Fosi Audio V3 MonovsOldchen (Laochen) EL34-B
A detailed side-by-side comparison of the Fosi Audio V3 Mono and Oldchen (Laochen) EL34-B — two popular amplifiers in the Chinese HiFi space.
Specifications
Spec
Fosi Audio V3 Mono
Oldchen (Laochen) EL34-B
Class
D
A
Chipset
TI TPA3255 (with PFFB)
—
Topology
Monoblock
Single Ended Triode (SET)
Power
240W @ 4Ω (48V/5A supply)
10W x 2
THD / SINAD
-120 dB (SINAD via XLR)
—
Inputs
RCA, XLR / ¼” TRS
—
Features
Auto-Standby, 12V Trigger, Gain Switch (25dB/31dB)
—
Tubes
—
EL34 x2, 6N9P x2, 5U4G x1
Wiring
—
Point-to-Point (Hardwired)
Remote Control
✗
✗
Tube Stage
✗
✓
Price (estimated)
Price
~$131
~$170
Difference
~$39.00 cheaper (Fosi Audio V3 Mono)
Things to Know
Fosi Audio V3 Mono
- ⚠Chassis gets significantly warm due to the compact thermal design coupled with high power density.
- ⚠Auto-standby feature produces a mechanical 'click' that some users find audible in quiet rooms.
- ⚠Requires two separate power bricks (or a specialized splitter) for a stereo pair, adding cable clutter.
Oldchen (Laochen) EL34-B
- ⚠The '5U4G' rectifier is often wired in hybrid mode with silicon diodes, which purists dislike.
- ⚠Transformers run very hot, suggesting they are pushed near their saturation limits.
- ⚠Stock Chinese EL34 tubes can sound harsh compared to budget re-issues like Mullard or JJ.
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