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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
Provenance & Background:
This matched reference stack (Premier 7B Preamp and Premier 8A 275W Monoblocks) was originally part of a high-end system in Ljubljana, Slovenia, curated by Franc Kuzma. The units have been kept in dry, climate-controlled storage for approximately 20 years and have recently undergone a controlled 48-hour reactivation and stabilization protocol.
Technical Condition:
The amplifiers are fully operational and have been verified for stability:
Technical data:
Tube Specifications & NOS Status:
The system features an exceptional tube complement:
Cosmetics & Aesthetics:
The champagne-gold anodized faceplates are in excellent/near-mint condition with no pitting or oxidation. The brushed texture remains deep and luxurious. Please see the photos for condition details.
Logistics:
Located in Ljubljana, Slovenia. Total weight is approximately 110kg. Original boxes are not available. Due to the weight and fragile nature of the glass/transformers, professional palletized crating can be arranged for EU-wide shipping at the buyer's expense. Local pickup (and live demo) is highly recommended.
Video Proof of Life:
View the units in operation here: https://youtu.be/FHfo5YwGGto
For serious buyers:
I can also provide direct livestream via discord, youtube or twitch for a due dilligence inspection before commiting. Bill of sale availlable. Price is negotiable within reason.
This matched reference stack (Premier 7B Preamp and Premier 8A 275W Monoblocks) was originally part of a high-end system in Ljubljana, Slovenia, curated by Franc Kuzma. The units have been kept in dry, climate-controlled storage for approximately 20 years and have recently undergone a controlled 48-hour reactivation and stabilization protocol.
Technical Condition:
The amplifiers are fully operational and have been verified for stability:
- Capacitors: Power supply capacitors have been successfully re-formed and are stable under high-current load.
- Performance: Verified symmetrical audio output into a 6-ohm and 4-ohm load. Both monoblocks track perfectly at high volumes with zero drift once at thermal equilibrium.
- Bias Logic: The electronic protection and bias circuits are fully responsive. (Note: One indicator LED on the left unit is currently dormant, though the associated tube is fully functional and sonically matched to its partners).
Technical data:
- Electronic Protection Circuitry: Late-production "8A" specification featuring integrated fault-sensing and reset functions to protect output transformers. Each monoblock is capable of delivering 275 Watts of power.
- Dual-Monaural Architecture: Premier 7B features two completely independent chassis/circuits for zero crosstalk and maximum soundstage depth.
- High-Current Capability: Optimized for difficult electrostatic loads (Sound-Lab, Martin Logan) with a verified stable idle into low-impedance dips.
- Direct-Coupled Inputs: Minimizes signal coloration and ensures the famous Conrad-Johnson "Liquid" midrange transparency.
- Regulated Power Supplies: Discrete voltage regulation for all stages to ensure low noise-floor even with high-sensitivity speakers.
- NOS Stability: Circuit verified for use with 2004 New Old Stock (NOS) 6550A lamps for superior micro-dynamics.
- Export edition: Factory tuned for European market 240V 50Hz.
Tube Specifications & NOS Status:
The system features an exceptional tube complement:
- Main Set: Fitted with a matched set of New Old Stock (NOS) 6550A lamps installed in 2004 before being stored. These have extremely low hours (practically zero beside recent testing) and hold a stable bias.
- Archival Spares: Included in the sale is a full second set of the original 1990s factory-supplied 6550A lamps from GE. These are provided as a verified backup/provenance set and have low to medium hours.
Cosmetics & Aesthetics:
The champagne-gold anodized faceplates are in excellent/near-mint condition with no pitting or oxidation. The brushed texture remains deep and luxurious. Please see the photos for condition details.
Logistics:
Located in Ljubljana, Slovenia. Total weight is approximately 110kg. Original boxes are not available. Due to the weight and fragile nature of the glass/transformers, professional palletized crating can be arranged for EU-wide shipping at the buyer's expense. Local pickup (and live demo) is highly recommended.
Video Proof of Life:
View the units in operation here: https://youtu.be/FHfo5YwGGto
For serious buyers:
I can also provide direct livestream via discord, youtube or twitch for a due dilligence inspection before commiting. Bill of sale availlable. Price is negotiable within reason.
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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