PAS MOSFET Output Buffer Kit
$75.00
In stock
PLEASE NOTE:
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Make your new Dynakit or original Dynaco PAS preamplifier compatible with any amplifier, including solid state amps. Originally the PAS preamp was designed to work with amplifiers having a high input impedance like the Dynaco ST-35, ST-70, MKIII, MK IV and many others of this same era. The stock PAS ideally needs to see an impedance load of 470K Ohms or higher. Most solid state amps and many of today’s modern tube amps have a much lower input impedance. Trying to use a stock PAS with a low impedance amp just does not work well and just sounds terrible. Even the PAS-3X would only work well with with amps having an input impedance of 150K or higher.
Adding our MOSFET Output Buffer to your PAS will correct the impedance mismatch automatically. No switches and/or adjustments needed. Simply install the the buffer module between PC-5 Line Stage and your audio output jacks. Now you can enjoy your PAS preamplifier with most any amplifier type with uncompromised performance.
Our MOSFET Buffer kit includes the buffer circuit board, all components, hookup wire and mounting hardware. Also provided is a comprehensive (12) page installation manual with pictorials and color photos. This is an intermediate level kit which requires competent soldering experience.
Please note: The additional current draw of our MOSFET Buffer is only 3.67 mA (DC) which will not present any loading issues for your original PA-211 transformer although we do strongly recommend adding a 1/4 amp slo-blow fuse to the 120 volt supply. If you suspect your aging (50) + year old power transformer is not up to the task…Then please check out our new improved Dynaco PA-211-B. replacement transformer.
Also: Our MOSFET Buffer is intended for installation in a working PAS preamplifier only….It will not miraculously correct pre-existing problems with your PAS unit. One final note…Our MOSFET Buffer circuit design incorporates DC blocking capacitors which were not provided with the original Dynaco PAS-2/3 preamps….Only with the later PAS-3X version.