Pass Aleph P1.7 Help needed

fschlenk · 30th April 2005, 05:35 PM

Hi all,

i am currently building an Aleph p 1.7 clone.
PCB comes from http://web.vip.hr/pcb-design.vip/aleph-17.html

Test show that the amplification is not working properly:
With an input voltage of 450mV I get 1.05 V output max.
I tried all Input Switch Positions.
The 9610 are running very hot (85 degree C).
Does anyone who already built an Aleph P 1.7 have the voltages over Mosfeet and Bipolar Transistors and can send these value to me.

Any help is highly appreciated.

Thanks and All the best

acaudio · 30th April 2005, 05:45 PM

For first you should measure the voltage loss across the source resistors (22 respective 33 Ohm)
The voltage loss should be at aprox. 0,65V

Adam

jleaman · 30th April 2005, 06:55 PM

Remove the . from the end of your link .. : O )

http://web.vip.hr/pcb-design.vip/aleph-17.html

J'

fschlenk · 1st May 2005, 02:25 PM

Quote:

Originally posted by acaudio
For first you should measure the voltage loss across the source resistors (22 respective 33 Ohm)
The voltage loss should be at aprox. 0,65V

Adam

Hi acaudio,

the voltage across the source resistors is 0.62 and 0.66 V.
Any other ideas ?

Thanks

acaudio · 1st May 2005, 07:32 PM

Quote:

Originally posted by fschlenk

Hi acaudio,

the voltage across the source resistors is 0.62 and 0.66 V.
Any other ideas ?

Thanks

Hello,
which value of gain potentiometer has you used?
2K as in original?

Regards
Adam

fschlenk · 1st May 2005, 08:24 PM

Quote:

Originally posted by acaudio

Hello,
which value of gain potentiometer has you used?
2K as in original?

Regards
Adam

Hi Adam,

I tried with the 2k pot. But the amplication is not affected by the setting. Now I use 768R fixed.

Regards

aht · 2nd May 2005, 02:46 AM

Give me your PCb design or post it here.

I'll be compare & check PCB line. You may be get a wrong design of PCB.

Now I use AlephP1.7 ,too.

It's sound nice with Evox capacitor 12uF*8/63V.I'll be compare with Panasonic FC series soon.

If you want my PCB's design & bias test point can email me for send it.

Regard
AHT

kilowattski · 2nd May 2005, 10:56 AM

AHT,

He is using a proven PC board. If you read his first post you will see he is using a PC board designed by Kristijan Kljcaric of PCB-DESIGN. The boards have been used successfully by many members of this forum.

kilowattski · 2nd May 2005, 11:12 AM

fschlenk,

If you are using an attenuator or potentiometer on the output please disconnect it then remeasure the gain. Remember that the output is 1/2 if your are using the single ended input. If you are using single ended input remember to short the negative input to ground. Also remember that the internal attenuator switches need jumpers in position 1,2,7,8 and 3,4,5,6 should be open for zero dB input attenuation.

jh6you · 2nd May 2005, 11:17 AM

If the voltage measures about 0.60-0.7 accross R44/55/59/70 and about 30V at the drains of 9610s. Nothing is wrong.

Mayby Nesson Pass is wrong!!!

Regards

30th April 2005, 05:35 PM	#1
fschlenk diyAudio Member Join Date: Mar 2003 Location: nomadic	Pass Aleph P1.7 Help needed Hi all, i am currently building an Aleph p 1.7 clone. PCB comes from http://web.vip.hr/pcb-design.vip/aleph-17.html Test show that the amplification is not working properly: With an input voltage of 450mV I get 1.05 V output max. I tried all Input Switch Positions. The 9610 are running very hot (85 degree C). Does anyone who already built an Aleph P 1.7 have the voltages over Mosfeet and Bipolar Transistors and can send these value to me. Any help is highly appreciated. Thanks and All the best

2nd May 2005, 10:56 AM	#8
kilowattski diyAudio Member Join Date: Aug 2003 Location: Long Island, New York	AHT, He is using a proven PC board. If you read his first post you will see he is using a PC board designed by Kristijan Kljcaric of PCB-DESIGN. The boards have been used successfully by many members of this forum. __________________ ----------------------------------------------- Kilowattski

2nd May 2005, 11:12 AM	#9
kilowattski diyAudio Member Join Date: Aug 2003 Location: Long Island, New York	fschlenk, If you are using an attenuator or potentiometer on the output please disconnect it then remeasure the gain. Remember that the output is 1/2 if your are using the single ended input. If you are using single ended input remember to short the negative input to ground. Also remember that the internal attenuator switches need jumpers in position 1,2,7,8 and 3,4,5,6 should be open for zero dB input attenuation. __________________ ----------------------------------------------- Kilowattski

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30th April 2005, 05:45 PM	#2
acaudio diyAudio Member Join Date: Sep 2004 Location: Germany	For first you should measure the voltage loss across the source resistors (22 respective 33 Ohm) The voltage loss should be at aprox. 0,65V Adam

30th April 2005, 06:55 PM	#3
jleaman Banned Join Date: Apr 2002	Remove the . from the end of your link .. : O ) http://web.vip.hr/pcb-design.vip/aleph-17.html J'

2nd May 2005, 11:17 AM	#10
jh6you Account Disabled Join Date: Aug 2002 Location: Near to the Pacific Ocean	If the voltage measures about 0.60-0.7 accross R44/55/59/70 and about 30V at the drains of 9610s. Nothing is wrong. Mayby Nesson Pass is wrong!!! Regards

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