 PM   #119
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As component

siemens polystyrene for riaa

mundorf supreme for 100nf and Cx

resistor vishay nude,caddoc ,riken, AB

Ska minireg

dual mono config

good toroid with screnn

4 ofc rca

fast diode

2 10000mf mundor
2-3 shipping cost in the end 150-200 ! before I need to choose cartridge... output......
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Old 25th September 2008, 09:08 PM   #120
Salas is offline Salas  Greece
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Aha, with such excellent parts you are the one to build the Salas ultimate...
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