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sn
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Vacuum Lab's

Post by sn » 04 Feb 2012, 18:01

300B POWER AMP
Image

MAIN FEATURES:
- Double C core output transformers
- 6SN7 Mu follower driver configuration
- 300B power stage
- 100% Class A operating
- Anti hum circuit
- Carbon film not inductive resistors
- Military paper in oil capacitors in the signal path
- Audio grade electrolytic capacitors
- Solid core silver wiring
- 3mm chopper chassi
- Ceramic gold sockets

BENCHMARK DATA:
Input sensitivy 3V.
0,17% THD @ 1W Output.
Max Power Output (no clipping) 6,5W @ 6 & 8 Ohm
Damping factor 4

:sign http://www.flickr.com/photos/vacuumlab/

vlab.JPG
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vlab.JPG
vlab.JPG (33.65 KiB) Viewed 1178 times
PEPPERMINT TUBE PRE + PSU
DC Coupled - Bufferized Tube Line Preamplifier

Image

MAIN FEATURES:
- Stepped attenuator with 1% resistors
- Only one metal film capacitor in the signal path
- Separate PSU
- PSU electrolytic totally bypassed with MKP
- DC Coupled
- Input & Output bufferized
- Low output impedance
- Ultra fast rise time (> 1,5uS)

BENCHMARK DATA:
Vout 50V RMS @ Vin 3V RMS ; THD 2,4% 2° hrmonc prevalence.
0,17% THD with 100% 2° hrmonc @ Vout 3V RMS.
Gain: 16,6 db

NOISE:
0,6 mV linear (open)
0,2 mV A-weighted (open)
0,11 mV A-weighted (closed)

S/N RATIO:
83 db without cover
90 db covered

FREQUENCY RESPONSE:
- 0,05 db @ 20 Hz
- 0 db @ 100 Hz
- 0 db @ 1000 Hz
- 0 db @ 10.000 Hz
- 0 db @ 50.000 Hz
- 0,1 db @ 100.000 Hz

Output Impedance: 116 Ohm



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