Sidechain
viewtopic.php?t=16
GR Meter
viewtopic.php?t=15
Power Supply
viewtopic.php?t=14
Main Board
viewtopic.php?t=13
Assembly
viewtopic.php?t=19
Testing
viewtopic.php?t=20
Front Panel
viewtopic.php?t=21
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GroupDiy thread for the build
https://groupdiy.com/threads/transforme ... ead.78043/
Instructions, Schematics & Specs
Moderator: Heikki
Re: Instructions, Schematics & Specs
Schematics
Main Board -
Sidechain -
Rotary Sidechain -
Power Supply -
GR Meter -
Main Board -
Sidechain -
Rotary Sidechain -
Power Supply -
GR Meter -
Re: Instructions, Schematics & Specs
Compression Curves and THD @ 1kHz
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Output noise at max gain (19 dB), 0 dBFS = +20 dBu
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Specifications:
Input impedance ≈ 12k ohms, balanced line-to-line, *
THD < 0.25%, +20 dBu, 20-20 kHz, unity gain, no compression, **
S/N = 80 dB re +4 dBu, 22 kHz BW, unity gain, ***
Crosstalk = -60 dB, 20kHz, +4 dBu, channel-to-channel
Frequency response = 20 - 20 kHz, ±0.5 dB
Maximum gain = 17 dB or 19 dB, ****
Output impedance < 300 ohms, balanced line-to-line
* INA2137 Internal resistors are ratio matched but have ±25% absolute value
** Will heavily depend on the tubes used
*** Should be better than 80 dB unless the tubes are very noisy
**** Will depend on the tubes used and plate resistor value used. 19 dB with 5.5k plate resistors, 17 dB with 4.99k plate resistors
If the output is connected to unbalanced input do NOT ground xlr pin 3. For unbalanced connections output XLR pin 3 should be left floating, this will result 6dB loss of output level.
- 6sk7compchart.png (25.3 KiB) Viewed 11515 times
Output noise at max gain (19 dB), 0 dBFS = +20 dBu
- noise.png (54.42 KiB) Viewed 11515 times
Specifications:
Input impedance ≈ 12k ohms, balanced line-to-line, *
THD < 0.25%, +20 dBu, 20-20 kHz, unity gain, no compression, **
S/N = 80 dB re +4 dBu, 22 kHz BW, unity gain, ***
Crosstalk = -60 dB, 20kHz, +4 dBu, channel-to-channel
Frequency response = 20 - 20 kHz, ±0.5 dB
Maximum gain = 17 dB or 19 dB, ****
Output impedance < 300 ohms, balanced line-to-line
* INA2137 Internal resistors are ratio matched but have ±25% absolute value
** Will heavily depend on the tubes used
*** Should be better than 80 dB unless the tubes are very noisy
**** Will depend on the tubes used and plate resistor value used. 19 dB with 5.5k plate resistors, 17 dB with 4.99k plate resistors
If the output is connected to unbalanced input do NOT ground xlr pin 3. For unbalanced connections output XLR pin 3 should be left floating, this will result 6dB loss of output level.
Re: Instructions, Schematics & Specs
Mastering modifications