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Conrad Johnson Premier 7B & Premier 8A Monoblocks / Matched Set / NOS 6550A / Kuzma-Legacy
Product information
- Product category
- Tube-Pre-/Powerampcomb.
- Manufacturer
- Conrad Johnson
- Function
- flawless
- Age
- 30 years According to imprint
- Usage state
- second-hand
- Appearance
- as good as new
- Accessories
- complete without original box
- Color
- Champagne gold
- Original price
- 24,500.00 €
- Price
- 15,500.00 €
- More information
- http://www.conradjohnson.com/
- Serial number
- 5911170 5911169 2121195
Description
One of the finest reference amplification systems Conrad-Johnson ever produced — offered for the first time after two decades in private storage.
This matched stack — Premier 7B line preamplifier and Premier 8A 275W monoblocks — formed the centrepiece of a reference system curated by Franc Kuzma, founder of Kuzma Audio and one of Europe's most respected turntable designers. Kept in dry, climate-controlled storage for ~20 years, both units have recently completed a controlled 48-hour reactivation and stabilization protocol.
Technical Condition:
Technical Highlights:
Tubes:
Cosmetics: Champagne-gold anodized faceplates, excellent/near-mint. No pitting or oxidation.
Included: Premier 7B (dual-chassis), two Premier 8A monoblocks, matched NOS tube set (installed), GE factory spare set, bill of sale. Original boxes not available.
Logistics:
Ljubljana, Slovenia. ~110kg total (preamp ~15kg, each monoblock ~45kg). Palletized EU freight available at buyer's expense (~€200–400). Local pickup strongly recommended — live demonstration by appointment.
Video proof of life: Watch the bias demonstration here
Serious buyers: Live inspection via Discord, YouTube or Twitch available before committing. Bill of sale provided. Price negotiable (within reason).
SYSTEM SYNERGY: Also available from the same Kuzma collection: the ultra-rare Expressive Technologies SU-1 MC Step-Up Transformer. See my other listings.
This matched stack — Premier 7B line preamplifier and Premier 8A 275W monoblocks — formed the centrepiece of a reference system curated by Franc Kuzma, founder of Kuzma Audio and one of Europe's most respected turntable designers. Kept in dry, climate-controlled storage for ~20 years, both units have recently completed a controlled 48-hour reactivation and stabilization protocol.
Technical Condition:
- Capacitors: Power supply capacitors successfully re-formed and stable under high-current load.
- Output: Verified symmetrical audio output into 6-ohm and 4-ohm loads. Both monoblocks track perfectly at high volumes with zero drift at thermal equilibrium.
- Bias & Protection: All circuits fully responsive. Late-production 8A spec with integrated fault-sensing and transformer protection.
- Known issue: One indicator LED on the left monoblock is dormant. The associated tube is fully functional and sonically matched. Cosmetic only.
Technical Highlights:
- 275W per monoblock — late-production Premier 8A specification.
- Dual-monaural Premier 7B: Four fully independent chassis — two signal stages and two separate power supplies — for zero crosstalk and maximum soundstage depth.
- Electrostatic-capable: Verified stable into low-impedance dips (Sound-Lab, Martin Logan).
- Regulated power supplies in all stages — low noise floor even with high-sensitivity speakers.
- Export spec: Factory-tuned for 240V / 50Hz.
Tubes:
- Main set: Matched NOS 6550A tubes installed new in 2004 prior to storage. Practically zero hours aside from recent testing. Bias stable.
- Archival spare set: Original 1990s factory GE 6550A tubes, low-to-medium hours — included as a verified provenance backup.
Cosmetics: Champagne-gold anodized faceplates, excellent/near-mint. No pitting or oxidation.
Included: Premier 7B (dual-chassis), two Premier 8A monoblocks, matched NOS tube set (installed), GE factory spare set, bill of sale. Original boxes not available.
Logistics:
Ljubljana, Slovenia. ~110kg total (preamp ~15kg, each monoblock ~45kg). Palletized EU freight available at buyer's expense (~€200–400). Local pickup strongly recommended — live demonstration by appointment.
Video proof of life: Watch the bias demonstration here
Serious buyers: Live inspection via Discord, YouTube or Twitch available before committing. Bill of sale provided. Price negotiable (within reason).
SYSTEM SYNERGY: Also available from the same Kuzma collection: the ultra-rare Expressive Technologies SU-1 MC Step-Up Transformer. See my other listings.
Seller:
- Shipping from Slovenia (1000)
- Purchaser pays shipping costs
- EU wide shipping
Payment methods
- Cash upon collection
- Bank transfer
Advert ID
358318065
Advert time period- Start:
- 23.02.2026 - 11:36
- End:
- 24.04.2026 - 11:36
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