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Old 16th May 2011, 01:37 AM   #21
Salas is offline Salas  Greece
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Quote:
Originally Posted by batty View Post
I have bought the remaining parts i needed and dug out an old 16V ac supply. I will need to build a bridge rectifier out of 4 of the diodes I have to get some DC to the 7809s. and a smoothing cap 4700 x 25v should do it.
Will surely do it. See its really 16VAC off your wall, if more, use 35V cap for longevity. See to use good quality proper value load resistor for the cart (evaluate a couple, don't follow the manual's minimum blindly), and VERY good quality 0.47uF coupling output cap. Will be happy to know if it worked for you well enough.

P.S.

That is what the specific post 7809 cap multiplier filter in your circuit is supposed to do for cleaning its DCin (LT SPICE sim).
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Old 17th May 2011, 11:39 AM   #22
batty is offline batty  Australia
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What resisrors and caps would you recommend trying?
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Old 17th May 2011, 12:16 PM   #23
Salas is offline Salas  Greece
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Zfoils & Teflon are best IMHO, next, Dale & Mundorf. Cheaper, Takman MF & Obbligato. Plain, Beyschlag and Russian K42y.
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Old 21st May 2011, 03:07 PM   #24
cjcc67 is offline cjcc67  Australia
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Hi salas,
Is the gain set by the value of R1? if I wanted to reduce the gain to 10 dB what would be a suitable value?
Thanks
Craig
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Old 21st May 2011, 03:33 PM   #25
Salas is offline Salas  Greece
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Av=-(gmRD) for no RS. About 32-35mS Yfs (gm) for each 7mA K170. Thus circa 50R with such IDSS fets. But don't run them over 8V across because extra noises creep up.
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Old 27th May 2011, 09:56 AM   #26
batty is offline batty  Australia
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I have kindly been given 2 Rifa 0.47uF caps for the output C3 part number PHE 241H made in Aus, I believe they are quite old but NOS. anyone heard of them? Any comments
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Old 29th May 2011, 12:54 PM   #27
ide2003 is offline ide2003  Indonesia
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hi batty, the transparent ones? I did tried for C1 (1uF) on aleph J, bit mushy to my taste but sweet. for my simplistic NJFET I use K73-16, 0.47uF
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Old 29th May 2011, 09:04 PM   #28
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I bought a set of 0.47uF ft-3 caps and some TX2575 resistors for Rload. Why is a 7809 used, most phono stages thrive on shunt supplies and being a MC-pre with it's tiny signals I thought a shunt is in the right place here. Guess I'm wrong here

- so no output swing, therefore no shunt needed, no gain here to use a Salas 1.1 ?

Regards, Erik
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Old 30th May 2011, 04:35 AM   #29
batty is offline batty  Australia
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hi batty, the transparent ones? I did tried for C1 (1uF) on aleph J, bit mushy to my taste but sweet. for my simplistic NJFET I use K73-16, 0.47uF
Yes transparent ones, but they have to be better than MKT
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Old 30th May 2011, 05:05 AM   #30
Salas is offline Salas  Greece
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Quote:
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I bought a set of 0.47uF ft-3 caps and some TX2575 resistors for Rload. Why is a 7809 used, most phono stages thrive on shunt supplies and being a MC-pre with it's tiny signals I thought a shunt is in the right place here. Guess I'm wrong here

- so no output swing, therefore no shunt needed, no gain here to use a Salas 1.1 ?

Regards, Erik
You can try whatever instead of the 7809 but leave the multiplier noise filter that comes after the 7809 there. That one defines the PSU Zo also. See not to have serious heat sources near the input JFETs.
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