Rare opportunity to purchase a really nice vintage Grado rig from the early 1990s featuring two rare Grado components with great synergy.
1. Very rare, very nice Joseph Grado Signature Products HPA-2 Headphone Amplifier with even more rare HP P/S-1 Power Supply.
2. Grado Labs Black 325 Headphones with pink transitional drivers.
Both items are in very good used condition with minimal signs of use and most lettering intact.
This rig sound fantastic!
JOSEPH GRADO SIGNATURE PRODUCTS HPA-2 HEADPHONE AMPLIFIER WITH P/S-1 POWER SUPPLY
Grado produced these handmade amplifier in very limited quantities due to the high cost of the components selected by Joseph Grado.
They reportedly produced 150 units of the initial HPA-1 amplifier followed by only 50 units of the slightly improved (better shielding) HPA-2.
The optional HP P/S-1 power supply was sold in small numbers as it was expensive ($125 in 1993!) and the amplifier worked well with 9V batteries.
This unit is switchable between 9V batteries or the included power supply. The rear battery compartment includes space to store a spare set of batteries.
The HPA 1/2 amplifierdesign was executed by the legendary Sydney Smith, who designed the original Marantz High Fidelity products.
Joseph Grado selected or designed all the individual components. The internal wiring and the umbilical cable to the HP P/S-1 power supply are all matching Joseph Grado Signature Ultra-Wide Bandwidth Reference cable.
Each HPA-2 was discrete wired and hand assembled byTom Cadawas the famous Marantz QC trouble shooter.
Joseph Grado personally did the final assembly and testing of each unit.
The amplifier was expensive. $795 in 1993. That's $200 more than the most expensive HP-1000 headphone, the HP-1 ($595).
The optional power supply cost $125 extra.
The amplifier proved too expensive to produce, even at that price. Like the HP-1000 production stopped after the initial units were built or parts used up...
GRADO LABS BLACK 325
In 1993 Grado introduced SR125, SR225 and SR325 to replace the also rare SR100/200/300. (The SR300 may be the most rare Grado of all!)
The SR125 and SR225 used the same plastic cups as the earlier SR 100/200/300. The SR325, however, was radical in that it used much larger metal outer cups similar in size to the HP-1000 cups.
This was Grados first attempt to create an audiophile/professional replacement for the HP-1000, which were no longer available.
These were John Grados first TOTL headphones and pre-date the later RS1/RS2.
In fact the RS2 copied the original 325 outer cup size.
I prefer to sell these without pads. The new owner should get some TTVJ Flats! I can include a pair of used bowls if requested.
Edited by parbaked - 9/29/13 at 8:48am