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best pre-amp for Pass F6
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Old 15th December 2016, 02:41 PM   #1
fabrice63 is offline fabrice63  France
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Default best pre-amp for Pass F6

Hi everyone,

I am looking for an nice great pre-amp to boost my Philips IS-5021 output , before my F6.


The DAC analog output is about 1 v rms , impedance is 200 ohms.


something simple , one in one out , dead quite , some noble stuff that some of you guy's know's about


Tanks in advance


Fabrice


.

Last edited by fabrice63; 22nd February 2017 at 11:46 AM.
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Old 15th December 2016, 02:58 PM   #2
vdi_nenna is offline vdi_nenna  United States
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best pre-amp for Pass F6 Send a message via Yahoo to vdi_nenna
Listed are some simple preamps. There are others, so look around.

I have used BOZ-J and B1 with the F6. BOZ-J has gain, 1 jfet in the path and 1 10uF cap in the output. B1 no gain.

BOZ-J has a little more in the way of bass support than the B1. The B1 is a little more transparent.

Also, there's a B1 rev2 that has no caps in the path.

B1- B1 Buffer Preamp

BOZ-J- see post 2. 10 ohm resistor should be 22 ohm with a 16v power supply, but 10 ohm will still work.
Jfet BOZ

B1 rev2 - see attached.

Vince
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Last edited by vdi_nenna; 15th December 2016 at 03:01 PM.
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Old 15th December 2016, 03:06 PM   #3
xrk971 is online now xrk971  United States
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best pre-amp for Pass F6
Best is a matter of debate and subjective. There are preamps that use 30+ actives per channel with exceedingly low distortion. But is that consistent with Pass Fx amp philosophy?

This one is very simple and just about every circuit from Juma works very well without fussing.

I just built this one and it sounds superb.

BF862 Preamp

Click the image to open in full size.

Click the image to open in full size.

Single ended class A with gain adjustable from 6dB to 17dB. Silent and super transparent.

Last edited by xrk971; 15th December 2016 at 03:09 PM.
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Old 15th December 2016, 03:29 PM   #4
vdi_nenna is offline vdi_nenna  United States
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What type of surface mount resistors are on your board?
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Old 15th December 2016, 03:56 PM   #5
xrk971 is online now xrk971  United States
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best pre-amp for Pass F6
0805 metal thin film 1% (maybe 5% but measure within 1%)

Last edited by xrk971; 15th December 2016 at 04:01 PM.
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Old 15th December 2016, 04:04 PM   #6
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Old 15th December 2016, 04:07 PM   #7
2 picoDumbs is online now 2 picoDumbs  Australia
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Quote:
Originally Posted by xrk971 View Post
Best is a matter of debate and subjective. There are preamps that use 30+ actives per channel with exceedingly low distortion. But is that consistent with Pass Fx amp philosophy?

This one is very simple and just about every circuit from Juma works very well without fussing.

I just built this one and it sounds superb.

BF862 Preamp

Click the image to open in full size.

Click the image to open in full size.

Single ended class A with gain adjustable from 6dB to 17dB. Silent and super transparent.
Yes that is a nice preamp.
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Old 15th December 2016, 04:46 PM   #8
fabrice63 is offline fabrice63  France
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The jeft-BOZ looks interesting, but where to find some genuine matched 2sk170 bl ??

I have some nice 14.8 v / 6 A lipo battery for it ;-)

.
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Old 15th December 2016, 05:20 PM   #9
fabrice63 is offline fabrice63  France
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is the LSK 170 from the store the same as the 2sk170bl ??

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Old 15th December 2016, 05:25 PM   #10
bk856er is offline bk856er  United States
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best pre-amp for Pass F6
Quote:
Originally Posted by fabrice63 View Post
The jeft-BOZ looks interesting, but where to find some genuine matched 2sk170 bl ??

I have some nice 14.8 v / 6 A lipo battery for it ;-)

.
Could try here?

BK
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