An Interesting Writeup regarding ARC upgrade
AudioGenics
Posts: 2,567
found this on Craigslist.....
We have prepared a replacement Printed Wiring Board for the SP3's power supply using a highly regulated circuitry quite similar to that used on our present products. This will considerably extend the useful service life of this product both functionally and sonically. The new power supply operates over a very wide range of input voltage (95 Volts to 135 Volts for 120 Volt units) providing regulated DC voltages to the vacuum-tube heaters as well as regulated B+ voltages. We have added automatic muting for turn-on, power interruption and turn-off.
Along with the changes to the power supply, the input and output connectors are replaced with audiophile-grade gold-plated ones. Also, coupling and bypass capacitors on the main Printed Wiring Board are changed to brand names such as Infinicap, REL-Cap and WIMA.
The sum of these changes results in a vacuum-tube stereo preamplifier (with RIAA phono) that approaches the performance of our current preamplifier product line. You will find the bass much more well-defined and extended, the mid-range smoother and more accurate, and the high frequency range extended and more accurate. For those of your who like classic tube sound, this modification takes a large step toward accuracy while preserving the things you like about vacuum tubes.
This update applies to all versions of the SP3.
We have prepared a replacement Printed Wiring Board for the SP3's power supply using a highly regulated circuitry quite similar to that used on our present products. This will considerably extend the useful service life of this product both functionally and sonically. The new power supply operates over a very wide range of input voltage (95 Volts to 135 Volts for 120 Volt units) providing regulated DC voltages to the vacuum-tube heaters as well as regulated B+ voltages. We have added automatic muting for turn-on, power interruption and turn-off.
Along with the changes to the power supply, the input and output connectors are replaced with audiophile-grade gold-plated ones. Also, coupling and bypass capacitors on the main Printed Wiring Board are changed to brand names such as Infinicap, REL-Cap and WIMA.
The sum of these changes results in a vacuum-tube stereo preamplifier (with RIAA phono) that approaches the performance of our current preamplifier product line. You will find the bass much more well-defined and extended, the mid-range smoother and more accurate, and the high frequency range extended and more accurate. For those of your who like classic tube sound, this modification takes a large step toward accuracy while preserving the things you like about vacuum tubes.
This update applies to all versions of the SP3.
Post edited by AudioGenics on
