Pass 250.5 oscillation? - Page 2

studeb · 22nd March 2010, 09:46 PM

Allen,

From the article the Zoebels are 100nF in series with 10 ohm, they are for high GBW (global bandwidth ?) solid state amplifiers.

Allen Wright · 22nd March 2010, 11:14 PM

Thanks again. My client will try this.

A Pass 250.5 should fit the description.

Regards, Allen

h_a · 23rd March 2010, 10:36 AM

The Zobel is mostly needed for bipolar output stages as these are sensitive to RF captured by the speaker leads. Can't remember a mosfet amp (as the PL are) with Zobel.

Have fun, Hannes

WithTarragon · 23rd March 2010, 02:38 PM

Quote:

Originally Posted by wayne325

.......
I was also thinking that if one was having difficulty with a product, one might
check with the mfr directly as a first go rather than airing it out in public as
a starting point.

Well said!

This is especially true since the designer is rather generous with his time and experience.

Allen Wright · 23rd March 2010, 03:40 PM

Quote:

Originally Posted by WithTarragon

Well said!

This is especially true since the designer is rather generous with his time and experience.

I don't have a connection for him, but Nelson was the first replier, but gave no advice then or since.

And I'm not claiming a faulty amp, just the combination of amp and my speaker cables.

Regards, Allen

Regards, Allen

Nelson Pass · 23rd March 2010, 07:59 PM

Actually I have given advice twice now.

It's OK with me if people bring up a service subject here, as
long as they don't use it to annoy me.

Allen Wright · 23rd March 2010, 11:02 PM

Nelson,
I never saw your second reply. Apologies.

Regards, Allen

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22nd March 2010, 09:46 PM	#11
studeb diyAudio Member Join Date: Feb 2008 Location: San Diego	Allen, From the article the Zoebels are 100nF in series with 10 ohm, they are for high GBW (global bandwidth ?) solid state amplifiers.

22nd March 2010, 11:14 PM	#12
Allen Wright R.I.P. Join Date: Dec 2001 Location: Schaffhausen Switzerland	Thanks again. My client will try this. A Pass 250.5 should fit the description. Regards, Allen

23rd March 2010, 10:36 AM	#13
h_a diyAudio Member Join Date: Sep 2006 Location: Graz, Austria	The Zobel is mostly needed for bipolar output stages as these are sensitive to RF captured by the speaker leads. Can't remember a mosfet amp (as the PL are) with Zobel. Have fun, Hannes

23rd March 2010, 07:59 PM	#16
Nelson Pass The one and only Join Date: Mar 2001	Actually I have given advice twice now. It's OK with me if people bring up a service subject here, as long as they don't use it to annoy me.

23rd March 2010, 11:02 PM	#17
Allen Wright R.I.P. Join Date: Dec 2001 Location: Schaffhausen Switzerland	Nelson, I never saw your second reply. Apologies. Regards, Allen