Pioneer Spec-1 Preamp

snow

For sale is a Pioneer Spec-1 Preamp in good working and cosmetic shape, the only issue I know of is the little orange power bulb is burned out and needs replaced which is common on these, I have owned several of these over the years and have never had one with a working power bulb

These seem to sell recently for anywhere from $500.00 to $1000.00 on Ebay depending on condition with the average price most likely around $700.00

Anyways $400.00 + shipping. You will never see one this nice this cheap .

My area code is 99707 for those wanting to guesstimate a shipping cost figure a box 25 X X 13 X 25 weighing 32 lbs or so to your zip code. USPS Parcel select or Priority mail your choice if choosing parcel select it can take 3 weeks to arrive from my location.

dromunds

I bought a Spec 2 amp new, and I really liked it, kicked myself continually since I sold it. Never had the preamp as I had an SAE preamp at the time but these Spec preamps were known to be top-notch. GLWS.

snow

dromunds wrote: »

I bought a Spec 2 amp new, and I really liked it, kicked myself continually since I sold it. Never had the preamp as I had an SAE preamp at the time but these Spec preamps were known to be top-notch. GLWS.

Thanks these really are very nice preamps, most likely the best Pioneer ever made with class A parts throughout a very nice Alps volume pot etc, this one is dead quiet too with no coloration of any kind.


Come fall/winter it will sell for double the asking price on Ebay so it wont hurt my feelings much if it doesnt sell here :cheesygrin:



REGARDS SNOW

snow

Technical info for those that need to know :biggrin:


Circuit-wise, the SPEC-1 is an all-Class A SEPP design : phono, flat amp, tone controls and output, three stages every time.

The flat amp has a PNP differential amplifier with 3-stage DC class-A SEPP circuit, with a ±48V split power supply and 100% DC negative feedback in the first-stage for DC stability.
Other ±48V supplies feed input and output buffers to raise input and lower output impedances.

The all-important phono stage is also fed by two ±48V supplies to ensure a high overload level of 500mV at 1Khz.

The phono 2 input has a distinct smaller 4-gang input level to adjust its sensitivity between 2,5mV and 10mV (or 0dB to -12dB) ; its level up to -6dB is adjusted by and NFb loop and by the output attenuator until -12dB.

The volume attenuator is a 4x 50kOhm / 22-steps 4-gang ALPS (as usual) with an added three-position muting switch for 0dB, -15dB and -30dB input levels.
A relay mutes the output when the SPEC-1 is switched on or off.

Tone controls are of the NF type, allowing between their MAIN and SUB section 5929 tone altering possibilities.

Inside are all low-noise PNP/NPN transistors, micron-tolerance circuits and resistors