I have to agree that 75k input impedance is the right one.
-----Original Message-----
From: Nelson Pass
To: junpablo
Sent: Wed, May 25, 2011 5:32 pm
Subject: Re: Vintage Threshold 4000 Class A amp:/ Need specifications/ Input Impedance:
I looked at the schematic, and a quick calculation shows 75K. The 15K value is
in error - the 10K value he is looking at has been bootstrapped to a 70K value. and
is added to the 4.75K input resistor before it.
np
NOW IT'S TIME TO FIND A TUBE PRE-AMP THAT WILL SUITED IN MY BUDGET AND IN A TIMELY MANNER.THANKS TO ALL PESCOLAR.
-----Original Message-----
From: Nelson Pass
To: junpablo
Sent: Wed, May 25, 2011 5:32 pm
Subject: Re: Vintage Threshold 4000 Class A amp:/ Need specifications/ Input Impedance:
I looked at the schematic, and a quick calculation shows 75K. The 15K value is
in error - the 10K value he is looking at has been bootstrapped to a 70K value. and
is added to the 4.75K input resistor before it.
np
NOW IT'S TIME TO FIND A TUBE PRE-AMP THAT WILL SUITED IN MY BUDGET AND IN A TIMELY MANNER.THANKS TO ALL PESCOLAR.