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Dynaco PAT-4 |
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Dynaco's specifications: Frequency Response: High level inputs: ±0,5 dB from 10 Hz to 100 KHz Low level inputs: ±1 dB from 20 Hz to 20 KHz Distortion at rated 2 volt output: THD less than 0,05% (-66 dB) 20 Hz to 20 KHz IM less than 0,05% (-66 dB) with any combination of test frequencies Hum and Noise: Phono: 70 dB below a 10 mV reference signal Line: 85 dB below a 0,5 volt signal Modification in order to improve performance: (added 2007-05-13) Replace Q3 with BC549C Replace Q4 with BC141 Replace all resistors > 47 k with metal film type After this, THD is about 6 dB lower, no other specs are changed. |
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Tested data: |
THD at 1 kHz - Line input
-76 dB = 0,016 % |
IMD - Line input -65 dB =
0,056 % |
DFD - Line input -78 dB
= 0,013 % |
Frequency response - Line input |
S/N - Line input A-filter,
-90dB |
Tone control range  |
THD at 1 kHz - Phono (RIAA) input
-78 dB = 0,013 % |
IMD - Phono (RIAA) input
-67 dB = 0,045 % |
DFD - Phono (RIAA) input
-77 dB = 0,014 % |
Frequency response - Phono (RIAA) input |
S/N - Phono (RIAA) input
A-filter |
