Jungson JA-2 preamp upgrade with Burson Discrete V4 opamp

Published on

wpadmin
February 23, 2011

Post Info

Feedbacks - V4 SS Opamp
Jungson Ja-2

Attached is a few shots of both the dual and single discrete opamps in my Jungson Ja-2 pre amplifier.
The change in sound wasn’t subtle. This was a relatively straight forward exercise.
They are slotted nicely in some sockets installed for opamp rolling purposes.
An excellent upgrade from the OPA2604 and NE5534’s.
They match nicely with the Siemens ECC801s tubes.

Kind regards
Peter

The System

Listening with

Jungson JA-2

Burson

Burson V4 Opamp · Discrete opamp (single / dual) · discontinued

Supply voltage: ±5 V to ±20 V (absolute maximum)
Gain-bandwidth product: 50 MHz (at 100 kHz)
Dual or single: dual and single (this post uses the dual and the single)
Package: dual 40 mm × 16 mm × 20 mm; single 40 mm × 16 mm × 14 mm; 8-pin

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Also in the system

NE5534 · Operational amplifier

Operating voltage: ±5 V to ±15 V (recommended)
Supply voltage: ±22 V (absolute maximum)
Unity-gain bandwidth: 10 MHz typ
Dual or single: single
Package: SOIC-8; PDIP-8
Supply current: 4 mA typ / 8 mA max

^[3]

OPA2604 · Dual operational amplifier

Supply voltage: ±4.5 V to ±24 V (recommended); ±25 V absolute maximum
Gain-bandwidth product: 20 MHz typ (G = 100)
Dual or single: dual
Package: SOIC-8; PDIP-8

^[4]

Specs from manufacturer data unless a source below says otherwise. “calc.” values are worked out from those figures (V = √(P × R); 110 dB SPL used as a loud reference level). Gear listed without specs is not in our spec library yet.